CiscoCCNA考试56题(5)

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# S9 \2 p) i$ R( [45. which command will start the process for creating a cisco ios file image backup to a network file server? a.) copy ios tftp b.) copy ios network c.) copy tftp flash d.) copy flash tftp e.) copy ios flash  
d the ios is stored in flash. the command format is: copy 学生大 [destination]  
46. how do you determine which standard ip access lists are applied to interface e0 ? a.) show ip access-list b.) show access-lists c.) show ip interface e0 d.) show interface e0 e.) show access-list e0  
c to see which specific protocol access-lists are bound to the interface, show ip int e0 or show ipx int e0 the command ’show access-lists’ will display all access lists that exist, not just the ones bound to a certian interface.  
47. 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.  
48. 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  
. o' D( F0 C- ~3 j5 y; W6 c49. which subnet is the host 200.1.1.67 /26 on? a.) 200.1.1.32 b.) 200.1.1.128 c.) 200.1.1.0 d.) 200.1.1.16 e.) 200.1.1.64 e shorthand notation /26 = 2 bits in the last octet = decimal 255.255.255.192 shortcut: 256 - 192 = 64. valid subnets are multiples of 64. (64, 128, 192, 256). the closest value to 67 is between 64 (the network) and 127 (the broadcast).  
, J/ A( C6 _" o1 g+ R50. the datalink layer works with which of the following: a.) bits b.) packets c.) frames d.) globules e.) segments  
c physical - bits datalink - frames network - packets  
0 ^  X# f0 o; E! b' w9 I51. 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  
8 h2 Y. {) ^, V0 o, D5 g: T9 Ud 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.  
52. 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.  
: G$ j- [! ~0 V2 r% c9 F" Z53. what is one way to make more flash memory available? a.) the command: copy flash to rom b.) erase unused images from flash. c.) the command: erase start d.) this isn’t possible. once you write to flash, you must purchase new flash simms. e.) the command: erase flash *.* f.) the command: convert ram to flash  
b you can think of flash as a virtual hard drive, that lets you add or delete files. if you entered the command, ’erase flash’, it would be like formatting that hard drive and wipe out all files and all data. the command ’erase flash *.*’ is not a valid cisco command. by its very definition, flash is electronically erasable.