思科第二学期第一章答案

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ccna第二学期第一章考试答案解析

2017C C N A第二学期第一章考试答案解析(总9页)以下是针对您未获得满分的试题给出的反馈。

某些交互式试题可能不显示您的答案。

分项分数：?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?1 与固定配置的交换机相比，模块化交换机具有哪两个优点（请选择两项。

）正确? 响应? 您的? 响应?每台交换机的成本更低可扩展性更高转发率更低需要的电源插座数目更少带宽聚合可以使用多个端口固定配置交换机价格较低，但是它具有指定数量的端口且不能添加端口。

它们提供的高速端口通常比较少。

为了在包含固定配置交换机的网络上扩展交换，需要购买更多的交换机。

这增加了需要使用的电源插座数量。

模块化交换机只需要购买额外的线卡便可以扩展。

带宽聚合也更容易，因为机箱的背板可以为交换机端口线卡提供所需的带宽。

此试题参考以下领域的内容：Routing and Switching Essentials交换网络2 思科无边界架构接入层的基本功能是什么？正确? 响应? 您的? 响应?聚合第 2 层广播域聚合第 3 层路由边界为用户提供访问权提供高可用性思科无边界架构接入层的功能是为用户提供网络访问。

第 2 层广播域聚合、第 3 层路由边界聚合和高可用性是分布层的功能。

也有说答案是聚合第 3 层路由边界此试题参考以下领域的内容：Routing and Switching Essentials融合网络3 思科无边界架构分布层的基本功能是什么？正确? 响应? 您的? 响应?充当主干聚合所有园区块聚合第 3 层路由边界为用户提供访问权思科无边界架构的分布层的一项基本功能是在不同的 VLAN 之间路由。

充当主干和聚合园区块是核心层的功能。

为用户提供访问是接入层的功能。

此试题参考以下领域的内容：Routing and Switching Essentials融合网络4若将大端口密度、容错和低价作为重要指标，应使用哪个交换机外形因素？正确? 响应?您的?响应?固定配置交换机模块化交换机可配备机架的1U 交换机可堆叠式交换机堆叠式交换机可以使用特殊电缆实现互联，从而在交换机之间提供高带宽的吞吐量，并像单个大型交换机一样运行。

