ccna真题

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思科认证CCNA认证试题和答案中文版

思科认证CCNA认证试题和答案中文版思科认证CCNA认证试题和答案中文版想要获得思科认证，首先要参加由思科推荐并授权的培训中心(Cisco Training Partner，简称CTP)所开设的培训课程。

完成学业后再到由全球考试机构Sylvan Prometric授权的.考试中心参加由思科指定的科目的认证考试。

通过指定的系列科目考试后，学员就可以获得相应分支系列等级的资格认证。

下面是店铺为大家搜集的相关试题，供大家参考练习。

16、路由器A串口0配置如下interface serial0link-protocol pppppp pap local-user huawei password simple quidwayip address 2.2.2.1 255.0.0.0路由器B串口及全局配置如下local-user huawei service-type ppp password simple quidway!interface serial0link-protocol pppppp authentication-mode papip address 2.2.2.2 255.0.0.0当两台路由器串口0相连时，两台路由器是否可以连接到对端()(A) 能(B) 不能答案：A17、关于千兆以太网，以下说法正确的是( )(A) IEEE802.3ab定义了千兆以太网(B) 在同一冲突域中，千兆以太网不允许中继器的互连(C) IEEE802.3z专门定义了千兆以太网在双绞线上的传输标准(D) 千兆以太网支持网络速率的自适应，可以与快速以太网自动协商传输速率答案：AB参考知识点：华为3com认证教材第一册3-8页18、高层的协议将数据传递到网络层后，形成( )，而后传送到数据链路层(A) 数据帧(B) 信元(C) 数据包(D) 数据段答案：C参考知识点：华为3com认证教材第一册1-20页19、在路由器上配置帧中继静态map必须指定( )参数(A) 本地的DLCI(B) 对端的DLCI(C) 本地的协议地址(D) 对端的协议地址答案：AD20、路由器的主要性能指标不包括( )(A) 延迟(B) 流通量(C) 帧丢失率(D) 语音数据压缩比答案：D【思科认证CCNA认证试题和答案中文版】。

思科认证CCNA认证试题与答案中文版

(A) 224. 0. 0.5 (B) 127. 32. 5. 62 (0202. 112.5.0 (D) 162. 111. 111. Ill
答案：D 注释:这个题目不是太严谨,应该加上子网掩码. A:224. 0. 0. 5 是多播地址 B: 127. 0.0. 0 保留作为测试使用 C:网络地址 26、设置主接口由 up 转 down 后延迟 30 秒切换到备份接口，主接口由 down 转 up 后 60 秒钟切换回主接口的配置为()
忍一句，息一怒，饶一着，退一步。——《增广贤文》
人之为学，不日进则日退，独学无友，则孤陋而难成；久处一方，则习染而不自觉。——《顾炎武》
答案：D 注释:255. 255. 255. 255 是全网广播,DHCP 客户端发送全网广播来查找 DHCP 服务器. 24、下而有关 NAT 叙述正确的是() (A) NAT 是英文“地址转换”的缩写，又称地址翻译 (B) XAT 用来实现私有地址与公用网络地址之间的转换 (C) 当内部网络的主机访问外部网络的时候，一定不需要 NAT (D) 地址转换的提出为解决 IP 地址紧张的问题提供了一个有效途径答案:ABD 25、以下属于正确的主机的 IP 地址的是()
(A) arp-a (B) traceroute (C) routeprint (D) displayiprouting-table
答案：D 23、 D0. 0. 0 (B) 10. 0. 0. 1 (0127. 0. 0. 1 (D)255. 255. 255. 255
192. 168. 1. 1
答案：D 注释:PC 的'默认网关要指向路由器的以太网口的 IP 地址. 28、 ISDNB 信道速率是()
(A) 16kbps (B) 64kbps

CCNA综合试卷

CCNA集训队综合试卷一、选择题( 40分)1．交换机进行数据转发时，依据的是（）。

（A）IP地址（B）MAC地址（C）主机名称（D）网络标识2．对交换机配置时，应将配置线缆插入（）。

（A）Ethernet口（B）AUX口（C）Serial口（D）Console口3．下列哪个服务提供域名到IP地址的解析服务（）。

A．DNS B．DHCP C．WWW D．SMTP4．哪种路由选择协议使用最短路径优先算法?( )A. 距离向量B. 链路状态C. 混合D. 以上都不对5．不支持可变长子网掩码的路由协议是( )A. RIP v1B. RIP v2C. OSPFD. IS-IS 6．Cisco的专用协议有( )A. RIPB. BGPC. EIGRPD. OSPF7．默认时，管理距离大于90的有( ) （本题多选）A. RIPB. IGRPC. OSPFD. EIGRP 8．路由协议存在路由自环问题的是( )A. RIPB. BGPC. OSPFD. IS-IS9．MAC地址与IP地址的长度分别是（）。

（A）48位、48位（B）32位、32位（C）48位、32位（D）32位、48位10．以下网络互连设备中，属于物理层的设备是（）。

（A）集线器（B）交换机（C）路由器（D）网关11．下列IP地址属于标准B类IP地址的是（）（A）172.19.3.245/24 （B）190.168.12.7/16 （C）120.10.1.1/16 （D）10.0.0.1/16 12．以太网交换机组网中有环路出现也能正常工作，则是由于运行了（）协议。

（A）801.z （B）802.3 （C）Trunk （D）Spanning Tree13．对IP地址为192.168.2.1的主机不停发送数据包的命令ping命令是（）。

（A）ping 192.168.2.1 –n （B）ping 192.168.2.1 -i（C）ping 192.168.2.1 –t （D）ping 192.168.2.1 -a14．要查看交换机端口加入VLAN的情况，可以通过（）命令来查看（A）show vlan （B）show running-config （C）show vlan.dat （D）show interface vlan 15．下列属于路由表的产生方式的是（）。

思科题目

CCNACCNA11章节考试题之01《生活在以网络为中心的世界》1、在主要使用文本相互通信的两人或多人之间，他们使用的哪种通信形式属于基于文本的实时通信？A.网络日志B.维基C.即时消息D.播客E.协作工具2、哪种网络为客户提供对企业数据（如库存、部件列表和订单）的有限访问？A.内部网B.外联网C.网际网络D.Internet3、出于管理数据的目的，需要使用什么来权衡通信的重要性及其特征？A.网络管理B.网络流量C.QoS策略D.网络评估4、对网络通信采取哪些处理后才能使服务质量策略正常发挥作用？（选择两项）A.根据服务质量要求对通信分类。

B.对应用程序数据的每个分类分配优先级。

C.始终对Web通信分配高优先级处理队列。

D.始终对数字电影分配高优先级处理队列。

E.始终对电子邮件通信分配低优先级队列。

5、网络体系结构有哪两个部分？（选择两项）A.构成以人为本网络的人B.通过网络传输消息的编程服务和协议C.通过网络传输的数据D.支持网络通信的技术E.运营和维护数据网络的企业6、在当初开发Internet时，放弃面向连接的电路交换技术出于哪三个原因？（选三项）A.电路交换技术要求将单个消息划分为包含编址信息的多个消息。

B.早期的电路交换网络在电路出现故障时不能自动建立备用链路。

C.电路交换技术要求即使两个位置之间当前并未传输数据，也必须在网络端点之间建立开放电路。

D.通过面向连接的电路交换网络传输消息无法保证质量和一致性。

E.建立多路并发开放电路获得容错能力成本高昂。

7、开发Internet时使用数据包交换无连接数据通信技术出于哪三个原因？（选三项）A.它能快速适应数据传输设施的丢失。

B.它能有效利用网络基础架构传输数据。

C.数据包可同时通过网络采取多条路径传输。

D.支持按建立连接的时间收取网络使用费用。

E.传输数据之前需要在源设备和目的设备之间建立数据电路。

8、QoS在融合网络中的作用是什么?A.确保丢弃高于可用带宽水平的所有通信B.确定网络中不同通信的传输优先级C.针对所有网络通信确定精确的优先级D.允许网络中的其它组织共享未使用的带宽9、将左侧的选项和右侧的对象连线，使网络体系结构的特征与其定义相匹配。

CCNA第四学期期末考试全真试题及答案(第一套)

1下列哪种类型的网络攻击是利用被入侵的系统中的漏洞在网络中自我传播？B病毒蠕虫特洛伊木马中间人2请参见图示。

有一个FTP 请求数据包需要发往IP 地址为172.16.1.5 的FTP 服务器。

Router1 的S0/0/0 接口收到该请求数据包后，会以何种方式处理？C路由器认定传入数据包与access-list 201 permit ip any any 命令创建的语句匹配，从而允许数据包进入路由器。

因为access-list 101 permit ip any any 命令没有创建任何语句，所以路由器会达到ACL 101 的尾部而找不到匹配的条件，从而丢弃该数据包。

路由器认定传入数据包与access-list 101 permit ip any 172.16.1.0 0.0.0.255 命令创建的语句匹配，从而忽略ACL 101 的其余的语句，允许数据包进入路由器。

路由器会认定传入数据包与命令access-list 201 deny icmp172.16.1.0 0.0.0.255 any 创建的语句匹配，然后继续将该数据包与ACL 201 中剩余的语句比对，以确保后续语句均未禁止FTP，然后路由器将丢弃该数据包。

3管理员正在使用RIPng 和双协议栈技术为一路由器配置IPv6 和IPv4，他在输入IPv4 路由时收到一条错误消息。

可能是什么原因导致出现错误消息？AIPv4 与RIPng 不兼容RIPng 与双协议栈技术不兼容。

路由器接口的地址配置错误。

在同一接口同时配置IPv4 和IPv6 时，所有IPv4 地址均被禁用，以支持新的技术。

4帧中继网络中所用的本地管理接口(LMI) 提供哪两项功能？（选择两项。

）AE流量控制错误通知拥塞通知映射DLCI 至网络地址发送keepalive 数据包以检验PVC 的工作情况5如果不以纯文本格式发送身份验证信息，在Cisco 和非Cisco 路由器之间建立链路连接时，应使用以下哪种第 2 层协议和身份验证的组合？DHDLC 与PAPHDLC 与CHAPPPP 与PAPPPP 与CHAP6服务提供商自何处开始对客户的WAN 连接负责？C本地环路路由器上的DTE 电缆分界点非军事区7请参见图示。

ccna真题

CCNA测试真题1要求公司进行IP子网规划，内网网段是192.168.1.0/24，进行一下子网划分router1下面有120个PCrouter2下面有60个PCrouter3下面有28个PCrouter4下面有12个PC要求PC都能自动获得地址，并且只有router0是DHCP服务器，DNS地址是10.10.10.100 router0，router1,router2,router3,router4的互联地址也在192.168.1.0/24这个子网。

