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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
21、ers across a broad geographic area. It often users transmission devices provided by common carriers. C.A MAN is a network that spans a metropolitan area such as a city or suburban area. D.A MAN is a network that is interconnected by routers and other devices and that functions as a single network. 你
22、的答案:C 27.Which of the following statements best describes a WAN? A.It connects LANs that are separated by a large geographic area. B.It connects workstations, terminals, and other devices in a metropolitan area. It connects LANS within a large building. D.It connects workstations, terminals, and oth
23、er devices within a building. 你的答案:A 28.What do TIA and EIA stand for? Television Industry Association, Electronic Industries Association Telecommunications Industry Association, Electronic Industries Alliance Telecommunications Industry Alliance, Electronic Industries Association Tlphonique Interna
24、tional Association, Elgraphique Industries Alliance 你的答案:B 29.Which topology has all its nodes connected directly to one center point and has no other connections between nodes? BUS Ring Star Mesh 你的答案:C - 30.WHAT is the purpose of VPN? secure connectivity faster public access connection to a privat
25、e network through the internet insecure connection connection to the internet through a private network AC 31.LANs are designed to do which of the following ? (Select all that apply.) Operate within a limited geographic area Allow many users to access high-bandwidth media Connect to the Internet Pro
26、vide full-time connectivity to local services ABD 1.What is one advantage of using fiber optic cable in networks? It is inexpensive It is easy to install It an industry standard and is available at any electronics store. It is capable of higher data rates than either coaxial or twisted-pair cable 你的
27、答案:D 2.A fiber-optic cable transmits multiple streams of LED-generated light. Multimode Multichannel Multiphase None of the above. 你的答案:A 3.What does the twisting of the wires do in a twisted-pair cable? It makes it thinner. It makes it less expensive. It reduces noise problems. It allows six pairs
28、to fit in the space of four pairs 你的答案:C 4.What is an advantage that coaxial cable has over STP or UTP? It is capable of achieving 10 Mbps to 100 Mbps. It is inexpensive. It can run for a longer distance unboosted. None of the above. 你的答案:C 5.Which connector does UTP use? STP BNC RJ-45 RJ-69 你的答案:C
29、6.How many pairs of wires make up a UTP cable? 2 4 6 8 你的答案:B 7.What is the maximum cable length for STP? 100 feet 150 feet 10 meters 100 meters 你的答案:D 8.Electrons flow in loops called_. Open; voltage Closed; voltage Open; circuits Closed, circuits 你的答案:D 9.Which of the following regarding electrici
30、ty is untrue? Opposite charges react to each other with a force that causes them to be attracted to each other. Like charges react to each other with a force that causes them to repel each other. In the case of opposite and like charges, the force increases as the charges move closer to each other.
31、None of the above. 你的答案:D - 10.What is the importance of the EIA/TIA standards? Select all that apply. They provide a framework for the implementation of the OSI reference model. They provide guidelines for manufacturers to follow to ensure compatibility They provide the minimum media requirements f
32、or multiproduct and multivendor environments. None of the above. BC 1.Using analog modem connections, how many modems would it take to allow connection from 10 computer? 1 5 10 15 你的答案:C 2.What was the first type of microcomputer network to be implemented? MAN WAN LAN PAN 你的答案:C 3.Which OSI layer is
33、 responsible for reliable data transport? Transport Application Data Link Network 你的答案:A 4.At which OSI layer are file formats such as GIF,JPEG,and TIFF implemented? Application Network Transport Presentation 你的答案:D 5.Which best describe the structure of an encapsulated data packet? Segment header,
34、network header, data ,frame trailer Segment header, network header, data ,segment trailer Frame header, network header, data, frame trailer Frame header, segment header, data, segment trailer 你的答案:C 6.At which OSI layer does routing occur? Layer 2 Layer 3 Layer 4 Layer 7 你的答案:B 7.Which data link sub
35、layer communicates with the physical layer? Logical Link Control Media Transport Media Access control Physical Link Control 你的答案:C 8.With which OSI layer is the term frame associated? Physical Network Session Data Link 你的答案:D 9.With which OSI layer is the term packet associated? Physical Data Link N
36、etwork Application 你的答案:C 10.At which OSI layer can FTP and SMTP be found? Network Application Transport Physical 你的答案:B 11.Which OSI layer defines physical addressing? Data Link Physical Transport Network 你的答案:A 12.Which OSI layer is responsible for logical addressing? Data Link Physical Transport
37、Network 你的答案:D 13.Which OSI layer defines voltage levels, maximum transmission distance ,and physical connectors? Application Transport Physical Data Transport 你的答案:C 14.Which OSI layer is the first layer to process information from a transmitting computer? Physical Data Link Transport Application 你
38、的答案:D 15.Which organization developed the OSI model? IEEE ISO Cisco ITU 你的答案:B 16.At which layer of the OSI model do transparent bridges operate? Layer 1 (Physical) Layer 3 (Network) Layer 2 (Data Link) Layer 7 (Application) 你的答案:C 17.What is an adjustable amount of data that can be sent without an
39、acknowledgement? Congestion Avoidance Source Quench Connectionless Windowing 你的答案:D 18.Sequencing acknowledgments, and follow control are characteristics of which OSI layer? Layer 4 (Transport) Layer 3 (Network) Layer 5(Session) Layer 2 (Data Link) 你的答案:A 19.At which layer of the OSI model does NetB
40、IOS operate? A Layer 3 (Network) Layer 5(Session) Layer 4 (Transport) Layer 1 (Physical) 你的答案:B 20.What is a name for a type of RAM in a Cisco router? DRAM Read Active Memory NVRAM PCMCIA EPROM 你的答案:D 21.Which of the following represents 172.30.16.254 in binary format? 11000000.00011110.00020000.11111110 10110000.00011110.00011110.11111110 10101100.00011110.00011110.11111110 None of these 你的答案:D 22.What is the decimal number 151 in binary ? 10100111 10010111 10101011 100