思科第二学期期末试题及答案

Close WindowAssessment System 1. Assessment Selection 2. Assessment Settings 3. Take Assessment 1Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2? 192.168.1.0/24 192.168.0.0/24 192.168.0.0/22 192.168.1.0/22 2If a router is booting with its default configuration register setting and its NVRAM lacks boot system commands, from try to load the IOS image first? ROM RAM NVRAM f lash flash TFTP server 3Refer to the exhibit. A network administrator adds this command to router R1: ip route 192.168.2.0 255.255.255.0 S0/0/0. result of adding this command? This route is automatically propagated throughout the network. The traffic for network 172.16.1.0 is forwarded to network 192.168.2.0. A static route is established. A static route is established. The traffic for all Class C networks is forwarded to 172.16.1.2. 4Which two technologies can be used in distance vector routing protocols to prevent routing loops? (Choose two.) authentication link-state advertisements h old-down timers hold-down timers Spanning Tree Protocol split horizon 5Refer to the exhibit. What information can be determined from the displayed output? E IGRP packets are waiting to be sent to the neighbors. EIGRP packets are waiting to be sent to the neighbors. The adjacencies between the routers are yet to be established. The IP address 192.168.10.10 is configured at serial interface S0/0/1 of router R2. Router R2 is receiving hello packets from a neighbor with the IP address 192.168.10.10 via the R2 S0/0/1 interf6Which statement is true about the metrics used by routing protocols? A metric is a value used by a particular routing protocol to compare paths to remote networks. A metric is a value used by a particular routing protocol to compare paths to remote networks. A common metric is used by all routing protocols. The metric with the highest value is installed in the routing table. The router may use only one parameter at a time to calculate the metric. 7Which feature of RIPv2 enables it to function as a classless routing protocol? Subnet masks are included in routing updates. Routing updates are triggered by topology changes. Next-hop addresses are included in routing updates. N ext-hop addresses are included in routing updates. Multicast addresses are used to send routing updates. 8Refer to the exhibit. The hosts on the R1 LAN are unable to access the Internet. What is incorrectly configured? the IP address of the Fa0/0 interface at R1 t he IP address of the Fa0/0 interface at R1 the IP address of the S0/0/1 interface at R2 the IP address of the S0/0/0 interface at R1 the subnet mask of the S0/0/1 interface at R2 9Which prompt is used to allow a user to change the IP address of an interface on a router? Router> R outer> Router# Router(config)# Router(config-if)# 10Refer to the exhibit. The interfaces of all routers are configured for OSPF area 0. R3 can ping R1, but the two routeestablish a neighbor adjacency. What should the network administrator do to troubleshoot this problem? Check if the interfaces of the routers are enabled. Check the hello and dead intervals between the routers. C heck the hello and dead intervals between the routers. Check the process ID of both routers. Check if CDP is enabled on all the routers. 11Refer to the exhibit. Which combination of IP address and subnet mask can be used on the serial interface of Route interface in the same network as the serial interface of Router1? IP 172.16.0.18, subnet mask 255.255.255.0 IP 172.16.32.15, subnet mask 255.255.255.240 I P 172.16.32.15, subnet mask 255.255.255.240 IP 172.16.0.18, subnet mask 255.255.255.252 IP 172.16.32.18, subnet mask 255.255.255.252 12Refer to the exhibit. A network engineer has run the show version command on R3. Upon rebooting, R3 does not load configuration settings. What could be the cause of this problem? There is insufficient NVRAM. There is insufficient flash memory. The configuration register is not configured with the default setting. The system image file is not located in NVRAM. 13Refer to the exhibit. On the basis of the show running-config output, which option correctly reflects the routes that will b routing table? 14Refer to the exhibit. Host A is having problems accessing server A. All routers have the same EIGRP configuration a What should be done so that host A can access server A? Add the command n ono auto-summary on all routers. Change the network statements to include a wildcard mask. Adjust the EIGRP hello timers to account for the network delay. Add the command e igrpeigrp log-neighbor-changes on all routers. 15Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statement is the routers in this topology will respond to this event? Router4 will learn about the failed route 30 seconds later in the next periodic update. Split horizon will prevent Router4 from fowarding packets to the 10.0.0.0 network until the holddown timer expire Router5 immediately flushes the unreachable route from its routing table. Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0. 16A network administrator is in charge of two separate networks that share a single building. What device will be require networks and add a common connection to the Internet that can be shared? hub router access point Ethernet switch E thernet switch 17Refer to the exhibit. A network administrator has configured OSPF using the following command: network 192.168.1.32 0.0.0.31 area 0Which router interface will participate in OSPF? FastEthernet0/0 FastEthernet0/1 Serial0/0/0 Serial0/0/1 18Refer to the exhibit. R1 is configured properly for a single area OSPF, and R2 has been recently installed in the netcommands is required to configure a single area OSPF for the networks that are connected to R2? R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config)# router ospf 2R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 1R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.0.0.0 0.0.0.3 area 119Which two statements are true for link-state routing protocols? (Choose two.) Routers that run a link-state protocol can establish a complete topology of the network. Routers in a multipoint network that run a link-state protocol can exchange routing tables. Routers use only hop count for routing decisions. The shortest path first algorithm is used. Split horizon is used to avoid routing loops. 20Which candidate route has the longest match for a packet with a destination address of 10.30.16.48? 10.30.0.0/16 10.30.15.0/23 10.30.16.0/24 10.30.16.32/27 10.30.16.32/30 21Which statement is true about the RIPv1 protocol? It is a link-state routing protocol. It excludes subnet information from the routing updates. It uses the DUAL algorithm to insert backup routes into the topology table. It uses classless routing as the default method on the router. 22Which of the following are primary functions of a router? (Choose two.) packet switching microsegmentation domain name resolution path selection flow control 23Refer to the exhibit. Partial results of the show running-config and s how show ip route commands are displayed. Router B rec with a destination address of 10.16.1.97. What will router B do? drop the packet forward the packet via the route to 10.16.1.0 f orward the packet via the route to 10.16.1.64 forward the packet via the route to 10.16.1.64 use the default route 24 What are two ways that a router can learn of the paths to destination networks? (Choose two.) updates from other routers DHCP information broadcasts m anual configuration of routes manual configuration of routes ARP requests from connected routers inspection of the destination IP address in data packets updates from the SMTP management information base 25Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this? The IP address of host A is incorrect. The default gateway of host A is incorrect. The Fa0/1 interfaces of the two routers are configured for different subnets. T he Fa0/1 interfaces of the two routers are configured for different subnets. The subnet mask for the Fa0/0 interface of R1 is incorrect. 26A network administrator is analyzing routing update behavior on a network that has both EIGRP and OSPF configured protocols appear in the output of show ip protocols. However, only EIGRP internal routes appear in the routing tables. correctly explains the scenario? The OSPF protocol has a higher cost than EIGRP. T he OSPF protocol has a higher cost than EIGRPThe EIGRP protocol has a lower metric than OSPF. The EIGRP protocol was configured first on the router. The EIGRP protocol has a lower administrative distance than OSPF. 27Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are d are operational and pings are not blocked on this network. Which ping will fail? from R1 to 172.16.1.1 from R1 to 192.168.3.1 from R2 to 192.168.1.1 from R2 to 192.168.3.1 28Refer to the exhibit. A device is required to complete the connection between router R1 and the WAN. Which two de this? (Choose two.) a CSU/DSU device a modem a n Ethernet switch an Ethernet switch a hub a bridge 29 In which situation would a default static route be recommended? when connecting an edge router to the Internet w hen variable length subnet masking is in effect when variable length subnet masking is in effect when there is more than one valid route for a destination network when a destination network has a larger mask than any routes in the routing table 30 Two routers need to be configured within a single OSPF area. Which two components need to be configured on boththis? (Choose two.) t he same process ID the same process ID the same area ID network addresses and wildcard masks the same router ID the same loop back address 231Refer to the exhibit. What is the meaning of the highlighted value 120? It is the metric that is calculated by the routing protocol. It is the value that is used by the DUAL algorithm to determine the bandwidth for the link. It is the administrative distance of the routing protocol. It is the hold-down time, measured in seconds, before the next update. 32Refer to the exhibit. A router learns a route to the 192.168.6.0 network, as shown in the output of the show ip rip database However, upon running the show ip route command, the network administrator sees that the router has installed a diff command, the network administrator sees that the router has installed a diffe 192.168.6.0 network learned via EIGRP. What could be the reason for the missing RIP route? Compared to RIP, EIGRP has a lower administrative distance. Compared to EIGRP , RIP has a higher metric value for the route. Compared to RIP , the EIGRP route has fewer hops. Compared to RIP , EIGRP has a faster update timer. 33 Which mechanism helps to avoid routing loops by advertising a metric of infinity? route poisoning split horizon hold-down timer triggered updates 34 A network administrator must use the subnet 172.16.128.0/18 to create 6 additional subnets each containing up to 20LANs. Which subnet mask should the administrator use to create the new subnets? 255.255.224.0 255.255.240.0 255.255.248.0 255.255.252.0 35 A technician configures the Fa0/0 interface on a router with ip address 192.168.3.5 255.255.255.252. What additional com. What additional com issued by the technician to activate the interface to forward traffic? Router(config-if)# exitRouter(config-if)# no shutdownRouter(config-if)# clock rateRouter# copy running-config startup-config36 Because of a topology change, the next hop IP address in the current static route must be reconfigured. How can a altered to accommodate a topology change? Keep the existing static route and configure a new static route with the correct next hop IP address. Negate the existing static route and configure a new static route with the correct next hop IP address. D o nothing. The existing static route will automatically update the next hop entry with the new IP address. Do nothing. The existing static route will automatically update the next hop entry with the new IP address. Keep the existing static route, reload the router, and configure a new static route with the correct next hop IP a37Refer to the exhibit. What needs to be done to allow these two routers to connect successfully? Add a clock rate to S0/0/0 on R1. Add an interface description to S0/0/1 on R2. C hange the serial interface on R2 to S0/0/0 so that it matches R1. Change the serial interface on R2 to S0/0/0 so that it matches R1. Change the IP address of S0/0/1 on R2 so that it is in the same subnet as R1. 38Refer to the exhibit. The network administrator has run the following command on R1. R1(config)# ip route 192.168.2.0 255.255.255.0 172.16.1.2What is the result of running this command? Traffic for network 192.168.2.0 is forwarded to 172.16.1.2. This route is automatically propagated throughout the entire network. Traffic for all networks is forwarded to 172.16.1.2. The command invokes a dynamic routing protocol for 192.168.2.0. 39 Why is fast convergence desirable in networks that use dynamic routing protocols? Hosts are unable to access their gateway until the network is converged. Routers will not allow packets to be forwarded until the network is converged. Routers may make incorrect forwarding decisions until the network has converged. Routers will not allow configuration changes to be made until the network has converged. 40Refer to the exhibit. When all of the commands that are shown in the exhibit are entered at the correct router promp the router? name cisco router hostname 41Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (C10.0.0.0/8 64.100.0.0/16 128.107.0.0/16 172.16.40.0/24 192.168.1.0/24 192.168.2.0/24 42Refer to the exhibit. A router interface is configured with the command ip address 172.16.3.31 255.255.192.0. Which set o. Which set o values would allow a computer that is connected to the router interface to communicate with remote networks? A: 172.16.3.254 A: 172.16.3.254 B: 255.255.192.0 C: 172.16.3.31 A: 172.16.3.31 B: 255.255.192.0 C: 172.16.3.255 A: 172.16.3.254 B: 255.255.255.0 C: 172.16.3.31 A: 172.16.3.31 B: 255.255.255.0 C: 172.16.3.1 43Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through three.) The router modifies the TTL field, decrementing it by one. The router changes the source IP to the IP of the exit interface. The router maintains the same source and destination IP. The router changes the source physical address to the physical address of the exit interface. The router changes the destination IP to the IP of the exit interface. The router sends the packet out all other interfaces, besides the one it entered the router on. 44Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three.) The route to network 172.16.0.0 has an AD of 156160. Network 192.168.0.16 can best be reached using FastEthernet0/0. The AD of EIGRP routes has been manually changed to a value other than the default value. Router1 is running both the EIGRP and OSPF routing process. Network 172.17.0.0 can only be reached using a default route. No default route has been configured. N o default route has been configured. 45Refer to the exhibit. Which route will be installed in the routing table on R1 to forward traffic from PC1 to the web s the static route the route learned via OSPF the route learned via EIGRP both routes learned via OSPF and EIGRP 46Refer to the exhibit. Based on the partial output in the exhibit, why can users establish a console connection to this r a password? The login command was not entered on the console line. The enable password should be an enable secret password. No username and password combination has been configured. Console connections cannot be configured to require users to provide passwords. 47Refer to the exhibit. Which path will traffic from the 172.16.1.0/24 network take to get to the 10.0.0.0/24 network? ADC ABC It will load balance the traffic between ADC and ABC It will send the traffic via ABC, and will use ADC as a backup path only when ABC fails. 48A router learns about network 192.168.10.128/27 from multiple sources. Which option represents the best route and w routing table? S 192.168.10.128/27 [1/0] via 192.168.10.226 R 192.168.10.128/27 [120/2] via 192.168.10.226, 00:00:14, Serial0/0/0 O 192.168.10.128/27 [110/1563] via 192.168.10.226, 00:00:09, Serial0/0/0 D 192.168.10.128/27 [90/21026560] via 192.168.10.226, 00:00:16, Serial0/0/0 49Refer to the exhibit. R1 and R2 are adjacent routers both running RIP. All interfaces on both routers are correctly cothe routing table. What is the likely cause? The adjacent interfaces are passive. The distance of 120 exceeds 15 hops. R2 will not accept version 1 updates from R1. Routes are being summarized by R1 but not by R2. 50It is saved in the topology table for use if the primary route fails. It may be backed up by a feasible successor route. It is used by EIGRP to forward traffic to the destination. It is flagged as active in the routing table. After the discovery process has occurred, the successor route is stored in the neighbor table. 51Refer to the exhibit. PC1 is unable to access the Internet. What is the cause of the problem? An incorrect IP address is configured between the two routers. No static route is configured on Router2. A routing loop has occurred. No routing protocol is configured on either of the two routers. 52Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that inte FastEthernet0/1 is not functioning. Which action will most likely correct the problem with FastEthernet0/1? A clock rate should be added to the interface configuration. The subnet mask should be added to the interface configuration. An interface description needs to be added to the interface configuration. The no shutdown command needs to be added to the interface configuration. 。