解决方案：根据题目的要求，进行子网划分router1是192.168.1.0/25网关地址192.168.1.1router2是192.168.1.128/26网关地址192.168.1.129router3是192.168.1.192/27网关地址192.168.1.193router4是192.168.1.224/28网关地址192.168.1.225直连地址：router0*router1 :地址192.168.1.241/30 *192.168.1.242/30router0*router2 :地址192.168.1.245/30 *192.168.1.246/30router0*router3 :地址192.168.1.249/30 *192.168.1.250/30router0*router4 :地址192.168.1.253/30 *192.168.1.254/30配置：Router0(config)#int s0/3/0Router0(config-if)#no shRouter0(config-if)#ip add 192.168.1.241 255.255.255.252Router0(config-if)#int s0/3/1Router0(config-if)#no shRouter0(config-if)#ip add 192.168.1.245 255.255.255.252Router0(config-if)#int s0/2/0Router0(config-if)#no shRouter0(config-if)#ip add 192.168.1.249 255.255.255.252Router0(config-if)#int s0/2/1Router0(config-if)#no shRouter0(config-if)#ip add 192.168.1.253 255.255.255.252Router1(config)#int g0/0Router1(config-if)#no shRouter1(config-if)#ip add 192.168.1.1 255.255.255.128Router1(config-if)#int s0/3/0Router1(config-if)#no shRouter1(config-if)#ip add 192.168.1.242 255.255.255.252Router2(config)#int g0/0Router2(config-if)#no shRouter2(config-if)#ip add 192.168.1.129 255.255.255.192 Router2(config)#int s0/3/0Router2(config-if)#no shRouter2(config-if)#ip add 192.168.1.246 255.255.255.252Router3(config)#int g0/0Router3(config-if)#no shRouter3(config-if)#ip add 192.168.1.193 255.255.255.224 Router3(config-if)#int s0/3/0Router3(config-if)#no shRouter3(config-if)#ip add 192.168.1.250 255.255.255.252Router4(config-if)#int g0/0Router4(config-if)#ip add 192.168.1.225 255.255.255.240 Router4(config-if)#no shRouter4(config-if)#int s0/3/0Router4(config-if)#ip add 192.168.1.254 255.255.255.252 Router4(config-if)#no sh配置rip路由,在这5个路由器上都去宣告RIP路由，router ripversion 2network 192.168.1.0no auto-summary保证网络能进行畅通接下来在router0上配置DHCP服务器Router0(config)#ip dhcp pool router1Router0(dhcp-config)#network 192.168.1.0 255.255.255.128 Router0(dhcp-config)#default-router 192.168.1.1Router0(dhcp-config)#dns-server 10.10.10.100Router0(dhcp-config)#exRouter0(config)#ip dhcp excluded-address 192.168.1.1Router0(config)#ip dhcp pool router2Router0(dhcp-config)#network 192.168.1.128 255.255.255.192 Router0(dhcp-config)#default-router 192.168.1.129Router0(dhcp-config)#dns-server 10.10.10.100Router0(dhcp-config)#exRouter0(config)#ip dhcp excluded-address 192.168.1.129Router0(config)#ip dhcp excluded-address 192.168.1.132//R2下面连接的服务器地址Router0(config)#ip dhcp pool router3Router0(dhcp-config)#network 192.168.1.192 255.255.255.224Router0(dhcp-config)#default-router 192.168.1.193Router0(dhcp-config)#dns-server 10.10.10.100Router0(dhcp-config)#exRouter0(config)#ip dhcp excluded-address 192.168.1.193Router0(config)#ip dhcp pool router4Router0(dhcp-config)#network 192.168.1.224 255.255.255.240Router0(dhcp-config)#default-router 192.168.1.225Router0(dhcp-config)#dns-server 10.10.10.100Router0(dhcp-config)#exRouter0(config)#ip dhcp excluded-address 192.168.1.225接下在router1--router4上配置DHCP的中继Router1(config)#int g0/0Router1(config-if)#ip helper-address 192.168.1.241Router2(config-router)#int g0/0Router2(config-if)#ip helper-address 192.168.1.245Router3(config)#int g0/0Router3(config-if)#ip helper-address 192.168.1.249Router4(config)#int g0/0Router4(config-if)#ip helper-address 192.168.1.2532要求对router0进行密码恢复解决：进行密码恢复，把router0断电重启，重启的过程中按ctrl break rommon 1 > confreg 0x2142rommon 2 > bootContinue with configuration dialog? [yes/no]: nRouter>enRouter#copy startup-config running-configDestination filename [running-config]?Center#conf tCenter(config)#no enable passwordCenter(config)#no enable secretCenter(config)#config-register 0x2102Center(config)#do wr3要求对router2进行IOS的恢复解决：首先要给服务器去配置一个临时地址1.1.1.1/24在配置tftpdnld的时候，给路由器去设置临时地址是1.1.1.100/24发现模拟器上的Server上不存在29系列的IOS，所以先让服务器去复制一个IOS，去router1上复制。

CCNA中英文试题两套

这是我学习过程中遇见的ccna试题，中文一份，英文一份，很经典呀。

1 技术人员需要为某幢已经布设有线以太网络的大厦提供无线连接。

哪三个因素会影响需要的接入点数目？（选择三项。

）大厦的规模大厦中实体内墙的数目多个办公室中有微波炉无线网络中使用的加密方法Windows 和Appletalk 操作系统的同时使用AP 中短波或红外线的使用2 下列关于无线网桥的陈述，哪一项是正确的？通过无线链路连接两个网络连接无线局域网的固定设备允许无线客户端连接到有线网络增强无线信号的强度3 接入点默认使用哪一类身份验证？开放式PSKWEPEAP4请参见图示。

在Linksys 集成路由器的Wireless 菜单选项中，Network Mode 选项Mixed 是什么意思？路由器支持加密和身份验证。

路由器支持有线和无线两种连接。

路由器支持802.11b、802.11g 和802.11n 设备。

路由器支持通过红外和无线电射频连接。

5 接入点可以使用哪两种身份验证方法？（选择两项。

）WEPWPAEAPASCII预共享密钥6 哪项接入点功能允许网络管理员定义可以进入无线网络的数据类型？加密黑客攻击拦截通信过滤MAC 地址过滤身份验证7 下列关于服务集标识符(SSID) 的陈述中，哪两个是正确的？（选择两项。

）标识无线设备所属的WLAN是一个包含32 个字符的字符串，不区分大小写负责确定信号强度同一WLAN 中的所有无线设备必须具有相同的SSID用于加密通过无线网络发送的数据8请参见图示。

在Linksys 集成路由器的Wireless 菜单中，哪个配置选项可用于让附近的客户端知道接入点的存在。

Network ModeNetwork Name (SSID)Radio BandWide ChannelStandard ChannelSSID Broadcast9 下列哪个术语准确描述了为防止黑客读取截取到的数据而进行的无线数据编码？地址过滤身份验证广播加密密码短语编码10 两种WEP 密钥长度分别是多少？（选择两项。

2023年CCNA考试真题

2023年CCNA考试真题2023年CCNA考试正式开考啦！本次考试涉及网络技术的基础知识，将对考生的技术水平进行全面考察。

下面是本次考试的真题，希望能够帮助考生更好地复习。

【第一部分：选择题】（共10题，每题2分，共计20分）1. OSI模型中，位于网络层的协议是：A. TCPB. IPC. HTTPD. UDP2. 下面哪个命令可以查看路由表信息：A. pingB. tracertC. ipconfigD. route print3. 在IP地址192.168.0.1/24中，/24表示什么意思：A. 子网掩码B. 路由器IP地址C. 网络IDD. 主机ID4. 下面哪个协议可以实现主机与交换机之间的通信：A. BGPB. ARPC. MPLSD. SNMP5. 下面哪个命令可以查看IP地址的连通性：A. telnetB. netstatC. pingD. tracert6. VLAN是指：A. 虚拟本地区域网络B. 可视化局域网C. 个人局域网D. 无线局域网7. 下面哪个设备可以实现不同局域网之间的互联：A. 集线器B. 路由器C. 交换机D. 网桥8. 下面哪个协议负责在网络中寻找设备的物理地址：A. ARPB. ICMPC. OSPFD. BGP9. 下面哪个命令可以查看交换机的端口信息：A. show ip interface briefB. show mac-address-tableC. show running-configD. show version10. 下面哪个协议可以实现安全的远程登录：A. FTPB. HTTPC. SSHD. Telnet【第二部分：填空题】（共5题，每题4分，共计20分）1. 在OSI模型中，位于物理层的设备是_________。

