思科第2学期第4章答案
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. 。
思科第二学期第四章练习
1当包含 VLAN 的交换网络中配置了 VTP 时，下列哪种说法正确？Option 4 VTP 仅与 802.1Q 标准兼容。
VTP 增大了管理交换网络的复杂性。
通过 VTP 可将交换机配置为多个 VTP 域的成员。
VTP 会向同一 VTP 域内的所有交换机动态通知 VLAN 更改情况。
2VTP 以客户端模式工作具有哪两项特点？（选择两项。
）Option 15无法添加 VLAN可添加在本地有效的 VLAN无论 VLAN 信息如何，将广播从所有端口转发出去只能传递 VLAN 管理信息而无法接受更改可向同一 VTP 域中的其它交换机转发 VLAN 信息3请参见图示。
交换机 S1 处于 VTP 服务器模式。
交换机 S2 和 S3 处于客户端模式。
管理员意外断开了 S2 的 F0/1 接口上的电缆。
这会对 S2 产生什么后果？Option3S2 会自动转换到 VTP 透明模式。
S2 会将所有 VLAN 从 VLAN 数据库中删除，直到重新接好电缆为止。
S2 会保存已知的最新修订版本的 VLAN ，但如果它重新加载，就会丢失这些VLAN。
当电缆重新接好时，S2 会自动向 172.17.99.11 发送一个 VTP 通告请求。
4下列关于实施 VTP 的说法中哪两项正确？（选择两项。
）Option12交换机必须通过中继链路来连接。
VTP 域名区分大小写。
透明模式下的交换机不能配置新 VLAN。
必须使用 VTP 口令且区分大小写。
使用 VTP 的交换机必须具有相同的交换机名称。
5请参见图示。
VTP 域内的所有交换机均是新的。
交换机 SW1 被配置为 VTP 服务器，交换机 SW2 和 SW4 被配置为 VTP 客户端，交换机 SW3 被配置为 VTP 透明模式。
哪台或哪些交换机会收到 VTP 更新并根据更新来同步 VLAN 配置？Option 4所有交换机均会收到更新并同步 VLAN 信息。
仅交换机 SW2 会收到更新并同步 VLAN 信息。
(完整版)思科ite6.0第四章考试答案
第四章考试答案1. 而消极的环境因素清理电脑内减少吗?•灰尘•EMI•生锈•防静电2. 哪个组件可以很容易地受到的直接喷射压缩空气清理电脑机箱内部的什么时候?•风扇•散热器•电力供应•CPU•电缆连接器3. 在生产地板,家具工厂笔记本电脑过程监测和报告。
生产楼环境是80华氏度(27摄氏度)左右。
湿度水平相当高70%左右。
空气循环风扇安装在天花板上。
木粉是普遍的。
这条件是最有可能影响在这种环境下使用的一台笔记本电脑吗?•温度•湿度•空气流•尘埃4. 蔬菜罐头工厂生产线使用笔记本电脑的监控。
生产环境有一个环境温度在华氏75度(摄氏24度)。
湿度水平约为30%。
噪音水平很高,由于灌装机械。
笔记本电脑是一个木制的盒子里,紧紧围绕着笔记本电脑三面。
哪个因素最可能影响在这种环境下使用的一台笔记本电脑吗?•房间的温度•湿度•噪音•笔记本电脑的容器5. 科学探险团队使用笔记本电脑。
科学家们正在研究的温度范围从-13华氏度(-25摄氏度)到80华氏度(27摄氏度)。
湿度水平约为40%。
噪音水平很低,但地形是粗糙和时速可以达到45英里(每小时72公里)。
在需要的时候,科学家们停止行走,使用笔记本电脑输入数据。
这条件是最有可能影响在这种环境下使用的一台笔记本电脑吗?•温度•湿度•粗糙的地形•风6. 创建一个预防性维护计划的一部分是什么?•记录每个维护任务的细节和频率•执行硬件升级•丢弃所有取代部分•执行一个法医审计的安全漏洞7. 电脑的技术员执行硬件维护在一个建筑工地。
什么任务应该技术员执行预防性维护计划的一部分?•把灰尘从摄入的粉丝。
•备份数据,格式化硬盘,重新安装数据。
•开发和安装法医跟踪软件。
•执行审计的所有软件安装。
8. 哪个任务应该是硬件维护程序的一部分吗?•审查安全更新。
•更新病毒定义文件。
•调整显示器的最佳分辨率。
•从硬盘中除尘。
•检查并确保任何松散的电缆。
9. 在测试的过程中几个可能的原因的理论问题,应该先测试吗?•最简单和最明显的•那些客户认为是最重要的•最复杂的,难以诊断•随机选择的选择10. 这两个项目可以用来帮助建立一个行动计划解决电脑问题?(选择两个。
思科 cisco 课后习题答案
附录
检查你的理解和较难的问题和 练习答案
第1章
检查你的理解
1．B、C、E 以太网交换机和转发器通常用于 LAN 中。路由器可视为 LAN 设备和 WAN 设备， 用于在公司网络内部路由分组、将分组路由到 ISP 以及在自主系统之间路由分组。接入服务器集中拨 入和拨出的用户通信，它可能有模拟和数字接口，可支持数百名用户同时连接到提供商的 WAN。 2．D 3． 电路交换：D 分组交换：C 面向连接的分组交换：B 无连接的分组交换：A 4． 城域以太网：A X.25：D ATM：B 帧中继：C 5．C DTE 通过 WAN 传输来自客户网络或主机计算机的数据。DTE 通过 DCE 连接到本地环路。 路由器是一种 DTE 设备，它使用 CSU/DSU（DCE 设备）连接到 WAN。 6．E 租用线是一种专用的点到点链路，通常是向运营商租用的。 7．DLCI 唯一地标识了帧中继虚电路，这确保 DTE 设备之间能够进行双向通信。 8．异步传输模式（ATM）技术可通过私有和公共网络传输语音、视频和数据，它是建立在基于 信元的架构而不是基于帧的架构的基础之上的。 9．C 10．B 11．C 12．E 13．C 14．C 15．C Cisco 企业分支机构架构让能够将园区网中的应用程序和服务延伸到各种远程位置和用户， 接入层用于将用户连接到网络，这层通常使用第 2 层和第 3 层交换机。 在北美，ISDN PRI 包含 23 个 64kbit/s 的 B 信道和 1 个 64kbit/s 的 D 信道，总比特率高 VPN 使用隧道通过公共网络（如 Internet）在两个私有网络之间安全地传输数据。 分布层将工作组放在不同的网段中，从而隔离子网或 VLAN 中的网络问题。VLAN 之间 本地环路将用户驻地的 CPE 连接到服务提供商的 CO，有时也被称为“最后一公里” 。 企业远程工作人员架构让雇员能够远程（通常是从家里）连接到网络。 而不管其规模和位置如何。 核心层也称为网络主干，设计用于尽可能快地交换分组。
大学英语2册4单元练习答案
2. How does the author work nowadays? {[She writes and edits articles online, submits them via email, and communicates with colleagues via the Internet, too.}]
10) When we say that we see light at the end of the tunnel, we mean that victory is {[in sight]}.
BOOK 2 - Unit 4 - Comprehension - Content Questions One of you asks the first six questions and the other answers. Starting from question 7, change roles. When you have finished, the teacher may want to put some of the questions to you to check your progress.
BOOK 2 - Unit 4 - Language Focus - Vocabulary 1. Fill in the gaps with words or phrases given below. Change the form where necessary. 1) He would have preferred his wife not to work, but {[conversely}] he was also proud of what she did.
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。
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客户工作站上的 IP 地址配置有误客户工作站上的 DNS 服务器配置有误客户工作站上的默认网关配置有误请参见图示。
对于图中所示的数据会话，下列哪两项描述正确（选择两项。
）数据会话由客户端所运行的 HTTP 应用程序进程启动。
/数据会话由客户端的 TCP 端口 80 标识。
用户通过发送电子邮件启动数据会话。
Internet 服务器的 IP 地址是。
Internet 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Anti-X 软件属于哪一类地址主机地址网络地址广播地址 /组播地址在图中所示的其中一台路由器上执行 show ip route 命令，显示下列输出：C is directly connected, Serial0/0R [120/1] via 00:00:19, Serial0/0R [120/2] via 00:00:20, Serial0/1R [120/2] via 00:00:20, Serial0/1C is directly connected, Serial0/1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 fa0/0PC3 可以成功 ping 通 RTB。