CISCO第二学期期末考试答案

客户向ISP 技术人员反映连通性问题。

技术人员就相关问题询问客户之后，发现除了FTP 外，所有网络应用程序都正常。

技术人员怀疑出现了什么问题？防火墙配置有误/ 交换机或集线器端口损坏）/I n t e r n e t服务器将把数据发送至客户端端口8547。

/ 端口过滤和访问列表通过什么方式来增强网络安全？防止特定类型的通信到达特定网络主机。

/遭受各类拒绝服务攻击时提醒网络管理员。

防止病毒、蠕虫和特洛伊木马感染主机计算机和服务器。

可对机密数据通信进行加密和身份认证。

某黑客尝试获取存储在公司网络内部某台服务器上的机密信息。

网络安全解决方案检测完整的数据包，确定这是一个威胁，所以阻止该数据包进入内部网络。

这一过程中哪项安全措施保护了网络？IDSIPS /基于主机的防火墙此命令是从哪一台路由器执行的？ABC /D请参见图示。

网络管理员使用以下命令在RTB 上配置了一条默认路由：RTB(config)# ip route 0.0.0.0 0.0.0.0 fa0/0PC3 可以成功ping 通RTB。

但是当从PC3 发出的回应请求数据包到达PC1 后，却没有应答返回PC3。

怎样解决此问题？必须对RTA 进行配置，使其可以将数据包转发至192.168.2.0 网络。

需要修改ip route 命令，以便将下一跳地址设置为10.1.1.5。

/OSPFEIGRPRIPBGP /下列关于FTP 协议被动数据连接的说法中哪一项正确？服务器发起数据传输连接。

服务器将其IP 地址和一个随机端口号通过控制流转发给FTP 客户端。

/防火墙不会允许与网络内的主机进行被动数据连接。

客户端将数据转发至服务器的端口21。

下列关于反向查找DNS 区域的说法中哪一项正确？将会降低网络速度。

可对传输中的数据进行加密。

当路由协议交换有关直连网络的信息时，哪种路由将自动添加到邻居路由器的路由表中？动态路由/静态路由默认路由直连路由哪项网络地址和子网掩码的组合可使每个子网连接62 台主机？网络地址10.1.1.4 子网掩码255.255.255.240网络地址10.1.1.0 子网掩码255.255.255.252网络地址10.1.1.0 子网掩码255.255.255.192 /是一种可靠的传输协议。

思科第二期考试试题及答案(正确率100%)

参加考试 - ERouting Final Exam - ${COURSENAME} (版本 ${VERSION}) 窗体顶端剩余时间:窗体底端1窗体顶端请参见图示。

哪台路由器会通告子网 172.16.1.32/28？Router1Router2Router3Router4窗体底端窗体顶端请参见图示。

所有路由器都运行相同的路由协议。

根据图示及其显示的命令，下列哪一项叙述正确？通配符掩码配置有误。

必须在每台路由器上配置默认路由。

路由器 B、C 和 D 无法访问 Internet。

路由协议进程未通告通往 ISP 的链路。

窗体底端3 窗体顶端请参见图示。

所有路由器都运行 RIPv1。

10.1.1.0/29 和 10.1.1.16/29 这两个网络无法互相访问。

此问题的原因可能是什么？因为 RIPv1 是无类协议，不支持该访问。

RIPv1 不支持不连续网络。

RIPv1 不支持负载均衡。

RIPv1 不支持自动总结。

窗体底端窗体顶端请参见图示。

路由器 R1 和 R2 通过其串行接口直接相连，并且都在运行 EIGRP 路由协议。

R1 和 R2 可以 ping 通其邻居的直连串行接口，但无法与邻居建立起EIGRP 相邻关系。

应采取什么措施来解决此问题？启用两台路由器的串行接口。

配置 EIGRP 以发送定期更新。

在路由器之间配置相同的 hello 发送间隔。

使用相同的 EIGRP 进程 ID 配置两台路由器。

窗体底端5窗体顶端请参见图示。

对于发往 192.168.2.0 的数据包，R2 会采取什么操作？它会丢弃数据包。

它会通过 S0/0/0 接口转发数据包。

它会通过 Fa0/0 接口转发数据包。

它会将数据包转发给 R1。

窗体底端窗体顶端请参见图示。

为实施 RIPv2 协议，网络管理员运行了所示命令。

但是， show ip protocol 命令未显示任何输出。

管理员应如何解决该命令没有输出的问题？添加 default-information originate 命令。

思科 cisco 课后习题答案

分界点：
19．调制解调器：语音调制解调器将计算机生成的数字信号转换为可通过公共电话网络的模拟线路传输的语音频率；速度越快的调制解调器（如有线电视调制解调器和 DSL 调制解调器）在传输时使用的带宽频率也越高。 CSU/DSU：数字线路（如 T1 或 T3 线路）需要信道服务单元（CSU）和数据服务单元（DSU）；这两者经常合并到一台设备中，名为 CSU/DSU； CSU 端接数字信号，并通过纠错和线路监视确保连接的完整性； DSU 在 T 载波线路帧和 LAN 能够解释的帧之间进行转换。接入服务器：集中处理拨入和拨出用户通信。接入服务器可同时有模拟和数字接口，能够同时支持数百名用户。 WAN 交换机：运营商网络中使用的多端口互连设备。这些设备通常交换帧中继、ATM 或 X.25 等数据流。路由器：提供用于连接服务提供商网络的网络互联接口和 WAN 接入接口。这些接口可以是串行接口或其他 WAN 接口。有些类型的 WAN 接口需要通过 DSU/CSU 或调制解调器（模拟、有线电视或 DSL）等外部设备将路由器连接到服务提供商。 20. X.25：一种低带宽的老式 WAN 技术，最大速度为 48kbit/s，读卡器通常使用拨号模式 X.25 向中央计算机验证事务；对这些应用来说，低带宽和高延时并不是问题，而低成本让 X.25 成为众家之选；很多服务提供商已使用帧中继代替 X.25。一种第 2 层 WAN 协议，通常提供 4Mbit/s 或更高的数据速度；使用虚电路提供永久、共享的中等带宽连接，可同时传输语音和数据； VC 由 DLCI 唯一标识，这确保两台 DTE 设备之间能够进行双向通信。异步传输模式（ATM）技术是一种基于信元而不是帧的架构，使用 53 字节的定长信元；这些小型定长信元非常适合传输对延迟敏感的语音和视频数据流。