2. 在TCP/IP协议族中，位于传输层的协议是_________。

3. IP地址由_________位二进制数组成。

CCNA认证考试真题.doc

CCNA认证考试真题（1）TCP/IP Addressing and Protocol1: Your junior network administrator wants to know what the default subnet mask is for a Class C IP address. What do you tell him?A. 255.0.0.0B. 255.255.0.0C. 255.245.255.0D. 255.255.255.0E. 255.255.255.2552: An application needs to have reliable, end-to-end connect-ivity. Which of the following protocols will give you reliable connectivity?A. TCPB. UDPC. IPD. ICMP3: You are designing a network, which needs to support 55 users. You don't plan to extend the segment beyond the currentnumber of users. Which subnet mask would best meet your needs?A. 255.255.0.0B. 255.255.255.0C. 255.255.255.192D. 255.255.255.1604: You have added a new switch to your network. You want to manage it remotely, so you need to assign it an IP address. Your router that connects to the switch has an IP address of 172.16.12.33/27. Which of the following addresses can you assign to this switch?A. 172.16.12.33/28B. 172.16.12.32/27C. 172.16.12.33/27D. 172.16.12.34/27E. 172.16.12.35/28F. 172.16.12.38/28G. 172.16.12.63/275: The address 172.16.208.16/20 is a host address in which of the following subnets?A. 172.16.176.0–255.255.240.0B. 172.16.192.0–255.255.240.0C. 172.16.208.0–255.255.240.0D. 172.16.224.0–255.255.240.06: You are designing an IP address scheme for your brand new remote office. The vice president of IT calls to tell you that you will be in charge of the 192.168.1.64/26 subnetwork. This supplies you with a single subnetwork with 62 hosts. You need to have at least two subnets with 14 hosts in each subnet. What custom subnet mask should you use?A. 255.255.255.128B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.2487: You have subnetted the 210.106.14.0 network with a /24 mask. Your boss at Acme, Inc. wants to know how many usable subnetworks and usable host addresses per subnet this would provide. What should you tell her?A. One network with 254 hostsB. Two networks with 128 hostsC. Four networks with 64 hostsD. Six networks with 30 hosts8: Identify three valid host addresses in any subnet of the 201.168.27.0 network, assuming a fixed subnet mask of 255.255.255.240. (Choose three.)A. 201.168.27.33B. 201.168.27.112C. 201.168.27.119D. 201.168.27.126E. 201.168.27.175F. 201.168.27.2089: What is the subnetwork address for a host with the IP address 201.100.5.68/28?A. 201.100.5.0B. 201.100.5.32C. 201.100.5.64D. 201.100.5.65E. 201.100.5.31F. 201.100.5.110: Which of the following protocols uses a three-way handshake mechanism to establish sessions?A. TCPB. IPC. UDPD. IPXE. Frame relay11: Which of the following protocols is connection-oriented?A. TCPB. IPC. IPXD. Frame relay12: You are using an application on your Windows 2000 client machines that provides error correction. You need a protocol to provide fast transport. Which protocol should your application use?A. TCPB. IPC. UDPD. SPXE. AppleTalk13: When using TCP, after a session is open, the applications can adjust the number of segments they receive before sending an acknowledgment. This behavior is known as ______________.A. MTU adjustmentB. WindowingC. Flexible Send PathD. FCS14: If the destination did not receive a segment, how will the TCP host know to resend the information?A. The ACK received will not include the segment number that was not received.B. The ACK received will include the segment number that was not received.C. The sending host will send a PACK to verify segment receipt.D. The destination host will send a YACK message back to the sending host.15: You are planning on using a single network that supports 208 users. Which IP address class would you choose to be the most efficient?A. Class AB. Class BC. Class CD. Class DE. Class E16: RFC 1918 defines the private IP address ranges. Which of the following IP addresses are considered part of these ranges? (Choose three.)A. 10.23.45.67B. 126.21.34.56C. 172.16.32.1D. 172.31.234.55E. 192.169.4.517: A new network is being designed for your company, Acme,Inc. If you use a Class C IP network, which subnet mask will provide one usable subnet per department while allowing enough usable host addresses for each department specified in the table?DepartmentNumber of UsersCorporateCustomer SupportFinancialEngineeringA. 255.255.255.0B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.24818: Which of these protocols provides data transport, relying on the error correction capabilities of the application itself?A. UDPB. TCPC. SNMPD. ICMP19: Which of the following are used by TCP to ensure reliable delivery of data? (Choose two.)A. MAC address resolutionB. Sequence numbersC. AcknowledgmentsD. PingE. Routing updates20: You discover that you are able to adjust the window size of the TCP segment. You increase the window size to test the results. What will you observe happening on your network?A. Increased throughputB. Decreased throughputC. Increased latencyD. Decreased reliability21: Your organization is using the 192.168.1.0/24 address space. You need 28 subnets. What subnet mask would you use to create these subnets?A. 255.255.255.0B. 255.255.255.128C. 255.255.255.192D. 255.255.255.224E. 255.255.255.240F. 255.255.255.24822: Which of the following protocols maps IP addresses to MAC addresses for connectivity to occur between two hosts?A. ARPB. RARPC. SLARPD. DHCP23: Your junior network administrator cannot seem to ping a host in another network and asks you why it isn't working. Which of the following is not an answer that you would give him?A. The host's default gateway is down.B. The destination host is not powered on.C. The IP address of the router interface is incorrect.D. The IP address of the switch to which the destination host connects is incorrect.E. The host is in a different subnet.24: Which of the following classes of IP addresses is utilized for multicasting?A. Class AB. Class BC. Class CD. Class D25: You give your IT department a spreadsheet of IP addresses and their subnets. You receive a call from one of the junior techs asking what the /26 means next to the IP addresses. You tell her:A. It represents the number of hosts possible on that subnetwork.B. It represents the number of subnetworks that are being used.C. It represents the class of IP address being used.D. It represents the number of bits in the subnet mask that are 1.26: You are given an IP network of 192.168.5.0 and told that you need to separate this network into subnetworks that can support a maximum of 16 hosts per subnet. This will help alleviatecongestion on the network. What subnet mask can you use to create the subnets necessary to meet the given criteria?A. 255.0.0.0B. 255.255.0.0C. 255.255.255.0D. 255.255.255.224E. 255.255.255.24027: Which of the following would a Class A network be assigned to?A. Government agencyB. Small-to-medium sized corporationC. SOHOD. An individual28: A client has the IP address 192.168.5.98/27. Which of the following addresses are on the same subnet as this host? (Choose two.)A. 192.168.5.95B. 192.168.5.100C. 192.168.5.128D. 192.168.5.11029: Which of the following IP addresses is not a public IP address that can be routed over the Internet?A. 2.3.4.5B. 11.12.13.14C. 165.23.224.2D. 172.31.45.34E. 203.33.45.2230: You are given a Class B network. What is the default subnet mask assigned to the Class B network?A. 255.255.255.255B. 255.255.0.0C. 255.224.0.0D. 0.0.0.031: You are troubleshooting your router's interfaces. For some reason, the Ethernet interface will not accept the IP address of 192.168.5.95/27 that you've assigned. Which of the following explains the router's refusal to take the IP address?A. Class C addresses cannot be assigned to Ethernet interfaces.B. The /27 is an invalid mask.C. It is a broadcast address.D. It is a public IP address.E. It is a private IP address.32: You are a network technician at Acme, Inc. You are required to divide the 172.12.0.0 network into subnets. Each subnet must have the capacity of 458 IP addresses. Also, according to the requirements, you must provide the maximum number of subnets. Which subnet mask should you use?A. 255.255.255.254B. 255.255.254.0C. 255.255.240.254D. 255.255.0.033: What is the subnetwork and broadcast IP address of 192.168.2.37 with the subnet mask of 255.255.255.248?A. 192.168.2.24/192.168.2.31B. 192.168.2.32/192.168.2.39C. 192.168.2.40/192.168.2.47D. 192.168.2.48/192.168.2.55E. 192.168.2.56/192.168.2.6334: One of your co-workers at Acme, Inc., needs to convert the binary number 11011010 into a decimal. What is the decimal equivalent?A. 218B. 219C. 220D. 221E. 22235: One of your co-workers at Acme, Inc., needs to convert the binary number 01011010 into a decimal. What is the decimal equivalent?A. 75B. 83C. 90D. 9736: One of your co-workers at Acme, Inc., needs to convert the binary number 11010110 into a decimal. What is the decimal equivalent?A. 198B. 214C. 252D. 25537: One of your co-workers at Acme, Inc., needs to convert the binary number 10110110 into a decimal. What is the decimal equivalent?A. 182B. 192C. 202D. 21238: You are configuring a subnet for the Acme, Inc., branch office in Beijing. You need to assign IP addresses to hosts in this subnet. You have been given the subnet mask of 255.255.255.224. Which of these IP addresses would be valid? (Choose three.)A. 15.234.118.63B. 92.11.178.93C. 134.178.18.56D. 192.168.16.87E. 201.45.116.159F. 217.63.12.19239: You are a network technician at Acme, Inc. You have subnetted the 208.98.112.0 network with a /28 mask. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router is using ip subnet-zero?A. 62 networks and 2 hostsB. 6 networks and 30 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hostsE. 16 networks and 14 hosts40: What is a disadvantage of using a connection-oriented protocol such as TCP?A. Packet acknowledgment might add overhead.B. Packets are not tagged with sequence numbers.C. Loss or duplication of data packets is more likely to occur.D. The application layer must assume responsibility for the correct sequencing of the data packets.41: You are a network technician at Acme, Inc. You have subnetted the 192.168.72.0 network with a /30 mask for connections between your routers. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router cannot use ip subnet-zero?A. 62 networks and 2 hostsB. 6 networks and 30 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hostsE. 14 networks and 14 hosts42: Which of the following IP addresses are considered "network" addresses with a /26 prefix? (Choose two.)A. 165.203.2.0B. 165.203.5.192C. 165.203.6.63D. 165.203.6.191E. 165.203.8.25543: Identify three valid hosts in any subnet of 192.168.32.0, assuming the subnet mask used is 255.255.255.240. (Choose three.)B. 192.168.32.112C. 192.168.32.119D. 192.168.32.126E. 192.168.32.175F. 192.168.32.20844: A Class C network address has been subnetted with a /27 mask. Which of the following addresses is a broadcast address for one of the resulting subnets?A. 198.57.78.33B. 198.57.78.64C. 198.57.78.97D. 198.57.78.97E. 198.57.78.159F. 198.57.78.25445: What is the subnetwork address for a host with IP address 165.100.5.68/28?A. 165.100.5.0C. 165.100.5.64D. 165.100.5.65E. 165.100.5.31F. 165.100.5.146: Your boss wants to know what TCP stands for. What do you tell him?A. Transmission Check ProtocolB. Transport Check ProtocolC. Transmission Control ProtocolD. Transport Control Protocol47: Your boss wants to know what UDP stands for. What do you tell him?A. Unreliable Data ProtocolB. Unreliable Data ProgramC. User-Defined ProtocolD. User Datagram Protocol48: Which of the following statements accurately describesUDP?A. UDP copies files between a computer and a system running rshd, the remote shell service (daemon).B. UDP is a member of the TCP/IP suite of protocols that governs the exchange of electronic mail between message transfer agents.C. UDP is a member of the TCP/IP suite of protocols and is used to copy files between two computers on the Internet. Both computers must support their respective roles: one must be a client, and the other a server.D. UDP is a TCP complement that offers a connectionless datagram service guaranteeing neither delivery nor correct sequencing of delivered packets (much like IP).49: Which of the following host addresses are members of networks that can be routed across the public Internet? (Choose three.)A. 10.20.12.64B. 172.16.32.129C. 172.64.32.34D. 192.168.23.252E. 196.104.12.95F. 214.192.48.25450: You are connecting your Serial 0/1 interface to the Internet. Which of the following need to be done for the connection to work? (Choose two.)A. Assign a public IP address.B. Use the shutdown command.C. Use the no shutdown command.D. Make sure the interface is running in full-duplex.（2）Basic IOS Configuration1: In which of the following modes in Cisco's IOS can you issue show commands? (Choose two.)A. UserB. PrivilegedC. Line ConfigurationD. Global Configuration2: Yo u are the network administrator for a large corporation. You want to be able to store all your configurations in a centralized location. Which of these servers will allow you to do so? (Choose two.)A. FTPB. TFTPC. SQLD. Oracle3: You need to troubleshoot your network IP connectivity. Which of the following commands would you use to find the IP address on your Ethernet 0 interface?A. pingB. IPConfigC. tracerouteD. Show interface Ethernet 04: Which command would you use at the CLI in User mode to enter Privileged EXEC mode?A. PrivilegeB. AdminC. EnableD. Disable5: You have just received 14 Catalyst switches for your network. You would like to install these switches into your productionnetwork to provide separate collision domains for each of the connected devices. What configuration is required to provide this functionality?A. No configuration is required.B. You must set up an IP address on the switch.C. You must configure unique VLANs on the switches.D. You must install the Cisco IOS.6: Which of the following prompts indicates your router is in Privileged EXEC mode?A. Router>B. Router#C. Router&D. Router$7: You have made a console connection to your Cisco Catalyst switch and you see the > symbol in HyperTerminal. What does it mean?A. You are in Privileged EXEC mode.B. You are in User EXEC mode.C. The switch has not been configured.D. The switch is in need of repairs.8: You would like to assign a meaningful name to your Catalyst switch. What command should you use?A. enableB. host nameC. hostnameD. name9: You need to assign an IP address to your Catalyst 2950 switch. You are at the HQ_SW1> prompt. What is the correct series of commands? (cr = carriage return)A. enable ip address 10.1.1.1B. enable ip address 10.1.1.1 255.255.255.0C. enable configure terminal ip address 10.1.1.1 255.255.255.0D. enable configure terminal interface vlan 1 ip address10.1.1.1 255.255.255.010: Which of the following commands displays the syntax for the clock command?A. cl?B. clock?C. clock ?D. cl ?11: Which of the following commands allows you to configure a welcoming message whenever you log in to a router?A. Router(config)# banner messageB. Router(config)# banner motd &C. Router# banner motd #D. Router# banner message !12: You need to connect to your 2621XM router to configure an interface. Which of the following methods allows you to connect to and issue commands on the router? (Choose three.)A. TelnetB. FTPC. Console connectionD. AUX connection13: You want to prevent unauthorized users from plugging their laptops into the router. What type of password helps prevent this issue?A. vtyB. InterfaceC. ConsoleD. Enable14: You have connected to the console port and are running HyperTerminal. You see only scrambled characters and symbols. What is the most likely solution to this problem?A. Change the connectors.B. Use a different Terminal program.C. Reset the router.D. Adjust the baud rate of your COM port.[View full size image]15: Which of the following commands would you type to receive this output shown in the figure above?A. Show running-configB. Show startup-configC. Show ip routeD. Show version16: You are configuring a router named East for authentication with a router named West using CHAP. What username should youconfigure on East to allow the routers to communicate?A. EastB. WestC. SouthD. North17: What is the default point-to-point encapsulation protocol used on a Cisco router?A. PPPB. SLIPC. HDLCD. ATM18: What type of handshake occurs with CHAP authentication?A. One-wayB. Two-wayC. Three-wayD. Mutual19: You have connected to your Cisco router through a Telnet connection. To test one of your connections, you use a debug ippacket command. Even though you are sure traffic is passing through your router, nothing is reported in your terminal window. What is the most likely cause of this problem?A. There is no debug ip packet command.B. You need to type in the terminal monitor command to see debug output from a Telnet session.C. This command displays information only if the interface experiences trouble. No output indicates that the interface is fine.D. Cisco routers do not allow you to enable debug commands remotely due to security restrictions.[View full size image]20: Which of the following commands would you type to see this output on your Cisco router shown in the previous figure?A. Show versionB. Show running-configC. Show startup-configD. Show router setup21: Which of the following commands would you type to see this output shown in the figure above?A. Show interface Ethernet 0/0B. Show ip interface detailC. Show interface Serial 0/1D. Show ip interface brief22: Your routers at ACME, Inc., are having some connectivity issues. You issue show commands for each connecting router's interface. Why are they unable to communicate (see figures above)?A. Incorrect IP addressB. Wrong routing protocolC. Bad cableD. Encapsulation mismatch23: You need to back up the configurations you just made, but no TFTP servers are available. Which of the following commands are options to back up your currently running configuration? (Choose two.)A. Router1#copy running-config startup-configB. Router1#copy running-config flashC. Router1#copy startup-config running-configD. Router1#copy running-config http24: You are consulting a small business that is establishing itsfirst WAN link. The client wants to know what encapsulation you will be using on the link. Which of the following are valid encapsulations for WAN links? (Choose three.)A. Frame relayB. EthernetC. Token ringD. PPPE. HDLC25: Your boss is concerned about security on your network. She wants to make sure that no one can identify passwords if he or she happens to view a configuration on your router. What command encrypts all passwords on your router?A. Router1#service password-encryptionB. Router1(config)#service password-encryptionC. Router1#enable secret passwordD. Router1(config)#enable secret password26: You need to set up a password that will prevent unauthorized users from telnetting into your router. What series of commands would you use?A. Acme1(config)# line console 0Acme1(config-line)# password acmeAcme1(config-line)# loginB. Acme1(config)# line vty 0Acme1(config-line)# enable password acmeC. Acme1(config)# line vty 0Acme1(config-line)# enable secret acmeAcme1(config-line)# loginD. Acme1(config)# line vty 0Acme1(config-line)# password acmeAcme1(config-line)# login27: When you are setting up your serial interfaces, what does the clockrate command do for your connection?A. Establishes the timing at which you send dataB. Establishes keepalivesC. Establishes the advertised bandwidthD. Establishes the time on the router28: You need to set up passwords on all your default Telnet lines. What command would you start with?A. Router1(config)#telnet configurationB. Router1(config)#interface Ethernet 0/1C. Router1(config)#line vty 1 5D. Router1(config)#line vty 0 429: You can execute show commands at which prompt? (Choose two.)A. Router1#B. Router1(config)#C. Router1(config-router)#D. Router1>E. romon1>30: You are configuring your router and type in an Enable password and an Enable Secret password. Your fellow network technician asks you why you have two passwords set when you need only one. What do you tell him?A. The Enable password is used by low-level applications.B. If you reverted to an older version of the IOS, it would not understand the Secret password.C. Both passwords are treated the same.D. It is a failsafe method of ensuring that people need to type two passwords instead of just one.31: You need to get back to Privileged EXEC mode from Interface Configuration mode. What is the quickest method?A. Ctrl+Shift+6; then press XB. Ctrl+EscC. Ctrl+ZD. Type exit32: When you are establishing a PPP link, which of the following would be negotiated? (Choose three.)A. IPCPB. CHAPC. UDPD. Q.931E. Multilink Protocol33: Which of the following commands returns your router to a previously saved configuration?A. Router1#setupB. Router1#copy running-config startup-configC. Router1#copy startup-config running-configD. Router1#reload34: You are in Interface Configuration mode and would like to recall the last command you typed, move your cursor to the beginning of the command line, and type no before the recalled command. You notice your up- and down-arrow keys do not function because you are using an older terminal program. What command combinations could you use to recall the previous command and move your cursor to the beginning of the line?Press Ctrl+P to recall the previous command and Ctrl+A to move to the beginning of the command line.Press Ctrl+L to recall the previous command and Ctrl+B to move to the beginning of the command line.Press Ctrl+D to recall the previous command and Ctrl+A to move to the beginning of the command line.Press Ctrl+E to recall the previous command and Ctrl+A to move to the beginning of the command line.35: What is the baud rate setting for your terminal emulation program so that you can communicate through your console port?A. 2400B. 9600C. 14400D. 3630036: What must be configured on a Cisco device to enable Telnet functionality?A. A management IP addressB. SNMPC. CDPD. vty ports37: You are configuring your Cisco router and need to go back to User EXEC mode. What command takes you back to User EXEC mode?A. Router1#enableB. Router1#exitC. Router1#configure terminalD. Router1#disable38: Which of the following commands places an IP address on your Catalyst switch?A. Switch1#ip address 10.2.2.2 255.255.255.0B. Switch1(config)#Set IP 10.2.2.2 255.255.255.0C. Switch1(config-vlan)#ip address 10.2.2.2D. Switch1(config-vlan)#ip address 10.2.2.2 255.255.255.039: Which of the following commands would you enter to receive this output shown in the figure above?A. Router1#show NVRAMB. Router1#show FlashC. Router1#show Flash-MemD. Router1#show V ersion40: Your senior network administrator is unable to telnet to a Catalyst switch because she forgot the IP address. You have physical access and are able to console in. Which of the following commands is the best to get the IP address on the switch?A. Switch1#show ipB. Switch1#show vlan 1C. Switch1#show ip routeD. Switch1#show interface vlan141: You have powered up your Cisco 3640 router. The first thing you see is this output. Which of the following statements about this screen is accurate (see figure above)?A. Your IOS is corrupt and unable to load.B. Your configuration is missing parameters.C. You do not have a configuration saved in NVRAM.D. You have typed setup in the Privileged mode.42: You type in a command and are shown the following output:% Ambiguous command: "show con"What does this mean?A. You did not enter enough characters for your device to recognize the command.B. You did not enter all the keywords or values required by this command.C. You entered the command incorrectly.D. Context-sensitive help is unable to helbreak.B. The router truncates the command because commands longer than one line are not allowed.C. The router automatically scrolls the line to the left and uses a dollar sign ($) to indicate that there is text to the left of the $.D. The router shortens all the commands to squeeze thecommand on to the screen.44: You want to change the size of the command history buffer. Which of the following commands will set it permanently to 100?A. Router1#terminal history 100B. Router1#history size 100C. Router1(config)#terminal history 100D. Router1(config-line)#history size 10045: You have configured a description on your serial interfaces. Which of the following commands displays the description? (Choose two.)A. Show running-configB. Show flashC. Show interfacesD. Show ip protocols46: You are typing commands into your Cisco IOS on your 3640 router. However, your typing is consistently interrupted by console messages, forcing you to retype. Which of the following commands forces the IOS to retype your original input after it displays the console message?A. Exec-timeoutB. Logging synchronousC. Line consoleD. Exec message readout47: You are configuring a router and issue the command interface ethernet 1/0/0. What do the numbers represent?A. Slot/port/interfaceB. Slot/interface/portC. Port/slot/port numberD. Slot/port adapter/port number48: Which of the following commands correctly sets the physical speed of a serial interface to 64Kbps?A. Router1(config-if)#bandwidth 64B. Router1(config-if)#bandwidth 64000C. Router1(config-if)#clockrate 64D. Router1(config-if)#clockrate 6400049: In what mode do you use the encapsulation command?A. Interface Configuration modeB. Sub-interface Configuration modeC. User modeD. Privileged mode50: You are configuring your router, and your boss happens to look over your shoulder as you type a show running-config command. She sees one of the lines that says password 7 14361F009A056E7D and asks what this means. What do you tell her?A. It is the actual password.B. It is the result of a service password-encryption command.C. The console output made a mistake.D. It is the result of an enable secret command.。

