CiscoCCNA考试56题(6)

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54 cisco routers can load a particular image of the cisco ios from flash. which command listed below will cause the router to load ’c2500-11-3.bin’ from flash at next boot? a.) boot system c2500-11-3.bin b.) boot system flash c2500-11-3.bin c.) you can not have more the one ios image in flash. d.) boot system file c2500-11-3.bin e.) boot system rom  
" i' ]! }$ m: W) F  T& Sb router(config)#boot system flash ? word configuration filename  
55 what is the regional telco Office called, where the customers local loop terminates? a.) cpe b.) dce c.) demarc d.) co e.) dte  
d the central office (co) is the telephone company (telco) location nearest you.  
56 which protocol resolves an ip address to a mac address? a.) dns b.) dhcp c.) arp d.) rarp e.) nbp  
c the address resolution protocol (arp) sends out a broadcast to determine the mac address from the ip address.  
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640-407  
* |8 o  B: ~& D& Xround 2 enjoy.  
7 n( X) h) J9 ^! ?1. which isdn specification deals with call setup and teardown? a.) j-series b.) f-series c.) q-series d.) i- series e.) world series  
c the 2 most important isdn specifications are q & i: q = call setup and teardown. i = concepts and terminology.  
2. which command will set a routers network name to ’myrouter’? a.) network name myrouter b.) display myrouter c.) hostname myrouter d.) name myrouter e.) network myrouter  
c  
* w- N6 [  B2 C' u3. when a distance vector routing protocol detects that a connected network has gone down, it sends out a special routing update packet, telling all directly connected routers that the distance to the dead network is infinity. this is an example of which routing technology? a.) only link state routing protocols have this intelligence. b.) poison reverse. c.) triggered updates. d.) garrison-4. e.) icmp. f.) split horizon.  
b instead of just removing the route from the routing update, poison reverse sets the distance to ’infinity’ (for ip rip this is a hop count of 16). this immediately makes the route invalid for all neighboring routers.
4 what is the standard isdn term for a native isdn modem? a.) te3 b.) et c.) le d.) te2 e.) ta  
: D" M0 a. V9 b+ [0 `! R9 m+ Q  ke the marketing term ’isdn modem’ was created to help sell the isdn idea to america. there is no such thing as an analog modulator demodulator for digital isdn. the terminal adapter (ta) allows you to connect a pc to a digital isdn line directly. in the real world, isdn is digital, modems are analog.  
5 which of the following are transport layer protocols? (3 answers) a.) nfs b.) spx c.) udp d.) tcp e.) ip  
b c d
5 Y. y0 i, M  f1 i; b6. which command would configure interface e0 with an ip address of 12.23.4.5 using a subnet mask of 255.255.255.0 ? a.) that is an invalid mask for a class ’a’ address b.) ip address 12.23.4.5 /24 c.) ip address 12.23.4.5 255.255.255.0 d.) ip address 12.23.4.5 mask 255.255.255.0 e.) ip address 12.23.4.5 mask ff:ff:ff:0  
9 r2 ]- h( h* E& k3 Qc you can change the way the mask is displayed (bitcount, decimal, hex) but you must enter the subnet mask in dotted decimal. router(config-if)#ip address 12.23.4.5 ? a.b.c.d ip subnet mask  
7. given the ip address 148.90.109.120 with a mask 255.255.255.240. which subnet is this address on? a.) 148.90.109.96 b.) 148.90.109.128 c.) 148.90.109.0 d.) 148.90.109.112 e.) 148.90.109.64 f.) 148.90.109.116  
d with a mask of 255.255.255.240, it should be recognizable that the subnet is 148.90.109.?, the last octet is the hard part. magic number = 256 - subnet mask magic number = 256 - 240 = 16 subnets are multiples of the magic number: 16,32,48,64,80,96,112,128,144…. as close to 113 without going over is .. 112 so the answer is 148.90.109.112.