思科第2学期第1章答案

1 企业级设备的哪两个功能有助于企业网络维持 99.999% 的正常运行？（请选择两项。

）故障切换功能折叠核心冗余电源故障域服务模块答案说明最高分值correctness of response Option 1 and Option 3 are correct. 22请参见图示。

当交换机 S3 断电时，故障域中存在哪些设备？S4 和PC_2PC_3 和AP_2AP_2 和 AP_1PC_3 和PC_2S1 和 S4答案说明最高分值correctness of response Option 2 23 哪个设计特点将限制企业网络中故障域的大小？使用折叠核心设计使用建筑物交换块方法安装冗余电源购买专门用于大流量的企业设备答案说明最高分值correctness of response Option 2 24 企业网络如何设计才能优化带宽？安装具备故障切换功能的设备限制故障域的大小部署折叠核心模型组织网络以控制流量模式答案说明最高分值correctness of response Option 4 25 当设计交换网络包含冗余链路时，需要哪种技术？链路聚合生成树协议虚拟专用网络虚拟 LAN答案说明最高分值correctness of response Option 2 26 网络管理员正在规划交换网络中的冗余设备和布线来支持高可用性。

实施生成树协议对此设计有什么好处？多个物理接口可以合并到一个 EtherChannel 接口。

冗余路径可用，且不会引起第 2 层逻辑环路。

网络访问可以进行扩展，以支持有线和无线设备。

高级路由协议可以实现快速融合。

答案说明最高分值correctness of response Option 2 27 通过无线介质扩展接入层的用户访问有哪两个好处？（请选择两项。

）提高灵活性减少关键故障点次数降低成本提高带宽可用性增强网络管理选项答案说明最高分值correctness of response Option 1 and Option 3 are correct. 28 作为一名网络管理员，您需要在公司网络上实施 EtherChannel。

思科CCNA考试答案(全)

CCNA思科考试答案（全）第 1 章考试1一家拥有10 名员工的小型公司使用单个LAN 在计算机之间共享信息。

哪种类型连接适合此公司？由当地电话服务提供商提供的拨号连接能够使公司方便且安全地连接员工的虚拟专用网络通过当地服务提供商建立的私有专用线路通过当地服务提供商提供的宽带服务（如DSL）答案：4解析：对于这种小型办公室，比较适合通过被称为数字用户线路(DSL) 的常见宽带服务实现Internet 连接，这种服务由当地的电话服务提供商提供。

由于员工人数很少，带宽的问题并不突出。

如果公司较大，在远程站点有分支机构，则专用线路会更加适合。

如果公司员工需要通过Internet 与公司联系，则采用虚拟专用网。

2哪种网络情况需要使用WAN？员工工作站需要获取动态分配的IP 地址。

员工在出差时需要通过VPN 连接到公司电子邮件服务器。

分支机构的员工需要与同一园区网络上的另一座建筑物内的公司总部共享文件。

员工需要访问托管在其建筑物内DMZ 中的公司Web 服务器上的网页。

答案：2解析：当出差的员工需要通过WAN 连接到公司电子邮件服务器时，VPN 将通过WAN 连接在员工笔记本电脑与公司网络之间创建一个安全隧道。

通过DHCP 获取动态IP 地址是LAN 通信的功能。

在企业园区的不同建筑物之间共享文件可通过LAN 基础设施来实现。

DMZ 是企业LAN 基础设施内一个受保护的网络。

3以下哪项描述了WAN 的特征？WAN 和LAN 在同一地理范围内运行，但有串行链路。

WAN 网络归运营商所有。

所有串行链路均被视为WAN 连接。

WAN 可提供到园区主干网的终端用户网络连接。

答案：2解析：WAN 可用于将企业LAN 互连到远程分支机构站点LAN 和远程工作人员站点。

WAN 归运营商所有。

虽然WAN 连接一般通过串行接口实现，但并不是所有串行链路均连接至WAN。

LAN（而非WAN）可在组织中提供终端用户网络连接。

4电路交换WAN 技术的两个常见类型是什么？（请选择两项。

思科ITE章考试原题及答案图文稿

思科I T E章考试原题及答案集团文件版本号：（M928-T898-M248-WU2669-I2896-DQ586-M1988）清洁计算机内部可以减少以下哪种负面环境因素？灰尘在清洁计算机机箱内部时，直接喷射压缩空气容易损坏下列哪种组件？风扇在生产车间，一个家具工厂用笔记本电脑来实现进程监控和报告。

生产车间的环境温度大约为 27 摄氏度（80 华氏度）。

湿度相当高，大约为70%。

风扇安装在通风口顶部。

这里的木屑灰尘非常多。

以下哪个条件最可能对在这一环境中使用的笔记本电脑产生不利影响？灰尘蔬菜罐头工厂使用笔记本电脑来监控生产线。

生产环境的环境温度大约是 24 摄氏度（75 华氏度）。

湿度约为 30%。

由于装罐设备的使用，因此噪音很高。

笔记本电脑放在一个木箱中，木箱三面距离笔记本电脑较近。

以下哪个因素最可能对在这一环境中使用的笔记本电脑产生不利影响？放置笔记本电脑的木箱科考队正在用笔记本电脑工作。

科学家们工作地点的温度范围为 -13 华氏度（-25 摄氏度）到 80 华氏度（27 摄氏度）。

湿度约为 40%。

噪声水平较低，但地形崎岖，风速可达每小时 45 英里（每小时 72 公里）。

在需要时，科学家们会停下脚步，用笔记本电脑输入数据。

下列哪一项条件最有可能对于在此环境下使用的笔记本电脑造成负面影响？温度以下哪一项是制定预防性维护计划的一部分？记录每项维护任务的详细信息和频率技术人员正在施工现场执行 PC 硬件维护。

作为预防性维护计划的一部分，技术人员应该执行什么任务？进气风扇除尘。

以下哪项任务应作为硬件维护例行程序的一部分？检查并固定任何松动的电缆。

在测试导致某个问题的若干可能原因时，应该首先测试哪类原因？最容易最明显的原因在解决计算机问题时可以使用下列哪两项物品来帮助制定行动计划（选择两项。

）计算机手册计算机维修历史记录日志为客户排除计算机故障之前应该备份哪两类数据（选择两项。

）Internet Explorer 收藏夹文件客户创建的文档一位客户反映最近有几个文件无法访问。

第一章思科高级网络互联(英文版答案)