思科第2学期第4章答案
1下列哪两项是路由器的功能？（选择两项。
）连接多个 IP 网络。
通过使用第 2 层地址控制数据流。
确定发送数据包的最佳路径。
管理 VLAN 数据库。
扩大广播域。
答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.22为了将数据包发送到远程目的地，必须对主机上的哪三条信息进行配置？（请选择三项。
）hostnameIP 地址子网掩码默认网关DNS 服务器地址DHCP 服务器地址答案答案最高分值 correctness ofresponse Option 2, Option 3, and Option 4 are correct. required.33请参见图示。
如图所示，网络管理员已配置了 R1。
当管理员检查串行接口的状态时，接口显示闭。
要打开 R1 的串行接口，必须在其中额外输入什么命令？ipv6 enableclockrate 128000endno shutdown答案 答案 最高分值correctness of response Option 424哪一项功能可以将路由器与第 2 层交换机区别开来？路由器可以配置 IP 地址。
交换机不能。
交换机将数据包从一个物理接口转发到另一个物理接口。
路由器不是这样。
交换机使用信息表确定如何处理数据流量。
路由器不是这样。
路由器支持多种类型的接口。
交换机通常支持以太网接口。
答案 答案 最高分值correctness of response Option 425为了使路由器能够手动将指定的网络前缀与自动生成的接口标识符相组合在一起，可以使用哪由器接口上配置 IPv6 地址？ipv6 enableipv6 address ipv6-address/prefix-lengthipv6 address ipv6-address/prefix-length eui-64ipv6 address ipv6-address/prefix-length link-local答案 答案 最高分值correctness of response Option 326启用了 IPv6 接口要求的最低地址类型是什么?环回唯一本地本地链路静态全局单播答案 答案 最高分值correctness of response Option 327哪两条信息会显示在 show ip interface brief 命令的输出结果中？（请选择两项。
(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。
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客户工作站上的IP 地址配置有误客户工作站上的DNS 服务器配置有误客户工作站上的默认网关配置有误请参见图示。
对于图中所示的数据会话，下列哪两项描述正确？（选择两项。
）数据会话由客户端所运行的HTTP 应用程序进程启动。
/数据会话由客户端的TCP 端口80 标识。
用户通过发送电子邮件启动数据会话。
Internet 服务器的IP 地址是192.168.17.43。
Internet 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Anti-X 软件192.168.17.111/28 属于哪一类地址？主机地址网络地址广播地址 /组播地址在图中所示的其中一台路由器上执行 show ip route 命令，显示下列输出：C 192.168.4.0/24 is directly connected, Serial0/0R 192.168.5.0/24 [120/1] via 192.168.4.2, 00:00:19, Serial0/0R 192.168.1.0/24 [120/2] via 192.168.3.1, 00:00:20, Serial0/1 R 192.168.2.0/24 [120/2] via 192.168.3.1, 00:00:20, Serial0/1C 192.168.3.0/24 is directly connected, Serial0/1此命令是从哪一台路由器执行的？ABC /D请参见图示。
Step-By-Step-3000-第二册-Unit4-答案
Unit 4 Getting ready for the future careerPart I-A1. cook,Experience, work on weekends,Call 23597392. English and math teachersA bachelor’s degreeTeaching certificate3. Marking Communication SupervisorBusiness AdministrationPC and presentation354, 164934. Area Sales ManagerCareers and extensiveHardworking and initiated quick learnerChallengingMobile, travel extensivelyExpected salary, recent photo, 385, NY158355. BuyerA competitive salary and a benefits packageCareer developmentBusiness or engineering2-3 years’Good command of EnglishCommunication and interpersonalWork in teamsContact phone number and a copy of diploma to 962 West Avenue, Syracuse, NY 186406. AccountantAccounting or auditingStrong computer skills3 years’, trading companiesEducation certificate, ID card copy and photo to 404, South 7th Street, NYCTapescript:1.Cook need immediately in a busy downtown restaurant! You must be goodand dependable. Experience is preferred and work on weekend is required.If you are interested, please call 2359739.2. A small private school needs English and math teachers. Applicants musthave a bachelor’s degree and teaching certificate. Interested people please send your resume to Wales Charter School, 19 Snow Road, NYC.3.As the world leader in imaging business from photographic to commercialto electronic imaging, we invite application from qualified persons for the position of Marketing Communication Supervisor. Candidates must have bachelor’s degree in Business Administration and good PC and presentation skill. Please apply by sending your resume to MTP, P.O. Box 354, Syracuse, NY 16493.4.If you are a dynamic, hardworking and initiated quick learnerinterested in working in a challenging environment, if you are mobile and able to travel extensively, please join our Truck Tire and Passenger Car Tire Teams and be the Area Sales Manager. Professional careers and extensive training are provided to you. Are you the right one for us? Send your detailed resume with your expected