2022年2022年计算机网络习题 2.pdf

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1、Your ISP assigned you a full class A address space. From this, you need at least 300 sub-networks that can support at least 50 hosts each. Which of the subnet masks below are capable of satisfying your needs? (Select two). 所选答案：A. 255.255.128.0 C. 255.255.252.0 正确答案：A. 255.255.128.0 B. 255.255.192.0

2、 问题 2得 0 分，满分10 分Which of the following IP hosts would be valid for PC users, assuming that a /28 network mask was used for all of the networks? (Choose all that apply.) 所选答案：A. 83.121.178.93 C. 192.168.19.37 D. 201.45.116.159 正确答案：A. 83.121.178.93 B. 134.178.18.56 C. 192.168.19.37 问题 3得 0 分，满分10 分W

3、hich of the following statements are true regarding a network using a subnet mask of 255.255.248.0? (Choose three) 所选答案：A. It corresponds to a Class A address with 13 bits borrowed 正 确答案：A. It corresponds to a Class A address with 13 bits borrowed C. The network address of the last subnet will have

4、248 in the 3rd octet. D. The subnetwork numbers will be in multiples of 8 问题 4得 10 分，满分10 分图中的家庭网络可能用到了哪些设备? 108.gif所选答案：A. 100Mbps 以太网适配器B. Category 5 双铰线电缆名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 7 页 - - - - - - - - - C. 以太网集线器正确答案：A. 100Mbps 以太网适配器B. C

5、ategory 5 双铰线电缆C. 以太网集线器问题 5得 10 分，满分10 分You have the binary number 10011101. Convert it to its decimal and hexadecimal equiva-lents. (Select two answer choices) 所选答案：B. 0 x9D D. 157 正确答案：B. 0 x9D D. 157 问题 6得 0 分，满分10 分Which of the following devices can an administrator use to segment their LAN? (C

6、hoose all that apply) 所选答案：D. Routers 正确答案：B. Switches C. Bridges D. Routers 问题 7得 0 分，满分10 分Routers perform which of the following functions? (Select Three) 所 选 答案：B. Collision prevention on a LAN segment 正 确 答案：A. Packet switching C. Packet filtering D. Internetwork communication 反馈：Routers can pe

7、rmit and deny traffic using layer 3 and layer 4 packet information.The primary purpose of a router is to route traffic 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 7 页 - - - - - - - - - between different networks, allowing for in-ternetworking. 问题8得0 分，满分10 分

8、Which of the following protocols operate at the Application layer of the OSI model? (Select all valid answers) 所选答案：A. TCP 正确答案：B. Telnet C. FTP 反馈：Layer Name Examples Application (layer 7) Telnet, HTTP, FTP, WWW browsers, NFS, SMTP gateways, SNMP 问题 9得 0 分，满分10 分The TCP/IP network model differs fro

9、m the more popular OSI model. Which of the layers below belong to the TCP/IP model? (Select all that apply) 所选答案：A. Application layer 正确答案：A. Application layer C. Transport layer D. Internet layer 反馈：The architecture of TCP/IP does not use the 6and 5layers. The application layer pro-tocols use the t

10、ransport layer services directly. The OSI transport layer provides connec-tion-oriented service; in TCP/IP, this service is provided by TCP . 问题 10得 0 分，满分10 分There are 2 switches in the Testking LAN, with no routers. Ports 1, 2 & 3 are assigned to VLAN 1 in switch 1 and 2 and ports 4, 5 & 6 are ass

11、igned to VLAN 2 in both switches. These two switches are connected together via a trunked link. Which of the conditions below would verify trunk and VLAN operation? (Select all valid answers) 所选答B. Host 4 on VLAN 2 can not ping Host 1 on VLAN 1 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - -

12、- 名师精心整理 - - - - - - - 第 3 页，共 7 页 - - - - - - - - - 案：正 确答案：A. Host 1 on VLAN 1 can ping Host 2 on VLAN 1 B. Host 4 on VLAN 2 can not ping Host 1 on VLAN 1 C. Host 4 on VLAN 2 can ping Host 2 on VLAN 2 反馈：If there is no router present, only hosts in the same VLAN will be able to ping each other. In

13、 order for any host on one VLAN to communicate with a host on another VLAN, the traffic must pass through a router. Host within the same VLAN will be able to ping each other, even though they reside on different switches, as long as the switches have a trunk connection configured between them. 问题11得

14、0 分，满分10 分The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem? (Choose three) 183.GIF所选答案：A. Ensure that the Ethernet encapsulations match on the interconnected router and switch ports. C. Ensure th

15、at switch has power. 正确答案：B. Ensure that cables A and B are straight-through cables. C. Ensure that switch has power. D. Reseat all cables. 问题12得0 分，满分10 分Regarding the extended ping command; which of the statements below are true? (Select all valid answer choices) 所选答A. The extended ping command is

16、 available from privileged EXEC mode. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 7 页 - - - - - - - - - 案：正确答案：A. The extended ping command is available from privileged EXEC mode. B. With the extended ping command you can specify the timeout value. C. With t

17、he extended ping command you can specify the datagram size. 问题 13得 0 分，满分10 分Within the TestKing office, The Sales and Production networks are separated by a router as shown in the diagram below: Which of the following statements most accurately describes the characteristics of the above networks br

18、oadcast and collision domains? 184.GIF所选答案：B. There are four broadcast domains in the network. 正 确答案：A. There are two broadcast domains in the network. D. There are seven collision domains in the network. 反馈：In this network we have a hub being used in the Sales department, and a switch being used in

19、 the Production department. Based on this, we have two broadcast domains: one for each network being separated by a router. For the collision domains, we have 5 computers and one port for E1 so we have 6 collision domains total because we use a switch in the Production Department so 5 are created th

20、ere, plus one collision domain for the entire Sales department because a hub is being used. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页，共 7 页 - - - - - - - - - 问题 14得 0 分，满分10 分The TestKing network is displayed in the diagram below: Referring to the devices sh

21、own above, which statements are true in this scenario? (Select two) 190.GIF所选答案：A. All the device in both networks will receive a broadcast to 255.255.255.255 sent by host TestKingA 正确答案：B. Only the device in network 192.168.1.0 will receive a broadcast to 255.255.255.255 sent by TestkingA C. Each h

22、ost is in a separate collision domain 反馈：Since the devices shown in the diagram are switches, B is in fact correct. D is not correct. If the diagram used hubs and not switches then yes, there would only be two collision domains, but the diagram has switches. 问题 15得 0 分，满分10 分With regards to bridges

23、and switches, which of the following statements are true? (Choose three) 所选答案：B. Switches typically have a higher number of ports than bridges. 正确答案：A. Both bridges and switches forward Layer 2 broadcasts. B. Switches typically have a higher number of ports than bridges. C. Both bridges and switches

24、 make forwarding decisions based on Layer 2 addresses. 反馈：B, F: Both are layer 2 (data link) devices designed to forward layer 2 broadcasts and multicast ad-dresses. D: Switches do have more ports than bridges. Bridges normally use two ports to bridge LANs to-gether while switches typically come in

25、24 or 48 ports 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页，共 7 页 - - - - - - - - - 问题 16得 0 分，满分10 分Which Layer 1 devices can be used to extend the area covered by a single LAN segment? (Select two) 所选答案：A. hub 正确答案：A. hub B. Repeater 反馈：Both hub, Repeater, Ro

26、uter and Switch repeat the packet. But only hub and Repeater do not seg-ment the network. Repeaters and Hubs are contained in layer one of the OSI model (Physical layer) while a switch lies in layer two and a router is in layer 3. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 7 页，共 7 页 - - - - - - - - -