1.What are two expected features of modern enterprise networks? (Choose two.)o support for limited growtho support for critical applicationso support for distributed administrative controlo support for 90 percent reliabilityo support for converged network trafficExplanation:All modern enterprise networks are expected to support critical applications, converged network traffic, diverse business needs, and provide centralized administrative control. Users expect enterprise networks to be up 99.999 percent of the time (not 90 percent.). Support for limited growth is not a usual network design criterion.2.What network design would contain the scope of disruptions on a networkshould a failure occur?o the installation of only enterprise class equipment throughout thenetworko the configuration of all access layer devices to share a single gatewayo the reduction in the number of redundant devices and connections in thenetwork coreo the deployment of distribution layer switches in pairs and the division ofaccess layer switch connections between themExplanation:One way to contain the impact of a failure on the network is to implement redundancy. One way this is accomplished is by deploying redundant distribution layer switches and dividing the access layer switch connections between the redundant distribution layer switches. This creates what is called a switch block. Failures in a switch block are contained to that block and do not bring down the whole network.3.Which action should be taken when planning for redundancy on a hierarchicalnetwork design?o immediately replace a non-functioning module, service or device on anetworko continually purchase backup equipment for the networko implement STP portfast between the switches on the networko add alternate physical paths for data to traverse the networkExplanation:One method of implementing redundancy is path redundancy, installing alternate physical paths for data to traverse the network. Redundant links in a switched network supports high availability and can be used for load balancing, reducing congestion on the network.4.Refer to the exhibit. Which devices exist in the failure domain when switch S3loses power?CCNA2 v6.0 Chapter 1 Exam 002o S4 and PC_2o PC_3 and AP_2o AP_2 and AP_1o PC_3 and PC_2o S1 and S4Explanation:A failure domain is the area of a network that is impacted when a critical device such as switch S3has a failure or experiences problems.5.Which design feature will limit the size of a failure domain in an enterprisenetwork?o the use of a collapsed core designo the use of the building switch block approacho the installation of redundant power supplieso the purchase of enterprise equipment that is designed for large trafficvolumeExplanation:In order to best limit the of a failure domain, routers or multilayer switches can be deployed in pairs.The failure of a single device should not cause the network to go down. Installing redundant power supplies may protect a single device from a power failure, but if that device suffers from another type of problem, a redundant device would have been a better solution. Purchasing enterprise equipment that handles large flows of traffic will not provide extra reliability in times of an outage. If acollapsed core design is used, the core and distribution are collapsed into a single device, increasing the chance of a devastating outage.6. A network administrator is planning redundant devices and cabling in aswitched network to support high availability. Which benefit will implementingthe Spanning Tree Protocol provide to this design?o Multiple physical interfaces can be combined into a single EtherChannelinterface.o Redundant paths can be available without causing logical Layer 2 loops.o Network access can be expanded to support both wired and wirelessdevices.o Faster convergence is available for advanced routing protocols.Explanation:With the implementation of redundant devices and links, redundant paths will exist in the network.This may cause a Layer 2 loop, and Spanning Tree Protocol (STP) is used to eliminate switching loops while maintaining reliability. STP is not required to combine multiple physical interfaces into a single EtherChannel interface. STP does not provide faster convergence or an expanded network that uses wired or wireless connectivity.7.What are two benefits of extending access layer connectivity to users through awireless medium? (Choose two.)o increased flexibilityo decreased number of critical points of failureo reduced costso increased bandwidth availabilityo increased network management optionsExplanation:Wireless connectivity at the access layer provides increased flexibility, reduced costs, and the ability to grow and adapt to changing business requirements. Utilizing wireless routers and access points can provide an increase in the number of central points of failure. Wireless routers and access points will not provide an increase in bandwidth availability.8.Which two features of enterprise class equipment assists an enterprise networkin maintaining 99.999 percent up-time? (Choose two.)o failover capabilitieso collapsed coreo redundant power supplieso failure domainso services moduleExplanation:Enterprise class equipment is designed with features such as redundant power supplies and failover capabilities. A failure domain is an area of a network that is impacted when a critical device fails. A collapsed core is a two-tier hierarchical design where the core and distribution layers are collapsed into a single layer. This reduces cost and complexity but does not provide redundancy and uptime.9.What capability is provided by the use of application-specific integrated circuitsin Cisco multilayer switches?o aggregating physical ports into a single logical interfaceo protecting data traffic in the event of a failed circuito forwarding of IP packets independent of the CPUo providing user authentication and authorizationExplanation:Application-specific integrated circuits (ASICs) increase the forwarding speed of a switch byallowing packets to bypass the CPU for processing.10.Which statement describes a characteristic of Cisco Meraki switches?o They promote infrastructure scalability, operational continuity, andtransport flexibility.o They are cloud-managed access switches that enable virtual stacking ofswitches.o They are campus LAN switches that perform the same functions asCisco 2960 switches.o They are service provider switches that aggregate traffic at the edge ofthe network.Explanation:The Cisco Meraki cloud-managed access switches enable virtual stacking of switches. They monitor and configure thousands of switch ports over the web, without the intervention of onsite IT staff. 11.In which situation would a network administrator install a Cisco Nexus Series orCisco Catalyst 6500 Series switch to promote infrastructure scalability?o to enable virtual stacking of switches to provide cloud-managed accesso on a service provider network to promote integrated security, andsimplified managemento on a data center network to provide expansion and transport flexibilityo on a campus LAN network as access layer switchesExplanation:Cisco Nexus Series switches are employed on data centers to promote infrastructure scalability, operational continuity, and transport flexibility. They also provide secure multitenant services by adding virtualization intelligence technology to the data center network.12.Which statement describes a characteristic of Cisco Catalyst 2960 switches?o They do not support an active switched virtual interface (SVI) with IOSversions prior to 15.x.o They are best used as distribution layer switches.o They are modular switches.o New Cisco Catalyst 2960-C switches support PoE pass-through.Explanation:Cisco Catalyst 2960 switches support one active switched virtual interface (SVI) with IOS versionsprior to 15.x. They are commonly used as access layer switches and they are fixed configuration switches.13.What are three access layer switch features that are considered when designinga network? (Choose three.)o broadcast traffic containmento failover capabilityo forwarding rateo port densityo Power over Etherneto speed of convergenceExplanation:The port density of a switch (the number of ports available on a single switch), forwarding rate (how much data the switch can process per second), and Power over Ethernet (the ability of the switch to deliver power to a device over the existing Ethernet cabling) are access layer switch features to be considered when designing a network. Failover capability, speed of convergence, and broadcast traffic containment are distribution layer features.14.What are two functions of a router? (Choose two.)o It connects multiple IP networks.o It controls the flow of data via the use of Layer 2 addresses.o It determines the best path to send packets.o It manages the VLAN database.o It increases the size of the broadcast domain.Explanation:Routers connect multiple networks in an organization to provide interconnections among them. They perform the task by using the network portion of the destination IP address to determine the best path to send packets to their destination.15.A network engineer is reviewing a network design that uses a fixed configurationenterprise router that supports both LAN and WAN connections. However, theengineer realizes that the router does not have enough interfaces to supportgrowth and network expansion. Which type of device should be used as areplacement?o a Layer 3 switcho a modular routero a PoE deviceo another fixed configuration routerExplanation:Modular routers provide multiple slots that allow a network designer to change or increase theinterfaces that exist on the router. A Layer 3 switch may increase the number of ports available on a router, but will not provide WAN connectivity. The PoE capability of a device is not related to the number of ports it has. Using another fixed configuration router will not provide the flexibility to adapt to future growth that using a modular router will provide.16.When a Cisco IOS device is being selected or upgraded, which option indicatesthe capabilities of the Cisco IOS device?o version numbero feature seto release numbero platformExplanation:The version number and release number refer to the overall device operating system. The platform refers to the specific model of a device. The feature set determines what a particular device is capable of.17.Immediately after a router completes its boot sequence, the networkadministrator wants to check the routers configuration. From privileged EXECmode, which of the following commands can the administrator use for thispurpose? (Choose two.)o show flasho show NVRAMo show startup-configo show running-configo show versionExplanation:The show startup-config command can be used to display the Cisco device configuration stored in NVRAM. The show running-config command can be used to display the currently activeconfiguration that is stored in RAM. The show flash command displays the files (not file content) stored in the flash memory.18.Refer to the exhibit. Which command was issued on a Cisco switch that resultedin the exhibited output?CCNA2 v6.0 Chapter 1 Exam 001o show vlan briefo show port-security addresso show mac-address-tableo show vlan summaryExplanation:The show port-security address command displays all secure MAC addresses configured on all switch interfaces. The show mac-address-table command displays all MAC addresses that the switch has learned, how those addresses were learned (dynamic/static), the port number, and the VLAN assigned to the port. The show vlan brief command displays the available VLANs and the ports assigned to each VLAN. The show vlan summary command displays the count of allconfigured VLANs.19.What is a characteristic of in-band device management?o It uses a terminal emulation client.o It is used for initial configuration or when a network connection isunavailable.o It uses a direct connection to a console or AUX port.o It is used to monitor and make configuration changes to a networkdevice over a network connection.Explanation:In-band device management is used to monitor and make configuration changes to a network device over a network connection. Configuration using in-band management requires at least one network interface on the device to be connected and to be operational, and it requires the use of Telnet, SSH, or HTTP to access the device.20.Which two requirements must always be met to use in-band management toconfigure a network device? (Choose two.)o a direct connection to the console porto a direct connection to the auxiliary porto a terminal emulation cliento at least one network interface that is connected and operationalo Telnet, SSH, or HTTP access to the deviceExplanation:Direct connections to the console and auxiliary ports allow for out-of-band management. Terminal emulation software is not always required because in-band management can be performed using a browser.21.Which type of information is displayed by the show ip protocols command thatis issued from a router command prompt?o the configured routing protocols and the networks that the router isadvertisingo interfaces with line (protocol) status and I/O statisticso interface information, including whether an ACL is enabled on theinterfaceo the routed protocol that is enabled and the protocol status of interfaces Explanation:The show ip protocols command displays information about the routing protocols that areconfigured, the networks the router is advertising, and the default administrative distance. The show interfaces command displays interfaces with line (protocol) status, bandwidth, delay, reliability, encapsulation, duplex, and I/O statistics. The show ip interfaces command displays interfaceinformation, including protocol status, the IP address, whether a helper address is configured, and whether an ACL is enabled on the interface. The show protocols command displays information about the routed protocol that is enabled and the protocol status of interfaces.22.A network technician needs to connect a PC to a Cisco network device for initialconfiguration. What is required to perform this device configuration?o Telnet accesso at least one operational network interface on the Cisco deviceo HTTP accesso terminal emulation client。