salary and recent photo to: Martin’s Apparel, 385 Rockledge Street, Syracuse, NY15835.5.We are among the top 50 industrial companies worldwide with an annualturnover in excess of US$40 billion. We provide for our employees not only a competitive salary and a benefits package, but also excellent career development opportunities. We are now seeking qualified people to fill the position of Buyer. Candidates’ qualifications include:a bachelor’s degree in business or engineering, 2-3 years’relevantworking experience, good command of English, good communication and interpersonal skills and the ability to work in teams. Those who are interested please send your resume, a recent photo, contact phone number and a copy of your diploma to 962 West Avenue, Syracuse, NY18640 6.we, one of the world’s largest food manufacturers, have the positionof Accountant available. Applicants must have a university degree in accounting or auditing, strong computer skills and a minimum of 3 years’experience with trading companies. If you believe that you have the experience and talent to develop and grow with one of the world’s leading food companies, please send your resume, education certificate, ID card copy and photo to 404, South 7th Street, NYC.Part I – BWeb designer, the hottest jobs, six1. Tissue engineersSkin, on the market, growing organs in test tubes2. Genetic programmersDefects, smart, certain cancers3. farmersCrops and livestock, proteins, vaccine-carrying , cows, sheep and goats.4. food monitorsfast-growing fish and freeze-resistant fruits5. Hot-line handymanReprogramming, power up, giving abuse, home electronics, video phone 6. Narrow castersPersonalized, media and advertisers, tastes and smells.Part I – CAndrew Sue934kgLansing, Michiganthe National Bicycle Leaguethe American Bicycle Association’sBMXWorld125donating, Special OlympicsTape script…tell you about a 9-year-old boy. He is a bicycle motocross racer, and his name is Andrew Sue. He rides under Number One on the track, and he lives in Lansing, Michigan. He’s also Number One in other ways. He weighs about 34 kilograms. The boy is a two-time BMX, that’s Bicycle Motor Cross, national champion, and he’s also a two-time world champion. He’s right Number One for his age in the National Bicycle League and Number One in the American Bicycle Association’s Michigan II District. And he’s been a bicycle motocross racer since he was five years old. Andrew has collected more than 126 trophies for his feats on the track. His awesome display of hardware has not set around collecting dust, however. He donated many of the trophies, the hardware, to the Michigan Special Olympics. I don’t know if you are familiar with that. Now Special Olympics on television and he decided that he had so many trophies that he ought to give them some. And he talked it over with his parents that he ought to give them some. And he talked it over with his parents and they too thought it was a good idea. His father Tom Sue says that they were sort of running out of room in the house. After seeing the crippled children on television, they knew they had found a worthwhile purpose for the trophies. And Andrew’s unselfish gesture has brought praise from Michigan State Representative and Speaker of the House, Bobby Crimm. He wrote a letter and said, “ Your Mom and Dad must be very proud of you, Andy. You are truly an extraordinary young man.” And Andrew’s parents are obviously quite proud of what their son has done both on the track as a bicycle motocross Number One winner and also by giving the trophies to handicaps, participants in the Special Olympics. He knows that those trophies will bring other people great joy too.Part II- Bb, a, b, aPart II- CF T F F F T FPart II- D1.hiring painters2.doing advertising3.providing equipment4.taking care of payroll5.writing contract6.doing final inspection with customerTape scriptNineteen-year old Mark Laratonda is a local college student. He is getting useful business experience this summer at home in