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Q:

Which of the following is the best description of the operation of split horizon?

A) Information about a route should not be sent back in the direction from which the original update came B) It splits the traffic when you have a large bus (horizon) physical network
C) It holds the regular updates from broadcasting to a downed link D) It prevents regular update messages from reinstating a route that has gone down
 
Answer & Explanation Answer: A) Information about a route should not be sent back in the direction from which the original update came

Explanation:

A split horizon will not advertise a route back to the same router it learned the route from.

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Q:

You need to gather the IP address of a remote switch that is located in Hawaii. What can you do to find the address?

A) Issue the show ip route command on the router connected to the switch B) Issue the show cdp neighbor command on the router connected to the switch
C) Issue the show ip arp command on the router connected to the switch D) Issue the show cdp neighbors detail command on the router connected to the switch
 
Answer & Explanation Answer: D) Issue the show cdp neighbors detail command on the router connected to the switch

Explanation:

Although option A is certainly the "best" answer, unfortunately option E will work just fine and your boss would probably prefer you to use the show cdp neighbors detail command.

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Q:

You are troubleshooting a connectivity problem in your corporate network and want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault. What IOS user exec command should you issue?

A) Router>ping B) Router>trace
C) Router>show ip route D) Router>show interface
 
Answer & Explanation Answer: B) Router>trace

Explanation:

The command traceroute (trace for short), which can be issued from user mode or privileged mode, is used to find the path a packet takes through an internetwork and will also show you where the packet stops because of an error on a router.

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Q:

Which commands loads a new version of the Cisco IOS into a router?

A) copy flash ftp B) copy ftp flash
C) copy flash tftp D) copy tftp flash
 
Answer & Explanation Answer: D) copy tftp flash

Explanation:

The command copy tftp flash will allow you to copy a new IOS into flash memory on your router.

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Q:

At which layer of the OSI model would you assume the problem is if you type show interface serial 1 and receive the following message?

Serial 1 is down, line protocol is down

A) Physical layer B) Data Link layer
C) Network layer D) None
 
Answer & Explanation Answer: A) Physical layer

Explanation:

If you see that a serial interface and the protocol are both down, then you have a physical layer problem. If you see serial 1 is up, line protocol is down, then you are not receiving (Data Link) Keepalives from the remote end.

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Q:

Which  of the following commands sets the secret password to Cisco?

A) enable secret password Cisco B) enable secret cisco
C) enable secret Cisco D) enable password Cisco
 
Answer & Explanation Answer: C) enable secret Cisco

Explanation:
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Q:

Which of the following commands will configure all the default VTY ports on a router?

A) Router#line vty 0 4 B) Router (config) #line vty 0 4
C) Router (config-if)#line console 0 D) Router(config)#line vty all
 
Answer & Explanation Answer: B) Router (config) #line vty 0 4

Explanation:

From global configuration mode, use the line vty 0 4 command to set all five default VTY lines

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Q:

Which command will show you whether a DTE or a DCE cable is plugged into serial 0?

A) sh int s0 B) sh int serial 0
C) show controllers s 0 D) show serial 0 controllers
 
Answer & Explanation Answer: C) show controllers s 0

Explanation:

The Show controllers serial 0 command will show you whether either a DTE or DCE cable is connected to the interface. If it is a DCE connection, you need to add clocking with the clock rate command

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