思科答案

ESwitching F.一台新交换机将加入远程办公室的现有网络。

网络管理员希望远程办公室的技术人员无法将新VLAN 添加到该交换机，但又希望交换机接收来自VTP 域的VLAN 更新。

要满足这些条件，必须在新交换机上执行哪两个VTP 配置步骤？（选择两项。

）1.在新交换机上配置IP 地址。

2.在新交换机上配置现有VTP 域名。

3.将两台交换机的所有端口都配置为接入模式。

4.将新交换机配置为VTP 客户端。

5.启用VTP 修剪。

2.下列关于无线基础架构组件的说法中哪两项正确？（选择两项。

）1.AP 将TCP/IP 数据包从802.11 帧封装格式转换为802.3 以太网帧格式（有线以太网络中）。

2.无线AP 不需要任何物理连接即可让无线客户端接入Internet。

3.AP 与交换机类似，是第2 层设备，为相连的每台无线主机提供专用带宽。

4.无线网卡和AP 之间不会发生冲突。

5.无线路由器兼具AP 和路由器的作用。

3.将Linksys 集成路由器上的安全模式设置为WEP 有什么作用？1.WEP 可标识无线LAN。

2.WEP 允许该接入点通知客户端它的存在。

3.WEP 将IP 地址转换为容易记忆的域名。

4.WEP 可加密无线客户端与接入点之间的数据。

5.WEP 可确保只有授权用户可以访问该WLAN。

6.WEP 将一个或一组内部地址转换为外部公有地址。

4.将路由器配置为SSH 服务器时，发出crypto key generate rsa 命令之前应先配置什么？1安全的域名2.VTP 域名3.IP 域名4.主机名5.VLAN 中继有何用途？1.通过减少广播流量提高网络性能。

2.选择在交换网络中传输数据的最佳路径。

3.通过一条链路传送多个VLAN 的流量。

4.避免交换网络中出现生成树环路。

2下列哪种说法正确描述了生成树路径开销？根据环路中连接的交换机总数计算。

根据给定路径上所有交换机的使用率计算。

根据给定路径上交换机的网桥优先级计算。

思科_第二学期_答案_1-4章

1请参见图示。

下列哪组设备仅包含中间设备？A、B、D、GA、B、E、FC、D、G、IG、H、I、J2您所在的网际网络发生了路由问题。

要鉴别此错误，应该检查以下哪种类型的设备？接入点主机集线器路由器交换机3请参见图示。

技术人员正在处理网络问题，需要验证路由器的LAN 接口。

要确认路由器接口工作正常，应该从此主机ping 哪个地址？127.0.0.1192.168.64.196192.168.254.1192.168.254.9192.168.254.2544下列哪三项陈述说明了传输层协议的特征？（选择三项）应用层协议使用TCP 端口号和UDP 端口号。

TCP 使用端口号提供可靠的IP 数据包传输。

UDP 使用窗口和确认获得可靠的数据传输。

TCP 使用窗口和定序提供可靠的数据传输。

TCP 是面向连接的协议。

UDP 是无连接协议。

5OSI 模型的哪两项功能在第2 层实现？（选择两项）物理编址编码路由布线介质访问控制6由于发生安全规规事件，必须更改路由器口令。

从以下配置项可获知什么信息？（选择两项。

）Router(config)#line vty 0 3Router(config-line)# password c13c0Router(config-line)#login这些配置项对远程访问指定了三条Telnet 线路。

这些配置项对远程访问指定了四条Telnet 线路。

这些配置项将控制台口令和Telnet 口令设置为"c13c0"。

因为Telnet 配置不完整，所以Telnet 访问将遭到拒绝。

允许使用"c13c0" 作为口令访问Telnet。

7请参见图示。

电缆1 和电缆2 的两端分别按照特定的物理层要求接线。

表中按编号列出了每个网段以及网络技术人员在该网段不同网络组件之间已经安装的电缆。

根据给定的数据回答，哪些网段的电缆安装正确？（选择三项）网段1网段2网段3网段4网段58下列哪种提示符代表适合copy running-config startup-config命令使用的模式？Switch-6J>Switch-6J#Switch-6J(config)#Switch-6J(config-if)#Switch-6J(config-line)#9请参见图示。