Pennsylvania. Mark and other students are spending their summer working for a company called Student Painters. Student Painters is based in Toronto. It operates in 28 states in the United States and in 5 Canadian provinces.All of the mangers and painters at Student Painters are full-time college students. They are earning money for tuition and expenses for the next school year.Student Painters was founded in 1980. Its goal is give students a chance to experience the real business world. I aratonda is a manager for Student Painters. He is also a business marketing major at Indiana University. He says, "Working at Student Painters is a great experience for me. I am learning a lot about how business operate."Laratonda heard about Student Painters last year at his university. "I filled out an application and they called me for an interview. After the interview, they called me again and offered me a job", Laratonda said. He eagerly accepted the opportunity. He said, "It's a great chance to get experience in the business world. I get to work in many different places and I get to work outside. There a lot of responsibilities. But there are a lot of rewards. It looks good on your resume, too."In order to become a manager, Laratonda was trained by company instructors. As a manager, he must do many things. For example, he is responsible for hiring the painters. He also does the advertising. Mar must provide equipment such as ladders, paint, and brushes for the painters. He takes care of the payroll ad writes the contracts. It is also his responsibility to do the final inspection of each project with the customer.Laratonda supervises two groups of painters. Each group has three painters. The painters usually work eight hours a day. "The people I hired are very responsible. They work hard and get the job done. " Laratonda says.His painters have completed 15 projects since May. They have about $40,000 worth of painting jobs to do this this summer.Statements:1.Student Painters is based in New York.2.Student Painters was founded in 1980.3.Student Painters operates in 50 states in the United States and in 5 Canadian provinces.4.Mark Laratonda supervises three groups of painters.ratonda's painters have completed 15 jobs since July.pany instructors trained Laratonda to become a manager.7.Mark Laratonda is an engineering major at Indian University.Part III-AQuestion 1: 15 to 20 yearsQuestion 2: my abilities and aptitudes, as well as my interests and aims Question 3: find success and satisfactionQuestion 4: the immediate advantages, the long-term prospectsQuestion 5: my guidance counsellor, my parents, my teachers and my headmaster.Question 6: Have I made a real study of jobs?Question 7: regard, a means of getting money, my future happiness and contentment, combination.Part III-B1.Affect/ future course of life/ determine/ friends/ husband or wife/ where you live/ recreational activities/ other aspects2.Weak points/ strong ones/ what kind/ you want to be3.What/ other people / important and challenging/ talk to people/ watch/ at work4.Satisfaction/ not just start/ years to come/ importance of education / promotion/ preference/ educated persons5.Experience/ benefit/ help/ think about/ stimulate/ really want to do / offer suggestions/ take advantage of/ qualities and qualifications6.Read about/study/ over and over again7.---------------------Tape scriptIn order to give you as much help as possible. I have drawn up a lit of questions that you ought to ask yourself."Have I given thought to what I would like to be doing 15 to 20 years from now?" Bear in mind that the career you choose will affect the future course of your life. It will partially determine your range of friends, your choice of husband or wife, where you live, your recreational activities, and other important aspects of your life."Have I a clear knowledge of my abilities and aptitudes, as well as my interests and aims?" Be honest about your weak points as well as your strong ones. Take a really good look