ccna中文试题及详解

1.对于MSFC（多层交换功能卡）的说法不正确的是A. MSFC只能运行IOS系统B. MSFC可运行IOS系统，或者CatOS系统C. 如果交换机管理引擎（Supervisor Engine）上运行的是CatOS系统，则所安装的MSFC必须D. 在管理引擎和MSFC上可同时运行IOS系统2. ROMmon模式恢复丢失映象的IOS交换机中，用来加载新的启动映射的命令是A. boot bootflash:B. boot system flash bootflash:C. boot tftp:D. copy tftp flash:3.现要把一个cisco交换机端口添加到多个VLAN中，则需要把该端口设置成（）模式A. access portB. trunk portC. routed portD. tunnel port4.如下图所示的网络拓扑结构中，cisco交换机4的根路径开销（Root Path Cost）为A. 4B. 19C. 23D. 275.下面关于端口属性的说法不正确的是A. 快速以太网(10/100 Mbps)端口支持10 Mbps或者100 Mbps速率和所有双工选项B. 仅工作在1000 Mbps的千兆以太网端口不支持半双工模式C. 100BASE-x 和1000BASE-x SFP模块端口支持所有双工选项，但不支持速率自动协商D. 不能为10G以太网端口配置速率和双工模式6.有两台交换机想要通过两个普通RJ-45交换端口实现级联，并且支持直通和交叉电缆，则下面（）配置步骤描述是不正确的A. 要在相连的两端口上分别配置auto-MDIX设置B. 可只在相连的任一端口上配置auto-MDIX设置C. 在启用auto-MDIX功能后，必须设置接口速率和双工模式为“auto”（自动）D. 不能使用1000BASE-SX /-LX SFP模块端口，但可使用10/100/1000BASE-TX SFP模块端口7.下面（）不是Cisco设备VLAN间路由的可选方案A. 网关B. RSMC. RSFCD. 路由器8.下面是在Cisco交换机上一个把gigabitethernet0/1接口添加到VLAN 10的配置步骤，但其中少了关键的一步。

ccna1_6测试真题

1What subnet mask would a network administrator assign to a network address of 172.30.1.0 if it were possible to have up t255.255.0.0255.255.255.0255.255.254.0255.255.248.02W hich IPv4 subnetted addresses represent valid host addresses? (Choose three.)172.16.4.127 /26172.16.4.155 /26172.16.4.193 /26172.16.4.95 /27172.16.4.159 /27172.16.4.207 /273Which statements are true regarding IP addressing? (Choose two.)NAT translates public addresses to private addresses destined for the Internet.Only one company is allowed to use a specific private network address space.Private addresses are blocked from public Internet by router.Network 172.32.0.0 is part of the private address space.IP address 127.0.0.1 can be used for a host to direct traffic to itself.4W hich process do routers use to determine the subnet network address based upon a given IP address and subnet mask?binary addinghexadecimal andingbinary divisionbinary multiplicationbinary ANDing5Refer to the exhibit. Host A is connected to the LAN, but it cannot get access to any resources on the Internet. The configu host is shown in the exhibit. What could be the cause of the problem?The host subnet mask is incorrect.The default gateway is a network address.The default gateway is a broadcast address.The default gateway is on a different subnet from the host.6Refer to the exhibit. The network administrator has assigned the internetwork of LBMISS an address range of 192.168.10.0 range has been subnetted using a /29 mask. In order to accommodate a new building, the technician has decided to use th for configuring the new network (subnet zero is the first subnet). By company policies, the router interface is always assign usable host address and the workgroup server is given the last usable host address. Which configuration should be entere workgroup server's properties to allow connectivity to the network?IP address: 192.168.10.38 subnet mask: 255.255.255.240 default gateway: 192.168.10.39IP address: 192.168.10.38 subnet mask: 255.255.255.240 default gateway: 192.168.10.33IP address: 192.168.10.38 subnet mask: 255.255.255.248 default gateway: 192.168.10.33IP address: 192.168.10.39 subnet mask: 255.255.255.248 default gateway: 192.168.10.31IP address: 192.168.10.254 subnet mask: 255.255.255.0 default gateway: 192.168.10.17Which three IP addresses are private? (Choose three.)172.168.33.110.35.66.70192.168.99.5172.18.88.90192.33.55.89172.35.16.58G iven the IP address and subnet mask of 172.16.134.64 255.255.255.224, which of the following would describe this addreThis is a useable host address.This is a broadcast address.This is a network address.This is not a valid address.9How many bits make up an IPv4 address?12864483210W hat three facts are true about the network portion of an IPv4 address? (Choose three.)identifies an individual deviceis identical for all hosts in a broadcast domainis altered as packet is forwardedvaries in lengthis used to forward packetsuses flat addressing11Which of the following network devices are recommended to be assigned static IP addresses? (Choose three.)LAN workstationsserversnetwork printersroutersremote workstationslaptops12W hich of the following are features of IPv6? (Choose three.)larger address spacefaster routing protocolsdata types and classes of serviceauthentication and encryptionimproved host naming conventionssame addressing scheme as IPv413Refer to the exhibit. Which network prefix will work with the IP addressing scheme shown in the graphic./24/16/20/27/25/2814W hat two things will happen if a router receives an ICMP packet which has a TTL value of 1 and the destination host is se away? (Choose two.)The router will discard the packet.The router will decrement the TTL value and forward the packet to the next router on the path to the destination hostThe router will send a time exceeded message to the source host.The router will increment the TTL value and forward the packet to the next router on the path to the destination host.The router will send an ICMP Redirect Message to the source host.15Refer to the exhibit. Why would the response shown be displayed after issuing the command ping 127.0.0.1 on a PC?The IP settings are not properly configured on the host.Internet Protocol is not properly installed on the host.There is a problem at the physical or data link layer.The default gateway device is not operating.A router on the path to the destination host has gone down.16What is the primary reason for development of IPv6?securityheader format simplificationexpanded addressing capabilitiesaddressing simplification17W hat is the network address of the host 172.25.67.99 /23 in binary?10101100. 00011001.01000011.0000000010101100. 00011001.01000011.1111111110101100. 00011001.01000010.0000000010101100. 00011001.01000010.0110001110101100. 00010001.01000011. 0110001010101100. 00011001.00000000.0000000018Refer to the exhibit. A network administrator discovers that host A is having trouble with Internet connectivity, but the serve connectivity. In addition, host A has full connectivity to the server farm. What is a possible cause of this problem?The router has an incorrect gateway.Host A has an overlapping network address.Host A has an incorrect default gateway configured.Host A has an incorrect subnet mask.NAT is required for the host A network.19W hat is a group of hosts called that have identical bit patterns in the high order bits of their addresses?an interneta networkan octeta radix20 A router interface has been assigned an IP address of 172.16.192.166 with a mask of 255.255.255.248. To which subnetaddress belong?172.16.0.0172.16.192.0172.16.192.128172.16.192.160172.16.192.168172.16.192.17621Refer to the exhibit. A network administrator has to develop an IP addressing scheme that uses the 192.168.1.0 /24 addre network that contains the serial link has already been addressed out of a separate range. Each network will be allocated t number of host addresses. Which network mask will be appropriate to address the remaining networks?255.255.255.248255.255.255.224255.255.255.192255.255.255.240255.255.255.128255.255.255.252。