版本ccna考试第一章期末考试答案b

PDU 封装的正确顺序是什么答案说明最高分值2correctness of response 2 points for Option 10 points for any other option此试题参考以下领域的内容：Introduction to Networks数据封装建立融合网络有何用途为所有终端设备提供高速连接确保平等对待所有类型的数据包实现数据网络基础架构设备的容错能力和高可用性降低部署和维护通信基础设施的成本随着技术的发展，各个公司现在可以将不同的网络整合到一个平台之上，称为融合网络。

在融合网络中，语音、视频和数据通过同一网络传输，从而使人们不必再创建和维护各个单独的网络。

这也降低了提供和维护通信网络基础设施相关的成本。

答案说明最高分值correctness of response 2 points for Option 420 points for any other option此试题参考以下领域的内容：Introduction to Networks融合网络请参见图示。

哪个区域最有可能是图中所示的公司网络的外联网区域A区域B区域C区域D外联网是外部实体访问其他公司的数据的平台。

其形式可能是产品供应商所使用的库存服务器，也可能是外部实体用来访问当天客户数量的当前信息的Web 服务器。

Internet 用云和区域 A 表示。

内部网通常仅供内部人员使用。

区域 B 和 D 均是内部网的示例。

答案说明最高分值correctness of response 2 points for Option 320 points for any other option此试题参考以下领域的内容：Introduction to NetworksInternet主机正在访问远程网络的FTP 服务器。

中间网络设备在此对话中起到哪三个作用（请选择三项。

）重新生成数据信号充当客户端或服务器提供传输消息的通道应用安全设置来控制数据流出现错误时通知其他设备用作消息的源或目标中间设备负责管理数据传输，包括跟踪数据路径，出现故障时寻找备用路径并通知其他设备，以及应用安全和优先级策略。

(完整word版)网络思科1-6章考试题整合

第一章1.下列哪三个网络工具可以为家庭用户提供最低安全保护？（请选三项。

）BCFA.入侵防御系统B.反间谍软件C.防病毒软件D.访问控制列表E.电力线网络F.防火墙2.哪个表达准确定义了术语“拥塞”？DA.网络数据传送能力的一项衡量标准B.限制硬件或软件故障对网络的影响的一种方法C.管理网络资源使用率的一套技术D.网络资源需求超出可用容量的一种状态3.下列哪种说法正确描述了云计算的特征？DA.企业可以直接连接到 Internet，而不需要使用 ISPB.需要投资新的基础设施才能访问云。

C.设备能够通过现有电线连接到 Internet。

D.通过订阅可以使用 Internet 访问应用程序。

4.填空题缩写词（byod）是指最终用户使用个人设备访问公司网络和资源的趋势。

5.哪两个 Internet 解决方案可以为 LAN 上的计算机提供始终在线的高带宽连接？（请选择两项。

）BEA.卫星B.DSLC.移动电话D.电话拨号E.电缆6.要求使用复杂的强密码是为了实现下列哪个网络安全目标？BA.确保冗余B.确保数据保密性C.确保访问的可靠性D.维护通信完整性7.下列有关 LAN 和 WAN 两者关系的说法，哪两项是正确的？（请选择两项。

）ABA.与 LAN 连接内部终端设备相比，WAN 连接 LAN 的带宽速度较低。

B.WAN 通常通过多个 ISP 运营，而 LAN 通常由一个组织或个人运营C.WAN 必须是公共的，而 LAN 可以由公有或私有实体拥有。

N 和 WAN 均能连接终端设备。

E.Internet 属于 WAN。

8.选择网络介质时应遵循哪两个标准？（请选择两项。

）BEA.网络上使用的终端设备的成本B.介质可以成功传送信号的距离C.需要优先处理的数据类型D.安装在网络中的中间设备的数量E.要安装介质的环境9家庭用户必须要有哪种网络类型访问才能进行网上购物？DA.外联网B.内部网C.局域网D.Internet10电路交换网络有何特征？BA.如果电路发生故障，呼叫将转发到新的路径。

思科第二学期第一章答案

思科第二学期第一章答案本页仅作为文档封面，使用时可以删除This document is for reference only-rar21year.March考试系统跳至剩余时间 | 跳至导航 | 跳至考试试题参加考试- ERouting Chapter 1 - CCNA Exploration: 路由协议和概念 (版本剩余时间:01:59:59正在显示第 1 页，共 3 页下一页>页:1 跳转<上一页1 哪两项说法正确描述了路由器的组件（选择两项。

）RAM 永久存储着在启动过程中使用的配置文件。

ROM 含有硬件模块所执行的诊断程序。

NVRAM 存储着在启动过程中使用的 IOS的备份副本。

重新启动时闪存中的内容不会丢失。

ROM 包含最新而且最完整的 IOS 版本。

闪存包含用于标识 IOS 位置的启动系统命令。

2 网络管理员需要通过路由器的FastEthernet 端口直接连接两台路由器。

应使用哪种电缆直通电缆全反电缆交叉电缆串行电缆3 路由器从相连的以太网接口收到消息后，会更改哪项报头地址，再将消息从另一个接口发送出仅第 2 层源地址仅第 2 层目的地址仅第 3 层源地址仅第 3 层目的地址第 2 层源地址和目的地址第 3 层源地址和目的地址4 如果路由器在启动时无法找到有效的配置文件，将发生什么情况启动过程将重置。

路由器将提示用户进行响应，以进入设置模式。

启动过程将停止，直到获得有效的配置文件。

路由器将根据上次的有效配置生成默认配置文件。

路由器将监控本地流量，以确定路由协议配置要求。

5输入以下命令的作用是什么？R1(config)# line vty 0 4R1(config-line)# password check123R1(config-line)# login确保在进入用户执行模式之前输入口令设置通过 Telnet 连接该路由器时使用的口令要求在保存配置前输入 check123 创建本地用户帐户以便登录路由器或交换机6 在启动过程中，路由器可以从哪些位置加载 Cisco IOS （选择两项。

ccna1章节与期末答案

第一章：正确答案：2.4.5解析：由于不需要使用网络设备和专用服务器，对等网络易于创建，复杂性更低，且成本更少。

而且对等网络也没有集中管理。

这种网络安全性更低，不可扩展，而且那些同时充当客户端和服务器的设备可能性能更差正确答案：1解析：正确答案： 3.5解析：选择网络介质的条件包括：所选介质可以成功传送信号的距离、要安装所选介质的环境、必须传输的数据量和速度以及介质和安装的成本。