at yourself and give real thought to the kind of person you are, what you are good at , and what kind of person you want to be."Do I know the kind of occupations in which people like myself tend to find success and satisfaction?" Once you have examined and found out about yourself, your next question is what you really do with yourself. You can gain some idea of what other people, with similar abilities and interests, consider to be important and challenging in the careers that they choose, by talking to people already in the careers that interest you. Watch these people at work."Have I weighted carefully the immediate advantages against the long-term prospects offered by the jobs I am considering?" Will the occupation you select give you satisfaction, not just when you start, but in the years to come? Realize now the importance of education in all fields, technical and professional. Remember that when promotion occurs, preference is usually given to educated persons--other things being equal."Have I talked about my job preferences with my guidance counsellor, my parents, my teachers and my headmaster?" Remember they have tremendous fund of experience from which you should benefit. They can help you think about the jobs in which you will find satisfaction and challenge. They can stimulate you to give careful thought to what you really what to do, and offer useful suggestions as to how you might take full advantage of your personal qualities and qualifications."Have I made a real study of jobs? It takes a very long time to find the work that suits you the best. Reading about and studying a number of occupations is something you should do over and over again."How do I regard my job? Is it just a means of getting money to do the things that I want to do ? Is the work important to me and my futurehappiness and contentment? Is it a combination of both these things?"The above questions and their answers should give you some better ideas about how you should start planning your career. Your life-long job can not be approached in any kind of haphazard fashion. It must be considered carefully, examined from every angel, talked over with those who know you and those who can help you in any way.Part IVFilling up formsGeneral views:A.Personal life, habits, little or nothing, the matter in handB.Hesitate, intimate friends, goes blankC.The worstD.No reliefSupporting detailsA.Driving license/ evening course/ holiday abroadApplying for job/ stamps/ measles/ father tobacconist/ in Foreland/ died at 82B. Date of birth/ nationality/ serious illness/ tonsils/ delicate/ lazy/ personal defects/ contact lenses/ upper teeth not own/ character/ gambling/ difficult to get upC. Education/ previous experience/ posts held/ dates/ struggle to remember/ exams/ how long/ what firms/ if blank/ in prison/ dubious occupationD. Summons/ explain discrepanciesTape script:Of all things in th world, I most dislike filing up forms. In fact, I have a positive horror of it. Applying for a driving license, registering for an evening course, booking a holiday abroad- everything nowadays seems to involve giving information about one's personal life and habits that has little or nothing to do with the matter in hand. When applying for a job, it may be of some obscure interest to a prospective employer to learn that I collect stamps or bad measles as child. But why should he conceivably want to know that my father was a tobacconist to live in Foreland and died when he was 82. The authorities who require one to fill up forms frequently demand answers to questions that one would hesitate to put to one's intimate friends. The worst of it is that, when confronted with such questions, my mind goes blank and I can hardly remember my own date of birth, let alone my nationality. Have I ever suffered from a serious illness? Have I ? What do they mean by "serious"? I had my tonsils out in hospital when I was eight, and my mother always assured me I wasdelicate, but father contended I was born lazy. Do