ccna试题

ccna试题一、单选题1. 下面哪个是OSI模型的物理层？A. TCPB. IPC. EthernetD. HTTP答案：C2. 以下哪个是IPv6的全球未经分配地址？A. FC00::/7B. 2000::/3C. 8000::/4D. FFFF::/8答案：A3. 以下哪个在OSI模型的会话层工作？A. HTTPB. IPC. TCPD. NetBIOS答案：D二、多选题4. 下面哪些是用于路由器接口配置的命令？（选择两个）A. ip addressB. mac addressC. interfaceD. enable答案：A, C5. 下面哪些是IP协议的特点？（选择三个）A. 可靠传输B. 无连接C. 不可靠传输D. 面向连接答案：B, C, D6. 下面哪些是TCP的特点？（选择三个）A. 面向连接B. 可靠传输C. 无连接D. 面向字节流答案：A, B, D三、填空题7. TCP/IP协议族中，网络接口层对应的是__________。

答案：网络接口8. 在IPv6地址中，一个冒号表示__________。

答案：前缀和后缀之间的分隔符9. 在TCP连接终止过程中，主动关闭连接的一方发送的最后一个ACK分组中ACK标志位的值是__________。

答案：1四、解答题10. 请简要解释TCP/IP协议族中IP协议的作用。

答案：IP（Internet Protocol）协议是TCP/IP协议族中的一种网络层协议，主要负责在网络之间传输数据包。

它使用IP地址来标识网络上的设备，并通过路由选择算法实现数据包的正确传递。

IP协议是一种无连接的协议，不提供数据包的可靠传输，也不保证数据包按顺序到达目的地。

它使用IP头部来存储必要的控制信息，如源IP地址、目的IP地址、数据包长度等。

11. 请简要描述TCP三次握手的过程。

答案：TCP三次握手用于建立一个TCP连接。

过程如下：1. 客户端向服务器发送一个SYN（同步）分组，其中设置SYN标志位为1，并选择一个初始序列号。

ccna考试题及答案

ccna考试题及答案1. 以下哪项是网络层的功能？A. 路由选择B. 错误检测C. 流量控制D. 封装数据包答案：A2. 在OSI模型中，哪一层负责在网络中传输数据？A. 应用层B. 传输层C. 会话层D. 网络层答案：D3. 以下哪个协议是用于在IP网络中发现网络设备的？A. ARPB. RARPC. ICMPD. OSPF答案：A4. 在TCP/IP模型中，哪一层与OSI模型的传输层相对应？A. 应用层B. 互联网层C. 网络接口层D. 传输层答案：D5. 以下哪个地址是一个有效的IPv4地址？A. 192.168.1.256B. 192.168.1.1C. 10.0.0.0D. 172.16.300.1答案：B6. 在配置路由器时，以下哪个命令用于进入全局配置模式？A. enableB. configure terminalC. privileged execD. user exec答案：B7. 以下哪个命令用于在Cisco设备上显示当前配置？A. show running-configB. show startup-configC. show configD. show current-config答案：A8. 在Cisco设备上，以下哪个命令用于保存当前的配置到启动配置文件？A. copy running-config startup-configB. copy startup-config running-configC. save running-configD. save startup-config答案：A9. 以下哪个命令用于在Cisco设备上查看所有接口的状态？A. show interfacesB. show ip interface briefC. show interface statusD. show running-config interface答案：B10. 在Cisco设备上，以下哪个命令用于关闭接口？A. shutdownB. no shutdownC. disableD. no enable答案：A11. 以下哪个命令用于在Cisco设备上启用接口？A. shutdownB. no shutdownC. disableD. no enable答案：B12. 在配置静态路由时，以下哪个命令用于指定下一跳地址？B. ip static-routeC. route ipD. static-route ip答案：A13. 以下哪个命令用于在Cisco设备上清除ARP表？A. clear arp-cacheB. clear arpC. clear arp tableD. clear ip arp答案：D14. 在配置动态路由协议时，以下哪个命令用于在接口上启用RIP？A. ip rip enableB. ip rip receiveD. network rip答案：C15. 以下哪个命令用于在Cisco设备上查看RIP路由表？A. show ip ripB. show ip route ripC. show ripD. show ip protocols答案：B16. 在配置EIGRP时，以下哪个命令用于指定自动汇总？A. metric weightsB. auto-summaryC. network auto-summaryD. no auto-summary答案：B17. 以下哪个命令用于在Cisco设备上查看EIGRP邻居？A. show ip eigrp neighborsB. show eigrp neighborsC. show ip eigrpD. show eigrp interfaces答案：A18. 在配置OSPF时，以下哪个命令用于指定路由器ID？A. router-idB. router ospfC. networkD. area答案：A19. 以下哪个命令用于在Cisco设备上查看OSPF路由表？A. show ip ospfB. show ip ospf databaseC. show ospfD. show ip route ospf答案：D20. 在配置VLAN时，以下哪个命令用于创建一个新的VLAN？A. vlan databaseB. configure terminalC. vlan [vlan-id]D. new-vlan答案：C21. 以下哪个命令用于将接口分配给VLAN？A. switchport mode accessB. switchport mode trunkC. switchport access vlan [vlan-id]D. switchport trunk vlan [vlan-id]答案：C22. 在配置交换机时，以下哪个命令用于将接口设置为Trunk 模式？A. switchport mode accessB. switchport mode trunkC. switchport access vlan [vlan-id]D. switchport trunk vlan [vlan-id]答案：B23. 以下哪个命令用于在Cisco设备上查看VLAN配置？A. show vlanB. show vlan briefC. show vlan detailD. show vlan all答案：B24. 在配置VTP时，以下哪个命令用于将交换机设置为VTP服务器模式？A. vtp mode serverB. vtp mode clientC. vtp mode transparentD. vtp mode off答案：A25. 以下哪个命令用于在Cisco设备上查看VTP状态？A. show vtp statusB. show vtp statisticsC. show vtp passwordD. show vtp configuration答案：A26. 在配置STP时，以下哪个命令用于设置根桥？A. spanning-tree root primaryB. spanning-tree root secondaryC. spanning-tree root primary [priority]D. spanning-tree root secondary [priority]答案：C27. 以下哪个命令用于在Cisco设备上查看STP状态？A. show spanning-treeB. show spanning-tree detailC. show spanning-tree summaryD. show spanning-tree interface答案：A28. 在配置VLAN Trunking Protocol (VTP) 时，以下哪个命令用于设置VTP域名？A. vtp domain [domain-name]B. vtp password [password]C. vtp mode [mode]D. vtp version [version]答案：A29. 以下哪个命令用于在Cisco设备上查看当前的VTP版本？A. show vtp statusB. show vtp statisticsC. show vtp passwordD. show vtp configuration答案：A30. 在配置端口安全时，以下哪个命令用于限制接口上可以学习到的最大MAC地址数量？A. switchport port-security maximum [mac-count]B. port-security maximum [mac-count]C. switchport port-security violation restrictD. port-security violation shutdown答案：A这些题目和答案仅供学习和参考之用，实际的CCNA考试内容和形式可能会有所不同。

ccna测试题及答案

ccna测试题及答案CCNA测试题及答案一、选择题1. 在Cisco设备上，以下哪个命令用于查看当前的路由表？A. show ip routeB. show running-configC. show interface statusD. show version答案：A2. 以下哪个协议用于在网络中自动发现其他设备？A. ARPB. CDPC. ICMPD. TCP答案：B3. 以下哪个命令用于配置Cisco设备上的接口？A. configure terminalB. interfaceC. ip addressD. hostname答案：A二、填空题4. 在Cisco设备上，使用命令_________可以查看接口的配置信息。