正确答案：3和4解析：终端设备上的应用程序可以生成数据，更改数据内容并且负责启动封装过程。

正确答案：1和4解析：终端设备会发出通过网络传输的数据。

中间设备会在链路发生故障时通过备用路径传输数据，并且会过滤数据传输以增强安全性。

网络介质提供网络消息的传输通道。

正确答案：4解析：外联网是公司外部的人或企业合作伙伴访问数据的网络区域。

内部网只描述通常仅供内部人员访问的网络区域。

当设备连接到有线网络时，有线LAN 会受BYOD（自带设备）影响。

使用大学无线LAN 的设备多为平板电脑和智能手机。

大学生主要使用无线WAN 来访问他们的手机运营商网络。

.正确答案：2解析：由于通过Internet 可以联系在线供应商，所以家庭用户通过Internet 进行网上购物。

内联网基本上是仅供内部使用的局域网。

外联网是外部合作伙伴访问组织内部特定资源的网络。

家庭用户并不一定使用LAN 来访问Internet。

例如，PC 可以通过调制解调器直接连接到ISP。

正确答案：1解析：内部网这个术语用于表示一个组织的私有局域网和广域网连接。

内部网的设计旨在仅允许该组织的成员、员工或其他获得授权的人员进行访问。

正确答案：2和4解析：电缆和DSL 均能实现高带宽、始终联网，并提供到主机计算机或LAN 的以太网连接。

10正确答案：2和3解析：移动电话连接需要使用移动电话网络。

卫星连接通常用于家庭或企业外部不便使用物理布线的位置。

11正确答案：2解析：当对网络资源的请求超出了可用容量时，网络就会变得拥堵。

2017CCNA第二学期第一章考试答案解析

以下是针对您未获得满分的试题给出的反馈。

某些交互式试题可能不显示您的答案。

分项分数：1 与固定配置的交换机相比，模块化交换机具有哪两个优点？（请选择两项。

）正确响应您的响应每台交换机的成本更低可扩展性更高转发率更低需要的电源插座数目更少带宽聚合可以使用多个端口固定配置交换机价格较低，但是它具有指定数量的端口且不能添加端口。

它们提供的高速端口通常比较少。

为了在包含固定配置交换机的网络上扩展交换，需要购买更多的交换机。

这增加了需要使用的电源插座数量。

模块化交换机只需要购买额外的线卡便可以扩展。

带宽聚合也更容易，因为机箱的背板可以为交换机端口线卡提供所需的带宽。

此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.2 交换网络2 思科无边界架构接入层的基本功能是什么？正确响应您的响应聚合第 2 层广播域聚合第 3 层路由边界为用户提供访问权提供高可用性思科无边界架构接入层的功能是为用户提供网络访问。

第 2 层广播域聚合、第 3 层路由边界聚合和高可用性是分布层的功能。

也有说答案是聚合第 3 层路由边界此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.1 融合网络3 思科无边界架构分布层的基本功能是什么？正您的充当主干聚合所有园区块聚合第 3 层路由边界为用户提供访问权思科无边界架构的分布层的一项基本功能是在不同的 VLAN 之间路由。

充当主干和聚合园区块是核心层的功能。

为用户提供访问是接入层的功能。

此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.1 融合网络4 若将大端口密度、容错和低价作为重要指标，应使用哪个交换机外形因素？正确响应您的响应固定配置交换机模块化交换机可配备机架的 1U 交换机可堆叠式交换机堆叠式交换机可以使用特殊电缆实现互联，从而在交换机之间提供高带宽的吞吐量，并像单个大型交换机一样运行。

思科章节练习第二章到第七章试题及答案

思科章节练习第二章到第七章试题及答案第二章1.下列哪些陈述正确指出了中间设备在网络中的作用？（选择三项） (135) 确定数据传输路径发起数据通信重新定时和重新传输数据信号发送数据流管理数据流数据流最后的终止点2.请选择关于网络协议的正确陈述。

（选择三项。

135）定义特定层 PDU 的结构规定实现协议层功能的方式概述层与层之间通信所需的功能限制了对硬件兼容性的需要需要取决于协议层的封装过程杜绝厂商之间的标准化3.封装的两个功能是什么？（45选择两项）跟踪终端设备之间的延迟为通信提供统一的网络路径在传输前可以修改原始数据标识属于同一通信的数据片段确保数据片段可以转发到正确的接收端设备4.数据链路层封装添加的报尾信息有何主要功能？1支持差错校验确保数据按照顺序到达确保送达正确目的标识本地网络中的设备帮助中间设备进行处理和路径选择5.OSI 模型哪两层的功能与 TCP/IP 模型的网络接入层相同？（选择两项34）网络层传输层物理层数据链路层会话层6.什么是 PDU？4传输期间的帧损坏在目的设备上重组的数据因通信丢失而重新传输的数据包特定层的封装7.以下哪种特征正确代表了网络中的终端设备？ 2管理数据流发送数据流重新定时和重新传输数据信号确定数据传输路径8.IP 地址为 10.0.0.34 的“手机A”已经与 IP 地址为 172.16.1.103 的“IP 电话1”建立了 IP 会话。

请根据图示回答，下列哪个设备类型是对无线设备“手机A”功能的最准确描述？ 2目的设备终端设备中间设备介质设备9.下列哪三个标签正确标识了图示网段的网络类型？（236选择三项）网络 A -- WAN网络 B -- WAN网络 C -- LAN网络 B -- MAN网络 C -- WAN网络 A -- LAN10.下列哪三项陈述是对局域网 (LAN) 最准确的描述？（选择三项125）LAN 通常位于一个地域内。

此类网络由由一个组织管理。

思科ITE章考试原题及答案图文稿

思科ITE章考试原题及答案图文稿思科I T E章考试原题及答案集团文件版本号：（M928-T898-M248-WU2669-I2896-DQ586-M1988）清洁计算机内部可以减少以下哪种负面环境因素？灰尘在清洁计算机机箱内部时，直接喷射压缩空气容易损坏下列哪种组件？风扇在生产车间，一个家具工厂用笔记本电脑来实现进程监控和报告。

生产车间的环境温度大约为27 摄氏度（80 华氏度）。

湿度相当高，大约为70%。

风扇安装在通风口顶部。

这里的木屑灰尘非常多。

以下哪个条件最可能对在这一环境中使用的笔记本电脑产生不利影响？灰尘蔬菜罐头工厂使用笔记本电脑来监控生产线。

生产环境的环境温度大约是 24 摄氏度（75 华氏度）。

湿度约为 30%。

由于装罐设备的使用，因此噪音很高。

笔记本电脑放在一个木箱中，木箱三面距离笔记本电脑较近。

以下哪个因素最可能对在这一环境中使用的笔记本电脑产生不利影响？放置笔记本电脑的木箱科考队正在用笔记本电脑工作。

科学家们工作地点的温度范围为 -13 华氏度（-25 摄氏度）到 80 华氏度（27 摄氏度）。

湿度约为 40%。

噪声水平较低，但地形崎岖，风速可达每小时 45 英里（每小时 72 公里）。

在需要时，科学家们会停下脚步，用笔记本电脑输入数据。

作为预防性维护计划的一部分，技术人员应该执行什么任务？进气风扇除尘。

以下哪项任务应作为硬件维护例行程序的一部分？检查并固定任何松动的电缆。

）计算机手册计算机维修历史记录日志为客户排除计算机故障之前应该备份哪两类数据（选择两项。

思科第二学期第一章答案

ccna第二学期第一章考试答案解析

思科第二学期期末试题及答案

CISCO第二学期期末考试答案

思科第二期考试试题及答案(正确率100%)

思科 cisco 课后习题答案

思科第2学期第1章答案

思科CCNA考试答案(全)

思科ITE章考试原题及答案图文稿

第一章思科 高级网络互联(英文版答案)

思科答案

思科_第二学期_答案_1-4章

版本ccna考试第一章期末考试答案b

(完整word版)网络思科1-6章考试题整合

思科第二学期第一章答案

ccna1章节与期末答案

2017CCNA第二学期第一章考试答案解析

思科章节练习第二章到第七章试题及答案

思科ITE章考试原题及答案图文稿

第一章思科高级网络互联(英文版答案)