I suffer from my personal defects? Well, I wear contact lenses and my upper teeth are not my own. But perhaps the word "defect" applies to my character. Am I supposed to admit that I like gambling and find it difficult to get up in the morning, both of which are true? Of all, I think job applications are the worst- education, pervious experience, posts held, give dates. Terrified by the awful warning about giving false declarations, which appears at the bottom of the form, I struggle to remember what exams I passed and how long I worked for what firms. However hard I try, there always seems to be a year or tow for which I can not satisfactorily account and which, I am certain, if left blank, will give the impression that I was i prison or engaged in some occupations too dubious to mention. Even when the form is safely posted, there is no relief as I hourly await the summons from some furious official to explain the discrepancies on my form.（注：可编辑下载，若有不当之处，请指正，谢谢!）。
思科 第二学期 答案 1-4章
第一章路由和数据包转发介绍1．哪两项说法正确描述了路由器的组件？（选择两项）（B、D）A．RAM 永久存储着在启动过程中使用的配置文件B．ROM 含有硬件模块所执行的诊断程序C．NVRAM 存储着在启动过程中使用的IOS 的备份副本D．重新启动时闪存中的内容不会丢失E．ROM 包含最新而且最完整的IOS 版本F．闪存包含用于标识IOS 位置的启动系统命令2．图中的哪些接口可用于租用线路WAN 连接？（选择两项）（A、D）A．1B．2C．3D．4E．5F．63．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？（B）A．启动过程将重置B．路由器将提示用户进行响应，以进入设置模式C．启动过程将停止，直到获得有效的配置文件D．路由器将根据上次的有效配置生成默认配置文件E．路由器将监控本地流量，以确定路由协议配置要求4．以下哪一项正确描述了路由器启动时的顺序？（A）A．加载bootstrap、加载IOS、应用配置B．加载bootstrap、应用配置、加载IOSC．加载IOS、加载bootstrap、应用配置、检查硬件D．检查硬件、应用配置、加载bootstrap、加载IOS5．加载配置文件时的默认顺序是怎样的？（C）A．NVRAM、FLASH、ROM B．FLASH、TFTP、CONSOLE C．NVRAM、TFTP、CONSOLE D．FLASH、TFTP、ROM 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）（B、E）A．RAM B．TFTP 服务器C．NVRAM D．设置例程E．闪存F．终端7．下列哪些是路由器的功能？（选择三项）（A、C、D）A．分组交换B．网段扩展C．广播域分段D．根据逻辑编址选择最佳路径E．根据物理编址选择最佳路径8．当路由器收到从一个网络发往另一个网络的数据包时，它会执行哪三个过程？（选择三项）（A、D、E）A．通过解开第2 层帧报头来解封第3 层数据包B．通过IP 报头中的目的MAC 地址在路由表中查找下一跳地址C．解封第3 层数据包时将第2 层帧报头保持原样D．通过IP 报头中的目的IP 地址在路由表中查找下一跳地址E．将第3 层数据包封装成新的第2 层帧，并将该帧从送出接口转发出去F．将第3 层数据包封装成特殊的第1 层帧，并将该帧转发到送出接口9．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。
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。
思科答案CCNA4-4
1.下列关于网络安全的说法中哪两项正确？（选择两项。
）25保护网络免受内部威胁侵害具有较低的优先级，因为由公司员工带来的安全风险较低。
无论是能自己编写攻击代码的资深黑客，还是从Internet 下载攻击程序的入门攻击者都可能对网络安全造成严重威胁。
假设一家公司将其web 服务器部署在防火墙之外，并充分备份web 服务器，则无需采取其它安全措施来保护web 服务器，因为即使它被攻击了也不会造成损失。
公众认可的网络操作系统（例如UNIX）和网络协议（例如TCP/IP）可采用默认设置工作，因为它们没有内在的安全缺陷。
保护网络设备免受水电等外在因素造成的物理破坏是安全策略的必要组成部分。
2.下列关于网络攻击的陈述，哪两项是正确的？（选择两项。
）45强网络口令可防范大多数DoS 攻击。
蠕虫需要人的参与才能扩散，而病毒不需要。
侦测攻击本质上始终是电子攻击，例如ping 扫描或端口扫描。
暴力攻击会尝试使用字符集组合来搜索每个可能的口令。
内部设备不应该完全信任DMZ 中的设备，应该对DMZ 和内部设备之间的通信进行身份验证以防范端口重定向等攻击。
3.用户无法访问公司服务器。
系统日志显示服务器运行缓慢，因为它正在收到具有高优先级的虚假服务请求。
这是什么类型的攻击？3侦测访问DoS蠕虫病毒特洛伊木马4.IT 主管发起了一项活动，旨在提醒用户避免打开来源可疑的电子邮件。
该IT 主管意在保护用户免受哪种攻击？3DoSDDoS病毒访问侦测5.下列关于预防网络攻击的说法中哪两项正确？（选择两项。
）35现代服务器和PC 操作系统具有可以信赖的默认安全设置。
入侵防御系统可以记录可疑的网络活动，但在没有用户干预的情况下无法对抗正在进行的攻击。
物理安全威胁的防范包括控制对设备控制台端口的访问、标识关键电缆、安装UPS 系统以及提供温湿控制。
防止网络钓鱼攻击的最好方法是采用防火墙设备。
更改默认的用户名和口令并禁用或取消不必要的服务有助于加强设备安全性。
新标准大学英语2Unit 4习题答案
Unit 4 News 24/7Active Reading (1)Reading and Understanding3. Choose the best answer to the questions1.c2.a3.c4.d5.a6. a7.cDealing with unfamiliar words4. Answer the questions about the words in the box.1. No, it is made more exciting in some way.2. A very long time, centuries.3. They should follow the guidelines.4. They should check the source.5. They live in poverty.6. It is image.7. It is element.5. Match the words in the box with their definitions.1.chase2.trainee3.erode4.odd5.horror6.startle7.echo8.reaction9.frame6. Complete the sentences with the correct form of the words in Activity 5.1.reactions…horror2.chase3.echoes4.startled5.trainees6.eroded7.oddest8. frame7. Answer the questions about the words.1.a2.b3.a4.b5.b6.aReading and interpreting8. Decide what evidence there is for the following statements. If there is no evidence, decide what the passage really says.1. This is not the passage. It is noted that bad news is common, but no judgment as to the desirability or otherwise of this is given.2. Many