答案：show interface5. 静态路由配置中，_________命令用于指定下一跳地址。

答案：ip route6. 动态路由协议可以自动适应网络变化，其中_________是最常见的一种。

答案：RIP（路由信息协议）三、简答题7. 请简述VLAN（虚拟局域网）的作用。

答案：VLAN是一种将局域网内不同物理位置的设备划分为同一逻辑网络的技术，主要用于隔离广播域，提高网络的安全性和效率。

8. 描述交换机和路由器在网络中的基本功能。

答案：交换机主要用于局域网内部，通过MAC地址表来转发数据帧，实现数据包在局域网内的快速交换。

路由器则工作在网络层，使用IP地址来转发数据包，连接不同的网络，并进行路径选择。

四、计算题9. 假设一个子网掩码为255.255.255.192，计算这个子网的可用IP地址范围。

答案：可用IP地址范围为192.168.1.0到192.168.1.62（包含两端）。

五、实验题10. 请根据以下配置文件，列出Router1的接口配置信息。

```Router1show running-configinterface FastEthernet0/0ip address 192.168.1.1 255.255.255.0duplex autospeed auto!interface FastEthernet0/1no ip addressshutdown!interface Serial0/0/0ip address 10.0.0.1 255.255.255.252clock rate 64000!router ospf 1network 192.168.1.0 0.0.0.255 area 0network 10.0.0.0 0.0.0.3 area 0!```答案：- FastEthernet0/0: IP地址为192.168.1.1，子网掩码为255.255.255.0，双工模式和速度均为自动。

CCNA认证试题(中文+答案)

CCNA认证试题一（附答案和解析）中文版(一）1、目前,我国应用最为广泛的LAN标准是基于(）的以太网标准.（A) IEEE 802。

1(B) IEEE 802。

2（C) IEEE 802.3（D）IEEE 802.5答案：C参考知识点：现有标准:IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802。

3 以太网IEEE 802.4 令牌总线IEEE 802。

5 令牌环IEEE 802.8 FDDIIEEE 802。

11 无线局域网记住IEEE802.1-——-—--IEEE802。

5的定义以太网是一种计算机局域网组网技术.IEEE制定的IEEE 802。

3标准给出了以太网的技术标准.它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术.它很大程度上取代了其他局域网标准,如令牌环、FDDI和ARCNET。

以太网的标准拓扑结构为总线型拓扑，但目前的快速以太网（100BASE—T、1000BASE-T标准）为了最大程度的减少冲突，最大程度的提高网络速度和使用效率，使用交换机（Switch）来进行网络连接和组织,这样，以太网的拓扑结构就成了星型，但在逻辑上，以太网仍然使用总线型拓扑的C**＊A/CD介质访问控制方法.电气电子工程师协会或IEEE（Institute of Electrical and Electronics Engineers）是一个国际性的电子技术与信息科学工程师的协会.建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万.专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志,学报,书籍和每年组织300多次专业会议。

IEEE定义的标准在工业界有极大的影响.下面列出：IEEE802．3以太网标准802。

3--——---—— 10Base以太网标准802.3u-—------ 100Base-T（快速以太网）802.3z—-—————— 1000Base-X（光纤吉比特以太网）802.3ab———-——-— 1000Base—T（双绞线吉比特以太网）2、对于这样一个地址，192。

CCNA综合试卷

CCNA集训队综合试卷一、选择题( 40分)1．交换机进行数据转发时，依据的是（）。

（A）IP地址（B）MAC地址（C）主机名称（D）网络标识2．对交换机配置时，应将配置线缆插入（）。

（A）Ethernet口（B）AUX口（C）Serial口（D）Console口3．下列哪个服务提供域名到IP地址的解析服务（）。

（A）48位、48位（B）32位、32位（C）48位、32位（D）32位、48位10．以下网络互连设备中，属于物理层的设备是（）。

（A）801.z （B）802.3 （C）Trunk （D）Spanning Tree13．对IP地址为192.168.2.1的主机不停发送数据包的命令ping命令是（）。

CCNA路由部分测试题(含答案)

CCNA路由部分测试题（共50题）1.当路由器接收的IP报文的目的地址不是本路由器的接口IP地址，并且在路由表中未找到匹配的路由项，采取的策略是什么？A.丢掉该分组B.将该分组分片C.转发该分组D.以上答案均不对ANSWER:A2.IGP 的作用范围是？A.区域内B.自然子网范围内C.局域网内D.自治系统内ANSWER:D3.距离矢量协议包括？(多选)A.RIPB.IS-ISC.OSPFD.EIGRPANSWER:A D4.解决路由环问题的办法是？(多选)A.定义路由权的最大值B.路由保持法C.水平分割D.路由器重启ANSWER:A B C5.在rip 中metric 等于什么值为不可达？A.8B.10C.15D.16ANSWER:D6.下列关于OSPF 协议的说法正确的是？(多选)A.OSPF 支持基于接口的报文验证B.OSPF 支持到同一目的地址的多条等值路由C.OSPF 是一个基于链路状态算法的边界网关路由协议D.OSPF 发现的路由可以根据不同的类型而有不同的优先级ANSWER:A B D7.如果一个内部网络对外的出口只有一个，那么最好配置？A.缺省路由B.主机路由C.动态路由ANSWER:A8.以下不属于动态路由协议的是？A.RIPB.ICMPC.EIGRPD.OSPFANSWER:B9.关于矢量距离算法以下哪些说法是错误的？A.矢量距离算法不会产生路由环路问题B.矢量距离算法是靠传递路由信息来实现的C.路由信息的矢量表示法是（目标网络，metric）D.使用矢量距离算法的协议只从自己的邻居获得信息ANSWER:A10.以下哪些路由表项要由网络管理员手动配置？(多选)A.静态路由B.直接路由C.缺省路由D.动态路由ANSWER:A C11.关于RIP 协议，下列说法正确的有？(多选)A.RIP 协议是一种IGPB.RIP 协议是一种EGPC.RIP 协议是一种距离矢量路由协议D.RIP 协议是一种链路状态路由协议ANSWER:A C12.下列关于链路状态算法的说法正确的是？(多选)A.链路状态是对路由的描述B.链路状态是对网络拓扑结构的描述C.链路状态算法本身不会产生自环路由D.OSPF 和RIP 都使用链路状态算法ANSWER:B C13.路由器中时刻维持着一张路由表，这张路由表可以是静态配置的，也可以是什么协议产生的？A.生成树协议B.链路控制协议C.动态路由协议D.被承载网络层协议ANSWER:C14.在路由器中，如果去往同一目的地有多条路由，则决定最佳路由的因素有？(多选)A.路由的优先级B.路由的发布者C.路由的metric 值D.路由的生存时间ANSWER:A C15.下面哪一项正确描述了路由协议？A.允许数据包在主机间转送的一种协议B.定义数据包中域的格式和用法的一种方式C.通过执行一个算法来完成路由选择的一个协议D.指定MAC 地址和IP 地址捆绑的方式和时间的一种协议ANSWER:C16.IGP 包括如下哪些协议？(多选)A.RIPB.BGPC.IS-ISD.EIGRPE.OSPFANSWER:A C D E17.RIP 协议引入路由保持机制的作用是？A.节省网络带宽B.防治网络中形成路由环路C.将路由不可达信息在全网扩散D.通知邻居路由器哪些路由是从其处得到ANSWER:B18.对路由理解正确的是？A.路由是路由器B.路由是信息在网络路径的交叉点C.路由是用以配置报文的目的地址D.路由就是指导报文发送的路径信息ANSWER:D19.路由协议RIP，OSPF和静态路由各自得到了条到达目标网络，在CISCO路由器默认情况下，最终选选定哪种路由作为最优路由？A.RIPB.OSPFC.静态路由ANSWER:C20.在RIP 协议中，计算metric 值的参数是？A.MTUB.时延C.带宽D.路由跳数ANSWER:D21.衡量路由算法好坏的原则不包括？A.快速收敛性B.灵活性，弹性C.拓扑结构先进D.选径是否是最佳ANSWER:C22.RIP 协议是基于？A.UDPB.TCPC.ICMPD.Raw IPANSWER:A23.禁止RIP 协议的路由聚合功能的命令是？A.no route ripB.summanyC.no auto summanyD.undo networkANSWER:C24.解决路由环路的方法有？(多选)A.水平分割B.抑制时间C.毒性逆转D.触发更新ANSWER:A B C D25.路由环问题会引起哪些问题？(多选)A.慢收敛B.广播风暴C.路由器重起D.路由不一致ANSWER:A D26.下列哪些路由协议存在路由自环问题？(多选)A.RIPB.IGRPC.OSPFD.IS-ISE.EIGRPANSWER:A B27.关于RIP V1 和RIP V2，下列说法哪些正确？(多选)A.RIP V1 报文支持子网掩码B.RIP V2 报文支持子网掩码C.RIP V2 缺省使用路由聚合功能D.RIP V1 只支持报文的简单口令认证，而RIP V2 支持MD5 认证ANSWER:B C28.在一个运行OSPF 的自治系统之内？(多选)A.骨干区域自身也必须连通的B.非骨干区域自身也必须连通的C.必须存在一个骨干区域（区域号为0）D.非骨干区域与骨干区域必须直接相连或逻辑上相连ANSWER:A C D29.以下关于Rip 路由聚合的说法正确的是？(多选)A.Rip V1 默认支持路由聚合，需要时可以关闭路由聚合功能B.华为Quidway 系列路由器Rip V2 的实现可以关闭路由聚合功能C.Rip V1 不支持子网路由聚合到一个非自然子网路由D.Rip V2 支持子网路由聚合到一个非自然子网路由ANSWER:B C D30.假设有这样的组网实例:两台路由器（假设为RTA 和RTB）通过串口相接，其中RTA 的串口IP 地址是，RTB 的串口IP 地址是，RTA 通过以太口连接的本地局域网的IP 地址是，RTB 通过以太口连接的本地局域网IP 地址是，在上面所有的接口上都启动RIP V1（仅仅RIP V1）协议，那么，下列说法正确的是？(多选)A.在RTA 的本地局域网上的计算机可以访问在RTB 本地局域网上的计算机B.在RTB 的本地局域网上的计算机可以访问在RTA 本地局域网上的计算机C.在RTA 的本地局域网上的计算机不能访问在RTB 本地局域网上的计算机D.在RTB 的本地局域网上的计算机不能访问在RTA 本地局域网上的计算机ANSWER:C D31.根据路由的目的地不同，路由表可被划分为？(多选)A.子网路由B.直连路由C.缺省路由D.主机路由E.静态路由ANSWER:A D32.对路由器A 配置RIP 协议，并在接口S0（IP 地址为路由协议，在全局配置模式下使用的第一条命令是？A.router ripwork allworkworkANSWER:A33.当接口运行在RIP-2 广播方式时，它可以接受的报文有？(多选)A.RIP-1 广播报文B.RIP-1 组播报文C.RIP-2 广播报文D.RIP-2 组播报文ANSWER:A C34.RIP 协议的路由项在多少时间内没有更新会变为不可达？A.90sB.120sC.180sD.240sANSWER:C35.VLSM 的含义是？A.Variable Length Subnet MaskingB.Variable Length Shortest MaskingC.Very Long/Shortest MaskingD.Variable Long Subnet MaskingE.Variable Length Short MeasurementANSWER:A36.距离矢量路由协议使用水平分割（split horizon）技术的目的是什么？(多选)A.避免在毗邻路由器之间产生路由环路B.确保路由更新数据报文沿着接收路线方向发送C.与保持间隔（holddown）机制协同工作，为保持间隔的计算提供更多的可靠性D.代替路由中毒（poison reverse）算法ANSWER:A C37.作为一个网络维护人员，对于OSPF 区域体系机构的原则必须有清楚地了解，下面的论述表达正确的是？(多选)A.所有的OSPF 区域必须通过边界路由器与区域0 相连，或采用OSPF 虚链路B.所有区域间通信必须通过骨干区域0，因此所有区域路由器必须包含到区域0 的路由C.单个区域不能包含没有物理链路的两个区域边界路由器D.虚链路可以穿越stub 区域ANSWER:A B38.支持可变长子网掩码的路由协议有？(多选)A.RIP v1B.RIP v2C.OSPFD.EIGRPANSWER:B C D39.因为在生成路由表的过程中，OSPF 协议需要进行复杂的SPF 算法来计算网络拓扑结构，所以相对距离矢量路由选择协议来说，它需要更大的开销，更多的延迟，更高的CPU 占用率。

2022年CCNA认证试题及答案

2022年CCNA认证试题及答案1、目前，我国应用最为广泛的LAN标准是基于()的以太网标准.(A) IEEE 802.1(B) IEEE 802.2(C) IEEE 802.3(D) IEEE 802.5答案：C参考知识点：现有标准：IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802.3 以太网IEEE 802.4 令牌总线IEEE 802.5 令牌环IEEE 802.8 FDDIIEEE 802.11 无线局域网记住.1-------.5的定义以太网是一种计算机局域网组网技术。

IEEE制定的IEEE 802.3标准给出了以太网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准，如令牌环、FDDI和ARCNET。

以太网的标准拓扑结构为总线型拓扑，但目前的快速以太网(100BASE-T、1000BASE-T标准)为了最大程度的减少冲突，最大程度的提高网络速度和使用效率，使用交换机(Switch)来进行网络连接和组织，这样，以太网的拓扑结构就成了星型，但在逻辑上，以太网仍然使用总线型拓扑的C某某某A/CD介质访问控制方法。

电气电子工程师协会或IEEE(Institute of Electrical and Electronics Engineers)是一个国际性的电子技术与信息科学工程师的协会。

建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万。

专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志，学报，书籍和每年组织300多次专业会议。

IEEE定义的标准在工业界有极大的影响。

下面列出：.3以太网标准802.3--------- 10Base以太网标准802.3u-------- 100Base-T(快速以太网)802.3z-------- 1000Base-某(光纤吉比特以太网)802.3ab-------- 1000Base-T(双绞线吉比特以太网)2、对于这样一个地址,192.168.19.255/20,下列说法正确的是: ( )(A) 这是一个广播地址(B) 这是一个网络地址(C) 这是一个私有地址(D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上(F) 这是一个公有地址答案：CE注：IP地址中关键是看她的主机位，将子网掩码划为二进制，1对应上面的地址是网络位，0对应的地址是主机位192.168.19.255/20划为二进制为：..00010011. (00000000)主机位变成全0表示这个IP的.网络地址主机槐涑扇?表示这个IP的广播地址文件规定了保留作为局域网使用的私有地址：10.0.0.0 - 10.255.255.255 (10/8 prefi某)172.16.0.0 - 172.31.255.255 (172.16/12 prefi某)192.168.0.0 - 192.168.255.255 (192.168/16 prefi某)3、Quidway系列路由器在执行数据包转发时，下列哪些项没有发生变化(假定没有使用地址转换技术)?( )(A) 源端口号(B) 目的端口号(C) 源网络地址(D) 目的网络地址(E) 源MAC地址(F) 目的MAC地址答案：ABCD参考知识点：路由功能就是指选择一条从源网络到目的网络的路径，并进行数据包的转发。

ccna原题

2.7 真题精选***1．Which two topologies are using the correct type of twisted-pair cables? (Choose two.)2．Refer to the exhibit. Two buildings on the San Jose campus of a small company must be connected to use Ethernet with a bandwidth of at least 100 Mbps.The company is concerned about possible problems from voltage potentialdifferences between the two buildings. Which media type should be used for theconnection?A：UTP cable B：STP cable C：coaxial cable D：fiber optic cable3．Refer to the exhibit. Switch1 has just been restarted and has passed the POST routine. Host A sends its initial frame to Host C. What is the first thing the switchwill do as regards populating the switching table?A：Switch1 will add 192.168.23.4 to the switching table.B：Switch1 will add 192.168.23.12 to the switching table.C：Switch1 will add 000A.8A47.E612 to the switching table.D：Switch1 will add 000B.DB95.2EE9 to the switching table.4．Refer to the exhibit. Switch-1 needs to send data to a host with a MAC address of 00b0.d056.efa4. What will Switch-1 do with this data?A：Switch-1 will drop the data because it does not have an entry for that MAC address.B：Switch-1 will flood the data out all of its ports except the port from which the data originated.C：Switch-1 will send an ARP request out all its ports except the port from which the data originated.D：Switch-1 will forward the data to its default gateway.5．Why will a switch never learn a broadcast address?A：Broadcasts only use network layer addressing.B：A broadcast frame is never forwarded by a switch.C：A broadcast address will never be the source address of a frame.D：Broadcast addresses use an incorrect format for the switching table.E：Broadcast frames are never sent to switches.6．What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table?A：The switch will not forward unicast frames.B：The switch will forward the frame to a specific port.C：The switch will return a copy of the frame out the source port.D：The switch will remove the destination MAC from the switch table.E：The switch will forward the frame to all ports except the port on which it was received.7．