思科认证：CCNA认证考前精选模拟试题8

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思科考试是随报随考，在复习的过程中中还是不够全面，为了帮助广大考生系统全面的复习好《思科认证：CCNA认证学科》，我们考吧网整理了思科认证模拟试题，本次汇编的模拟试题希望对你的考试有所帮助，预祝你考试顺利。

1. station a is transmitting data to station b, and expects an acknowledgment after every 400 bytes. after trasmitting data for a while, the two stations determine the line is reliable and change to expecting and acknowledgement every 600 bytes. this is an example of (pick the best answer only):

a.) count to infinity b.) becn c.) countdown timers d.) sliding windows e.) split horizon f.) poison reverse

d a tcp/ip ’window’ is the amount of data (number of bytes) that the sending station will trasmit before expecting an acknowledgement back. if the stations can change that window size on the fly, that is called a sliding window. this is done to optimize performance.

2. the cisco discovery protocol (cdp) uses advertisements and discoveries. how does it send this information?

a.) over a snap-capable link. b.) layer 3 broadcast. c.) cdp does not use advertisements. d.) layer 2 multicast. e.) layer 4 tcp. f.) sap.

a d the cisco proprietary protocol uses multicast, so that only other cisco devices will listen to these packets. cdp requires a snap-capable link to transmit.

3. which command can determine the path a routed packet takes through an internetwork?

a.) telnet b.) traceroute c.) arp d.) plp e.) ping

b traceroute uses a series of icmp ’pings’ with decreasing time-to-live values for each hop to determine the path through a network.

4. in the tcp/ip protocol stack, there are five classes of addresses. which class is used for testing?

a.) b b.) a c.) d d.) c e.) e

e a,b,c are valid for use on the internet d is multicast e is for research

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