people, we are told, reacted in the same way to bad news in the case of 9/11 and the assassination of President Kennedy, so such a reaction is normal.3. Yes, as and example is given of people feeling a need to pass on the bad news they had heard. (See pare 2: Their first instinct was to go and tell someone else about it.)4. Yes. (See para4: We seek the odd and unexpected.)5. Not stated –the passage says such issues never seem to have the same impact because the stories are ongoing and not reported in all newspapers on the same day, but bit by bit here and there.6. Immediacy is part of news so such an item is certainly potentially news, but of course it might be too trivial to really be considered such.7. Yes, mostly.8. No. Paragraph 8 says the camera position has an important effect on how viewers understand the story.9. The passage mentions people talk of the power of the press, but does not really comment on it; though the use of the rather negative covertly might hint disapproval.9. Decide why italics are used in the sentences.1. To take the place of quotation marks.2. For emphasis.3. To give the name of a newspaper.4. To introduce a new term.Active Reading (2)Dealing with unfamiliar words3. Match the words and expressions in the box with their definitions.1.assignment2.editorial3.revenue4.close down5.survey6.rely on7. feedback8.bureau4. Complete the conversation with the correct form of the words and expressions in Activity3.1.assignment2.bureau3.rely on4.feedback5.surveys6.editorial7.revenue8.close down5. Replace the underlined words with the correct form of the words in the box.1.capture2.extablished; Nevertheless3.estates4.integritypact; Moreover6.journalism6. Answer the questions about the words and expressions.1.b2.a3.a4.b5.b6.a7.a8.a9.bReading and interpreting7. Look at the sentences from the passage and choose the best meaning.1.a2.a3.b4.b5.a6.bLanguage in useWord formation1.Replace the underlined words with compounds made from down and the words inbrackets.1.downtown2.download3.downgrade4.downstairs5.downmarket6.downturn2. Replace the underlined words with phrasal verbs made from the verbs in brackets and down.1.go down2.turned me down3.run down4.stand down5.got down6.handed down7.brought down8.broke down3. Rewrite the sentences using by someone + participle.1.The late-night edition of the paper was bought by a lot of people interested in the results of the match.2. The princess was followed across the town by photographers determined to get a photo of her.3. The programme was watched by millions of people hoping to win the star prize.4. The alarm was set off by tow children startled to hear a noise in the back room.5. The police were contacted by one of the boys’ mothers worried that he might have got lost.6. The front-page headlines were changed by the editor hoping to be the first to break the news.7. Online editions of the news papers are being read by more and more people not wanting to buy the traditional edition.So + inversion + that4. Rewrite the sentences using So + inversion + that.1. So odd was the newsreader’s accent that I couldn’t understand what she was saying.2. So incredibly bad was the language on that programme that I switched off the TV.3. So exaggerated was the story that it had to be completely rewritten.5. So great was the distance from one region to the next that we had to travel by plane.6. So slow were Frank’s reactions that he wasn’t able to avoid hitting the car in front.5. Translate the sentences into Chinese.1. 一个事件光有客观重要性还不够—世界上有大量全球性的大问题，都会造成戏剧性的后果，从贫困问题到全球变暖问题—但由于它们都是进行中的，并不都会在同一天成为头条。
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。
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1下列哪两项是路由器的功能？（选择两项。
）连接多个 IP 网络。
通过使用第 2 层地址控制数据流。
确定发送数据包的最佳路径。
管理 VLAN 数据库。
扩大广播域。
答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.22为了将数据包发送到远程目的地，必须对主机上的哪三条信息进行配置？（请选择三项。
）hostnameIP 地址子网掩码默认网关DNS 服务器地址DHCP 服务器地址答案答案最高分值 correctness ofresponse Option 2, Option 3, and Option 4 are correct. required.33请参见图示。