Which of the following is true regarding the use of switches and hubs for network connectivity?A：Switches take less time to process frames than hubs take.B：Switches do not forward broadcasts.C：Hubs can filter frames.D：Using hubs can increase the amount of bandwidth available to hosts.E：Switches increase the number of collision domains in the network.8．Which of the following statements are true regarding bridges and switches? (Choose 3.)A：Switches are primarily software based while bridges are hardware based.B：Both bridges and switches forward Layer 2 broadcasts.C：Bridges are frequently faster than switches.D：Switches have a higher number of ports than most bridges.E：Bridges define broadcast domains while switches define collision domains.F：Both bridges and switches make forwarding decisions based on Layer 2 addresses.9．What are some of the advantages of using a router to segment the network? (Choose two.)A：Filtering can occur based on Layer 3 information.B：Broadcasts are eliminated.C：Routers generally cost less than switches.D：Broadcasts are not forwarded across the router.E：Adding a router to the network decreases latency.10．What functions do routers perform in a network? (Choose two.)A．packet switching B．access layer securityC．path selection D．VLAN membership assignment E．bridging between LAN segments F．microsegmentation of broadcast domains11．Which of the following statements describe the network shown in the graphic? (Choose two.)A：There are two broadcast domains in the network.B：There are four broadcast domains in the network.C：There are six broadcast domains in the network.D：There are four collision domains in the network.E：There are five collision domains in the network.F：There are seven collision domains in the network.12．Refer to the graphic. How many collision domains are shown?A：one B：two C：threeD：four E：six F：fourteen13．Refer to the exhibit. What two results would occur if the hub were to be replaced with a switch that is configured with one Ethernet VLAN? (Choose two.)A：The number of collision domains would remain the same.B：The number of collision domains would decrease.C：The number of collision domains would increase.D：The number of broadcast domains would remain the same.E：The number of broadcast domains would decrease.F：The number of broadcast domains would increase.14．Which of the following are associated with the application layer of the OSI model? (Choose two.)A：ping B：Telnet C：FTPD：TCP E：IP15．At which OSI layer is a logical path created between two host systems?A：session B：transport C：networkD：data link E：physical16．Why does the data communication industry use the layered OSI reference model? (Choose two.)A：It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.B：It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.C：It supports the evolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers.D：It encourages industry standardization by defining what functions occur at each layer of the model.E：It provides a means by which changes in functionality in one layer require changes in other layers.17．An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21, 23 and 25. What types of packets will be permitted by this ACL? (Choose three.)A：FTP B：Telnet C：SMTPD：DNS E：HTTP F：POP318．DNS servers provide what service?A：Given an IP address, they determine the name of the host that is sought.B：They convert domain names into IP addresses.C：They run a spell check on host names to ensure accurate routing.D：They map individual hosts to their specific IP addresses.19．For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork. Which protocol should be blocked with access control lists?A．IP B．ICMP C．TCP D．UDP20．The user of Host1 wants to ping the DSL modem/router at 192.168.1.254. Based on the Host1 ARP table that is shown in the exhibit, what will Host1 do?A：send a unicast ARP packet to the DSL modem/routerB：send unicast ICMP packets to the DSL modem/routerC：send Layer 3 broadcast packets to which the DSL modem/router responds D：send a Layer 2 broadcast that is received by Host2, the switch, and the DSL modem/router21．Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true? (Choose two.)A：Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.B：Router C will use ICMP to inform Router B that Host 2 cannot be reached.C：Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.D：Router C will send a Destination Unreachable message type.E：Router C will send a Router Selection message type.F：Router C will send a Source Quench message type.22．Refer to the exhibit. A network administrator attempts to ping Host2 from Host1 and receives the results that are shown. What is a possible problem?A：The link between Host1 and Switch1 is down.B：TCP/IP is not functioning on Host1C：The link between Router1 and Router2 is down.D：The default gateway on Host1 is incorrect.E：Interface Fa0/0 on Router1 is shutdown.F：The link between Switch1 and Router1 is down.23．What is the purpose of an ARP request message?A：It binds the IP address of a host to the network that it is on.B：It builds a correlation between an IP address and a MAC address.C：It provides connectivity and path selection between hosts on a network.D：It encapsulates the Layer 3 address and then passes the packet to Layer 2.E：It creates a session by passing a header with the destination Layer 2 address to the transport layer.24．An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC. If a reply is received, what does this confirm?A．The PC has connectivity with a local host.B．The PC has connectivity with a Layer 3 device.C．The PC has a default gateway correctly configured.D．The PC has connectivity up to Layer 5 of the OSI model.E．The PC has the TCP/I P protocol stack correctly installed.25．Acknowledgements, sequencing, and flow control are characteristics of which OSI layer?A：Layer 2 B：Layer 3 C：Layer 4D：Layer 5 E：Layer 6 F：Layer 726．Which of the following are types of flow control? (Choose three.)A：buffering B：cut-through C：windowingD：congestion avoidance E：load balancing27．A TCP/IP transfer is diagrammed in the exhibit.A window size of three has been negotiated for this transfer. Which message will be returned from the receiver to the sender as part of this TCP/IP transfer?A：send ACK 1-3 B：send ACK 3 C：send ACK 4D：send ACK 4-6 E：send ACK 6 F：send ACK 728．Which of the following describe private IP addresses? (Choose two.)A．addresses chosen by a company to communicate with the InternetB．addresses that cannot be routed through the public InternetC．addresses that can be routed through the public InternetD．a scheme to conserve public addressesE．addresses licensed to enterprises or ISPs by an Internet registry organization 29．If an ethernet port on a router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet?A：1024 B：2046 C：4094D：4096 E：819030．Refer to the exhibit. What IP address should be assigned to Workstation A?A．192.168.1.143/28 B．192.168.1.144/28 C．192.168.1.145/28 D．192.168.1.159/28 E．192.168.1.160/2831．The Ethernet networks connected to router R1 in the graphic have beensummarized for router R2 as 192.1.144.0/20. Which of the following packet destination addresses will R2 forward to R1, according to this summary? (Choose two.)A：192.1.159.2 B：192.1.160.11 C：192.1.138.41D：192.1.151.254 E：192.1.143.145 F：192.1.1.144 32．Refer to the exhibit. The networks connected to router R2 have been summarized as a 192.168.176.0/21 route and sent to R1. Which two packet destination addresses will R1 forward to R2? (Choose two.)A：192.168.194.160 B：192.168.183.41 C：192.168.159.2 D：192.168.183.255 E：192.168.179.4 F：192.168.184.45 33．Refer to the exhibit. What is the most efficient summarization that R1 can use to advertise its networks to R2?A：172.1.0.0/22 B：172.1.0.0/21 C：172.1.4.0/22D：172.1.4.0/24 E：172.1.4.0/25172.1.5.0/24 172.1.4.128/25172.1.6.0/24 172.1.5.0/24172.1.7.0/24 172.1.6.0/24172.1.7.0/2434．Refer to the exhibit. The partial frame shown in the exhibit displays select header information as it arrives at the destination host. Which graphic represents the correct header information in the responding frame returned to the remote host?35．Refer to the exhibit. After HostA pings HostB, which entry will be in the ARP cache of HostA to support this transmission?36．Refer to the graphic. Host A has established a connection with the HTTP server attached to interface E0 of the xyz router. Which of the following statements describe the information contained in protocol data units sent from host A to this server? (Choose three.)A：The destination port number in a segment header will have a value of 80.B：The destination port number in a segment header will have a unique value greater than or equal to 1023.C：The destination address of a frame will be the MAC address of the HTTP server interface.D：The destination address of a frame will be the MAC address of the E0 interface of the abc router.E：The destination IP address of a packet will be the IP address of the E0 interface of the abc router.F：The destination IP address of a packet will be the IP address of the network interface of the HTTP server.37．Refer to the exhibit. What is the correct addressing for a frame and packet received by Host B from Host A?A：Destination MAC: 0011.43da.2c98 B：Destination MAC: 0011.43da.2c98Source MAC: 0070.0e8f.088a Source MAC: 00b0.d0ef.5f6aDestination IP: 192.168.60.5 Destination IP: 192.168.60.5Source IP: 192.168.24.5 Source IP: 192.168.24.5 C：Destination MAC: 0011.43da.2c98 D：Destination MAC: 0011.43da.2c98Source MAC: 0070.0e8f.088a Source MAC: 0070.0e97.af4e Destination IP: 192.168.60.5 Destination IP: 192.168.60.5Source IP: 192.168.60.1 Source IP: 192.168.60.2 38．Host 1 sends a request for a file to remote sever1. Which destination address does Host 1 place f the packet containing the request?题38—42均使用本题中的图。

