[工学]思科习题集答案.doc
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1、1.Why was the OSI model created? to ensure the secrecy of proprietary networking technologies to ensure that networks are compatible with each other to slow down the expansion of new technologies to ensure that network administrators receive a high salary to decipher networks 你的答案:B 2.Joan works in
2、the Boston office and needs to connect to the corporate network in Dallas. The type of information that Joan needs to access is very confidential and security is an issue. Which type of network should Joan use? WAN LAN SAN VPN 你的答案:D 3.Which of the following describes a LAN A network that covers a l
3、arger area than a WAN A network that connects workstations, terminals, and other devices in a large metropolitan area A network that connects workstations, switches, and other devices in a geographically limited area A network that serves users across a geographically large area and often uses trans
4、mission devices provided by a common carrier 你的答案:C 4.Which of the following is used to describe the rated throughput capacity of a given network medium? bandwidth baseband delay latency 你的答案:A 5.What is the topology if one central hub has four hubs connected to it, and each of those four hubs has f
5、our workstations attached? A bus A ring A star An extended star 你的答案:D 6.What is/are the function(s) of a AAA server?(Select all that apply.) To ensure that only authenticated users can get into the network To ensure that the users are allowed access to only the resources they need To ensure that re
6、cords are kept of everything the authentic users do after they are allowed entry All of the above 你的答案:D 7.What does a router route? Layer 1 bits Layer 2 frames Layer 3 packets Layer 4 segments 你的答案:C 8.Which of the following is true of a switchs function? Switches increase the size of collision dom
7、ains. Switches combine the connectivity of a hub with the capability to filter or flood traffic based on the destination MAC address of the frame. Switches combine the connectivity of a hub with the traffic direction of a router. Switches perform Layer 4 path selection. 你的答案:B 9.Which of the followi
8、ng is true of a bridge and its forwarding decisions? Bridges operate at OSI Layer 2 and use IP addresses to make decisions. Bridges operate at OSI Layer 3 and use IP addresses to make decisions. Bridges operate at OSI Layer 2 and use MAC addresses to make decisions. Bridges operate at OSI Layer 3 an
9、d use MAC addresses to make decisions. 你的答案:C 10.Repeaters can provide a simple solution for what problem? A.Too many types of incompatible equipment on the network Too much traffic on a network Too-slow convergence rates Too much distance between nodes or not enough cable 你的答案:D 11.In the TCP/IP mo
10、del, which layer deals with reliability, flow control, and error correction? Application Transport Internet Network access 你的答案:B 12.Which of the following best defines encapsulation? Segmenting data so that it flows uninterrupted through the network Compressing data so that it moves faster Moving d
11、ata in groups so that it stays together Wrapping data in a particular protocol header 你的答案:D 13. An e-mail message is sent from Host A to Host B on a LAN. Before this message can be sent, the data must be encapsulated. Which of the following best describes what happens after a packet is constructed?
12、 The packet is transmitted along the medium. The packet is encapsulated into a frame. The packet is segmented into frames. The packet is converted to binary format. 你的答案:B 14.Which layer of the OSI model handles physical addressing, network topology, network access, and flow control? The physical la
13、yer The data link layer The transport layer The network layer 你的答案:B 15.Which of the following is the correct order of the network layers? 1: Physical 2: Data link 3: Transport 4: Network 5: Presentation 6: Session 7: Application 1: Physical 2: Datalink 3: Nerwork 4: Transport 5: Session 6: Presenta
14、tion 7: Application 1: Physical 2: Data link 3: Network 4: Session 5: Transport 6: Application 7: Presentation 1: Physical 2: Network 3: Session 4: Data link 5: Transport 6: Application 7: Presentation 你的答案:B 16.The OSI model has how many layers? Four Five Six Seven 你的答案:D 17.What is the OSI model?
15、A.A conceptual framework that specifies how information travels through networks B.A model that describes how data makes its way from one application program to another throughout a network C.A conceptual framework that specifies which network functions occur at each layer All of the above 你的答案:D 18
16、.What is the movement of data through layers? Wrapping Encapsulation Traveling Transmission 你的答案:B 19.What is the name of the part of a companys LAN that is made available to select parties such as employees, customers, and partners? The Internet The extranet The intranet The LAN 你的答案:B 20. What lin
17、ks enterprise customer headquarters, remote offices, and branch offices to an internal network over a shared infrastructure? Access VPN Intranet VPN Extranet VPN Internet VPN 你的答案:B 21.What was the first type of microcomputer network to be implemented? MAN WAN LAN PAN 你的答案:C 22.Using modem connectio
18、ns, how many modems would it take to allow connections from ten individual computers within the same location? One Five Ten Fifteen 你的答案:C 23.What is the information that is burned in to a network interface card? NIC MAC address Hub LAN 你的答案:B 24. What service offers secure, reliable connectivity ov
19、er a shared public network infrastructure? Internet Virtual private network Virtual public network WAN 你的答案:B 25.Which of the following is not one of the features of a SAN? SANs enable concurrent access of disk or tape arrays, providing enhanced system performance. SANs provide a reliable disaster r
20、ecovery solution. SANs are scalable. SANs minimize system and data availability. 你的答案:D 26.Which of the following statements correctly describes a MAN? A.A MAN is a network that connects workstations, peripherals, terminals, and other devices in a single building. B.A MAN is a network that serves us
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