如图所示，网络管理员已配置了 R1。
当管理员检查串行接口的状态时，接口显示闭。
要打开 R1 的串行接口，必须在其中额外输入什么命令？ipv6 enableclockrate 128000endno shutdown答案 答案 最高分值correctness of response Option 424哪一项功能可以将路由器与第 2 层交换机区别开来？路由器可以配置 IP 地址。
交换机不能。
交换机将数据包从一个物理接口转发到另一个物理接口。
路由器不是这样。
交换机使用信息表确定如何处理数据流量。
路由器不是这样。
路由器支持多种类型的接口。
交换机通常支持以太网接口。
答案 答案 最高分值correctness of response Option 425为了使路由器能够手动将指定的网络前缀与自动生成的接口标识符相组合在一起，可以使用哪由器接口上配置 IPv6 地址？ipv6 enableipv6 address ipv6-address/prefix-lengthipv6 address ipv6-address/prefix-length eui-64ipv6 address ipv6-address/prefix-length link-local答案 答案 最高分值correctness of response Option 326启用了 IPv6 接口要求的最低地址类型是什么?环回唯一本地本地链路静态全局单播答案 答案 最高分值correctness of response Option 327哪两条信息会显示在 show ip interface brief 命令的输出结果中？（请选择两项。
）IP 地址MAC 地址第 1 层状态下一跳地址接口描述速度和双工设置答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.28当一台计算机第一次 ping 另一台计算机时，需要将什么类型的消息放在网络上以确定另一台地址？一个ICMP ping一个 ARP 请求一条 RFI （信息请求）消息发送给所有连接到本地网络的第 3 层设备的组播答案 答案 最高分值correctness of response Option 229请参见图示。
PC1 试图连接到 File_servARP 请求以获取目的 MAC 地址。
ARP 应答中，PC1 会接收哪个 MAC 地址？S1 的 MAC 地址R1 上 G0/0 接口的 MAC 地址R2 上 G0/0 接口的 MAC 地址S2 的 MAC 地址File_server1 的 MAC 地址答案 答案 最高分值correctness of response Option 2210数据包从公司一个网络中的主机传输到同一家公司远程网络中的设备上。
如果未对数据包执行据包从源设备到目的设备的传输过程中哪两项保持不变？（请选择两项。
）目的 IP 地址源 ARP 表 源 IP 地址 源 MAC 地址目的 MAC 地址第 2 层报头答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.2•11哪个地址会因为数据包在多个第 3 层以太网跳中传输至最终目的地而发生变动？源IP目的IP第 2 层源地址目的端口答案 答案 最高分值correctness of response Option 3212当执行“AND”操作以确定目的地址是否在同一个本地网络中时，主机设备会使用以下哪两项？项。
）目的 IP 地址目的 MAC 地址源 MAC 地址 子网掩码 网络号答案答案 最高分值答案 答案 最高分值correctness of response Option 1 and Option 4 are correct.213请参见图示。
路由器将如何处理目的 IP 地址为 192.168.12.227 的数据包？丢弃数据包。
将数据包从 Serial 0/0/0 接口发送出去。
将数据包从 GigabitEthernet0/0 接口发送出去。
将数据包从 GigabitEthernet0/1 接口发送出去。
答案 答案 最高分值correctness of response Option 2214下列哪两项说确描述了管理距离和度量的概念？（请选择两项。
）管理距离是指特定路由的可信度。
路由器会首先安装具有较高管理距离的路由。
网络管理员无法修改管理距离的值。
到目的地的度量最小的路由即为最佳路径。
度量总是根据跳数来确定。
度量取决于第 3 层路由协议，如 IP 。
答案 答案 最高分值correctness of response Option 1 and Option 4 are correct.215请参见图示。
网络管理员在 R1 上发出 show ip令。
哪两种类型的路由会在路由表中显示？（请选择两项。
）静态路由本地主机路由直连网络通过 OSPF 路由协议获取的路由通过 EIGRP 路由协议获取的路由答案 答案 最高分值correctness of response Option 2 and Option 3 are correct.216请参见图示。
网络管理员在 R1 上发出 show ipv6 route 命令。
从路由表中可以得出哪两条结论？（请选择两项。
）R1 不知道任何通向远程网络的路由。
FF00::/8 网络是通过静态路由命令安装的。
接口 Fa0/1 已配置了 IPv6 地址 2001:DB8:ACAD:A::12。
目的网络为 2001:DB8:ACAD:2::/64 的数据包将通过 Fa0/1 进行转发。
目的网络为 2001:DB8:ACAD:2::54/128 的数据包将通过 Fa0/0 进行转发。
答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.217网络管理员使用 ip address 172.16.1.254 255.255.255.0 命令配置路由器 R1 上的接口 f 当管理员发出show ip route 命令时，路由表没有显示直连网络。
此问题的可能原因是什么接口 fa0/0 未被激活。
需要先保存配置。
目的网络为 172.16.1.0 的数据包未被发送到 R1。
IPv4 地址的子网掩码不正确。
答案 答案 最高分值correctness of response Option 1218网络管理员通过 ip route 0.0.0.0 0.0.0.0 209.165.200.226命令配置路由器。
此命令的用将所有数据包转发到 IP 地址为 209.165.200.226 的设备将目的网络为 0.0.0.0 的动态路由添加到路由表中将目的网络为 0.0.0.0 的数据包转发到 IP 地址为 209.165.200.226 的设备提供一个路由，以转发路由表中没有路由的数据包答案 答案 最高分值correctness of response Option 4 219网络管理员正在为某公司执行动态路由协议。
管理员可以在路由器上输入哪个命令以显示所支议？Router(config)# router ?Router(config)# service ? Router(config)# ip route ?Router(config)# ip forward-protocol ?答案 答案 最高分值correctness of response 2 points for Option 1 2 20请参见图示。
网络管理员在 R2 上发出 show ip route 命令。
哪两种类型的路由被安装 在路由表中？（请选择两项。
）已配置的默认路由直连网络通过 OSPF 路由协议获取的路由通过 EIGRP 路由协议获取的路由网络 209.165.200.224 已配置的静态路由答案 答案 最高分值correctness of response Option 2 and Option 4 are correct.221示。
show ip route 命令行中突出显示的字段的作用是什么？表示这是一个默认路由。
表示该路由是通过 EIGRP 获取的。
表示这是一个直接连接的路由。
表示已经将此路由从路由表中删除。
答案 答案 最高分值correctness of response Option 2222以下哪种说确描述了路由器动态获知的路由？由路由协议动态更新和维护。
不受网络拓扑变化的影响。
管理距离为 1。
在路由表中的前缀为 C 。
答案 答案 最高分值correctness of response Option 1223填空题。
当路由器收到数据包时，它会检查数据包的目的地址并查看正确答案： 路由 24答案 答案 最高分值Options matched to the correct selection. Click on the question mark at the bottom of the item for the correct answer. There is no partial credit.2 route source protocol = D (which is EIGRP) destination network = 10.3.0.0metric = 21024000administrative distance = 1next hop = 172.16.2.2route timestamp = 00:22:15。