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CCNA测试真题1 要求公司进行IP子网规划，内网网段是192.168.1.0/24，进行一下子网划分router1下面有120个PCrouter2下面有60个PCrouter3下面有28个PCrouter4下面有12个PC要求PC都能自动获得地址，并且只有router0是DHCP服务器，DNS地址是10.10.10.100 router0，router1,router2,router3,router4的互联地址也在192.168.1.0/24这个子网。

解决方案：根据题目的要求，进行子网划分router1 是192.168.1.0/25 网关地址192.168.1.1router2 是192.168.1.128/26 网关地址192.168.1.129router3 是192.168.1.192/27 网关地址192.168.1.193router4 是192.168.1.224/28 网关地址192.168.1.225直连地址：router0*router1 :地址192.168.1.241/30 *192.168.1.242/30router0*router2 :地址192.168.1.245/30 *192.168.1.246/30router0*router3 :地址192.168.1.249/30 *192.168.1.250/30router0*router4 :地址192.168.1.253/30 *192.168.1.254/30配置：Router0(config)#int s0/3/0Router0(config-if)#no shRouter0(config-if)#ip add 192.168.1.241 255.255.255.252Router0(config-if)#int s0/3/1Router0(config-if)#no shRouter0(config-if)#ip add 192.168.1.245 255.255.255.252Router0(config-if)#int s0/2/0Router0(config-if)#no shRouter0(config-if)#ip add 192.168.1.249 255.255.255.252Router0(config-if)#int s0/2/1Router0(config-if)#no shRouter0(config-if)#ip add 192.168.1.253 255.255.255.252Router1(config)#int g0/0Router1(config-if)#no shRouter1(config-if)#ip add 192.168.1.1 255.255.255.128Router1(config-if)#int s0/3/0Router1(config-if)#no shRouter1(config-if)#ip add 192.168.1.242 255.255.255.252Router2(config)#int g0/0Router2(config-if)#no shRouter2(config-if)#ip add 192.168.1.129 255.255.255.192 Router2(config)#int s0/3/0Router2(config-if)#no shRouter2(config-if)#ip add 192.168.1.246 255.255.255.252Router3(config)#int g0/0Router3(config-if)#no shRouter3(config-if)#ip add 192.168.1.193 255.255.255.224 Router3(config-if)#int s0/3/0Router3(config-if)#no shRouter3(config-if)#ip add 192.168.1.250 255.255.255.252Router4(config-if)#int g0/0Router4(config-if)#ip add 192.168.1.225 255.255.255.240 Router4(config-if)#no shRouter4(config-if)#int s0/3/0Router4(config-if)#ip add 192.168.1.254 255.255.255.252 Router4(config-if)#no sh配置rip路由,在这5个路由器上都去宣告RIP路由，router ripversion 2network 192.168.1.0no auto-summary保证网络能进行畅通接下来在router0上配置DHCP服务器Router0(config)#ip dhcp pool router1Router0(dhcp-config)#network 192.168.1.0 255.255.255.128 Router0(dhcp-config)#default-router 192.168.1.1Router0(dhcp-config)#dns-server 10.10.10.100Router0(dhcp-config)#exRouter0(config)#ip dhcp excluded-address 192.168.1.1Router0(config)#ip dhcp pool router2Router0(dhcp-config)#network 192.168.1.128 255.255.255.192 Router0(dhcp-config)#default-router 192.168.1.129Router0(dhcp-config)#dns-server 10.10.10.100Router0(dhcp-config)#exRouter0(config)#ip dhcp excluded-address 192.168.1.129Router0(config)#ip dhcp excluded-address 192.168.1.132//R2下面连接的服务器地址Router0(config)#ip dhcp pool router3Router0(dhcp-config)#network 192.168.1.192 255.255.255.224Router0(dhcp-config)#default-router 192.168.1.193Router0(dhcp-config)#dns-server 10.10.10.100Router0(dhcp-config)#exRouter0(config)#ip dhcp excluded-address 192.168.1.193Router0(config)#ip dhcp pool router4Router0(dhcp-config)#network 192.168.1.224 255.255.255.240Router0(dhcp-config)#default-router 192.168.1.225Router0(dhcp-config)#dns-server 10.10.10.100Router0(dhcp-config)#exRouter0(config)#ip dhcp excluded-address 192.168.1.225接下在router1--router4上配置DHCP的中继Router1(config)#int g0/0Router1(config-if)#ip helper-address 192.168.1.241Router2(config-router)#int g0/0Router2(config-if)#ip helper-address 192.168.1.245Router3(config)#int g0/0Router3(config-if)#ip helper-address 192.168.1.249Router4(config)#int g0/0Router4(config-if)#ip helper-address 192.168.1.2532 要求对router0进行密码恢复解决：进行密码恢复，把router0断电重启，重启的过程中按ctrl break rommon 1 > confreg 0x2142rommon 2 > bootContinue with configuration dialog? [yes/no]: nRouter>enRouter#copy startup-config running-configDestination filename [running-config]?Center#conf tCenter(config)#no enable passwordCenter(config)#no enable secretCenter(config)#config-register 0x2102Center(config)#do wr3 要求对router2进行IOS的恢复解决：首先要给服务器去配置一个临时地址1.1.1.1/24在配置tftpdnld的时候，给路由器去设置临时地址是1.1.1.100/24发现模拟器上的Server上不存在29系列的IOS，所以先让服务器去复制一个IOS，去router1上复制。

把服务器的线连临时性的连接到router1，接下来执行的是从router1上下载一个IOS到服务器Router#conf tRouter(config)#int g0/0Router(config-if)#ip add 1.1.1.2 255.255.255.0Router(config-if)#no shRouter#copy flash: tftp:Source filename []? c2900-universalk9-mz.SPA.151-4.M4.binAddress or name of remote host []? 1.1.1.1Destination filename [c2900-universalk9-mz.SPA.151-4.M4.bin]?复制完成后，服务器上有操作系统,然后再把物理线路恢复。

回到router2上进行tftpdnld的配置rommon 2 > IP_ADDRESS=1.1.1.100rommon 3 > IP_SUBNET_MASK=255.255.255.0rommon 4 > DEFAULT_GATEWAY=1.1.1.1rommon 5 > TFTP_SERVER=1.1.1.1rommon 6 > TFTP_FILE=c2900-universalk9-mz.SPA.151-4.M4.binrommon 13 > tftpdnld发现复制数据超时，分析原因是由于端口启用了生成树，所以端口从阻塞进入转发状态，需要30S的时间解决方法：可以服务器直连路由器或者在交换机上把连接路由器的端口设置为portfast在switch1上面配置Switch(config-if)#int fa0/1Switch(config-if)#spanning-tree portfast然后在router2上执行rommon 13 > tftpdnldrommon 15 > boot完成后，删除交换机上的命令Switch(config-if)#int fa0/1Switch(config-if)#no spanning-tree portfast4 multilayer switch1进行VLAN的划分，并实现VLAN10和VLAN20的流量转发在multilayer switch1上进行一下配置Switch(config)#vlan 10Switch(config-vlan)#vlan 20Switch(config-vlan)#int vlan 10Switch(config-if)#ip add 10.10.10.1 255.255.255.0Switch(config-if)#int vlan 20Switch(config-if)#ip add 20.20.20.1 255.255.255.0Switch(config)#ip routingSwitch(config)#int fa0/3Switch(config-if)#sw tr en dSwitch(config-if)#sw mo tr接下来配置地下的接入交换机，也就是switch4Switch(config)#vlan 10Switch(config-vlan)#vlan 20Switch(config-vlan)#int fa0/1Switch(config-if)#sw mo trSwitch(config-if)#int fa0/2Switch(config-if)#sw mo acSwitch(config-if)#sw ac v 10Switch(config-if)#int fa0/3Switch(config-if)#sw mo acSwitch(config-if)#sw ac v 20接下来配置服务器的地址和网关后，可以ping通5 router0和router7之间是企业的专线，要求使用PPP的CHAP的双向认证，密码是CCIE Router0(config)#username Router7 password CCIERouter0(config)#int s0/1/0Router0(config-if)#ip add 172.16.14.1 255.255.255.0Router0(config-if)#encapsulation pppRouter0(config-if)#ppp authentication chapRouter0(config-if)#no shRoter7(config)#hostname Router7Router7(config)#int s1/0Router7(config-if)#no shRouter7(config-if)#encapsulation pppRouter7(config-if)#ppp authentication chapRouter7(config-if)#ip add 172.16.14.4 255.255.255.0Router7(config)#username Router0 password CCIE配置完成后router0和router7进行ping测试6 在router8和multilayer switch1模拟ISP，要求运行ospf协议在多层交换机配置Switch(config)#int fa0/1Switch(config-if)#no swSwitch(config-if)#ip add 202.101.12.2 255.255.255.0Switch(config-if)#int fa0/2Switch(config-if)#no swSwitch(config-if)#ip add 202.101.23.2 255.255.255.0Switch(config-if)#router ospf 1Switch(config-router)#net 202.101.12.2 0.0.0.0 a 0Switch(config-router)#net 202.101.23.2 0.0.0.0 a 0Switch(config-router)#net 10.10.10.1 0.0.0.0 a 0Switch(config-router)#net 20.20.20.1 0.0.0.0 a 0另外一个路由器配置Router(config)#int g0/0Router(config-if)#no shRouter(config-if)#ip add 202.101.23.3 255.255.255.0Router(config-if)#int g0/1Router(config-if)#no shRouter(config-if)#ip address 30.30.30.1 255.255.255.0Router(config-if)#int g0/2Router(config-if)#no shRouter(config-if)#ip add 202.101.34.3 255.255.255.0Router(config-if)#router ospf 1Router(config-router)#net 30.30.30.1 0.0.0.0 a 0Router(config-router)#net 202.101.23.3 0.0.0.0 a 0Router(config-router)#net 202.101.34.3 0.0.0.0Router(config-router)#net 202.101.34.3 0.0.0.0 a 0Router(config)#ip dhcp pool abcRouter(dhcp-config)#network 30.30.30.0 255.255.255.0Router(dhcp-config)#default-router 30.30.30.1Router(dhcp-config)#exRouter(config)#ip dhcp excluded-address 30.30.30.1配置完成后可以30.30.30网段的PC可以ping 10.10.10.1007 在router0上面配置去往互联网的默认路由Router0(config)#int g0/0Router0(config-if)#no shRouter0(config-if)#ip add 202.101.12.1 255.255.255.0Router0(config-if)#ip route 0.0.0.0 0.0.0.0 202.101.12.28 要求在router0上面配置NAT，要求PC能进行正常访问互联网Router0(config)#int g0/0Router0(config-if)#ip nat outsideRouter0(config-if)#int s0/2/0Router0(config-if)#ip nat insideRouter0(config-if)#int s0/2/1Router0(config-if)#ip nat insideRouter0(config-if)#int s0/3/0Router0(config-if)#ip nat insideRouter0(config-if)#int s0/3/1Router0(config-if)#ip nat insideRouter0(config)#access-list 1 deny host 192.168.1.132Router0(config)#access-list 1 permit 192.168.1.0 0.0.0.255Router0(config)#ip nat inside source list 1 interface g0/0 overloadRouter0(config)#router ripRouter0(config-router)#default-information originate 给其他路由器去通过RIP下发默认路由配置完成后可以PC可以ping通10.10.10.1009 要求router2下面的server采用固定地址，能被互联网的设备访问到该服务器的web服务服务器的地址设置为192.168.1.132Router0(config)#ip nat inside source static tcp 192.168.1.132 80 202.101.12.1 8010 要求企业总部和企业分部之间运行RIP协议Router0(config)#router ripRouter0(config-router)#ve 2Router0(config-router)#net 172.16.0.0Router7(config)#router ripRouter7(config-router)#ve 2Router7(config-router)#no auRouter7(config-router)#net 172.16.0.0Router7(config-router)#net 192.168.5.0Router7(config-router)#net 192.168.6.011 要求在企业分布之间配置VLAN，trunk,VTP和STP，要求switch8是企业的核心设备，成为STP的root，成为VTP的server,其他设备是VTP的client。