思科认证考试（ＣＣＮＡ）考试模拟题２０—３９及答案

Questions 

20. [TxNx] If Host A sends a packet to Host B over token ring, and Host B is not active: 

a) The packet will time out. 
b) The packet will be removed by Host A. 
c) The NVRAM of Host B will remove the packet. 
d) The packet will "die" when it reaches the terminator. 
e) The packet will be removed by the token monitor. 

21. [TxNx] If Host A sends a packet to Host B over token ring: Host A dies after transmitting, and Host B is not active: 

a) The packet will time out. 
b) The packet will be removed by Host A. 
c) The NVRAM of Host B will remove the packet. 
d) The packet will "die" when it reaches the terminator. 
e) The packet will be removed by the Active monitor. 

22. [FxNx] BECN and FECN are: 

a) Used to provide keepalives in a Frame Relay environment 
b) Used to provide error checking in a Frame Relay environment 
c) Used to provide congestion information in a Frame Relay environment 
d) Used to provide flow control parameters in a Frame Relay environment 
e) BECN and FECN are not used in a Frame Relay environment. 

23. [RxNx] Which of the following are benefits of a Link-State routing protocol? (Choose all that apply.) 

a) Allows the use of a more robust addressing scheme. 
b) Allows for a larger scalable network 
c) Reduces convergence time 
d) Allows "supernetting" 
e) All of the above. 

24. [OxNx] Which of the following are reasons for the OSI model? 

a) Standardizes interfaces 
b) Allows modular engineering 
c) Facilitates learning and teaching 
d) All of the above. 

25. [RxNx] Which of the following is NOT a ROUTING protocol: 

a) OSPF 
b) RIP 
c) IPX 
d) EIGRP 
e) NLSP 

26. [RxNx] Which statement is NOT true about link state protocols: 

a) Link state advertisements are sent to all routers in an area. 
b) Each router executes the SPF algorithm. 
c) Link state routers keep a topological database of the network. 
d) Link state routers include the originating router s routing table. 
e) Link state routers know of possible alternate paths to a particular network. 

27. [RxNx] Which of the following would NOT appear in a routing table? 

a) Next hop address 
b) Interface Port references 
c) MAC address 
d) Network address 
e) Metrics 

28. [OxNx] Which statement is true of the Datalink OSI layer ? 

a) 802.3 is the MAC sub layer. 
b) No such thing 
c) MAC sublayer provides the connection to the network layer. 
d) MAC sublayer uses SAPS to access the network layer. 
e) SAP sublayer uses the MAC layer to access the LAN medium.