CiscoCCNA考试56题(8)

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a b c d e  
% w% ^/ \0 x9 w/ ]# m7 x21 when determining whether or not to route a lan segment, which rule of thumb do you use? a.) 70/30 b.) 80/20 c.) 60/40 d.) 50/50 e.) 90/10  
a the industry standard rule is 80/20, which means 80% local, 20% over the router. however, according to cisco’s online documentation, the answer is 70/30. this makes sense, considering more and more traffic is starting to go from the desktop to an ulimate destination outside the local are network, such as the internet.  
22. for ipx, what is the default cisco encapsulation on an ethernet interface? a.) dix b.) sap c.) gns d.) arpa e.) novell-ether f.) snap  
e  
0 y* ?( W, F! D' h: u9 h: m( {23 which command will display the ipx routing table? a.) show routes protocol=ipx b.) show ipx c.) show ipx route d.) show routes ipx e.) show routes  
c  
24 which of the following are examples of the transport layer? (2 answers) a.) tcp b.) token ring c.) ip d.) udp e.) llc f.) sql  
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25 which command allows a user to see previous commands? (3 answers) a.) show command b.) ctrl-u c.) shift-ctrl-6 d.) ctrl-p e.) show history f.) up arrow  
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26. you would like to back up an image of the ios file that is currently on your router. you have a window 95 machine running a tftp-server program. assuming that you have network connectivity between the router and the tftp-server, what is the command to backup the ios to the windows 95 machine running tftp? a.) write flash b.) copy tftp flash c.) tftp flash: d.) write enable e.) ftp flash: f.) copy flash tftp  
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% ^7 p! w( [8 Y" c7 D27 the internet protocol (ip) occurs at what layer of the seven layer model? a.) transport b.) presentation c.) physical d.) datalink e.) network f.) session  
e ip is a routed protocol that occurs at layer 3. other layer 3 protocols include ipx, appletalk, and decnet.  
) B1 x* o- i* i4 A6 u6 x4 e28. a user device that connects to a dce must be which of the following? a.) demarc b.) cpe c.) dte d.) co e.) dce  
- _. ?* o8 n% D  l4 Ac dte’s are the router side, and receive clocking. dce’s are the dsu/csu side, and provide clocking.  
29 which of the following will allow for 14 hosts per subnet on network 200.1.1.0 ? (3 answers) a.) 200.1.1.0 255.255.255.240 b.) 200.1.1.0 with 4 bits of subnetting c.) 200.1.1.0 255.255.255.248 d.) 200.1.1.0 with 5 bits of subnetting e.) 200.1.1.0 /27 f.) 200.1.1.0 /28  
: ]. T. ?& O3 c2 ?+ Xa b f there are multiple ways to represent that you need 28 bits of subnetting. shorthand /28 = 4 bits = 255.255.255.240 decimal. shortcut: you need 4 bits for the host because 2^4 - 2 = 14 magic number alternate method ------------------- magic numbers are powers of 2. for example: 2,4,8,16,32,64,128 the number of hosts on a subnet is two less than the magic number. to get 14 hosts, the magic number would need to be 16.  
256-magic number = interesting octect of subnet mask 256- 16 =240 so mask is 255.255.255.240  
30. what is a characteristic of store and forward switches? a.) they work at wire speed. b.) they forward the frame before it is completely read. c.) they are the same as cut-through switching in ’prune’ mode. d.) they increase latency. e.) they forward based on transport layer info. d 31. the network portion of an address typically represents a: a.) router b.) computer c.) ethernet mac address. d.) segment e.) host  
d every network segment is represented by a network or subnetwork address.  
5 g; L$ |- p3 x7 l, @, [% z4 _32 which device listed below provides clocking for the line? a.) dte b.) co c.) dce d.) demarc e.) cpe