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 CISCO Certification Questions

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Q:

What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?

A) 15 B) 16
C) 30 D) 31
 
Answer & Explanation Answer: C) 30

Explanation:

A/27 (255.255.255.224) is 3 bits on and 5 bits off. This provides 8 subnets, each with 30 hosts. Does it matter if this mask is used with a Class A, B, or C network address? Not at all. The number of host bits would never change.

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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:

You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers  need to be  checked. What command will display the required information?

A) show ip eigrp adjacency B) show ip eigrp topology
C) show ip eigrp interfaces D) show ip eigrp neighbors
 
Answer & Explanation Answer: D) show ip eigrp neighbors

Explanation:

The show ip eigrp neighbors command allows you to check the IP addresses as well as the retransmit  interval and queue counts for the neighbors that have established an adjacency.

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Q:

What is the full IPv6 address represented by FF02::130F:5?

Answer

FF02:0000:0000:0000:0000:0000:130F:0005

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Subject: CCNP

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Q:

What is the first thing that BGP checks to determine if a prefix is accessible?

Answer

BGP checks the NEXT_HOP attribute to determine if the NEXT_HOP is accessible or in the IP routing table.

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Subject: CCNP

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Q:

If you wanted administrators to see a message when logging into the router, which command would you use?

A) message banner motd B) banner message motd
C) banner motd D) message motd
 
Answer & Explanation Answer: C) banner motd

Explanation:

The typical banner is a message of the day (MOTD) and is set by using the global configuration mode command banner motd.

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Q:

A device on a network is ready to send a frame. What is the first thing that CSMA/CD logic does?

A) Sends a token out to instruct other devices not to send packets. B) Sends a jamming signal out to prevent other hosts from sending packets.
C) Sends a discovery message out to find out if the destination host is on the same subnet. D) Listens to see if the Ethernet is busy.
 
Answer & Explanation Answer: D) Listens to see if the Ethernet is busy.

Explanation:
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0 2916
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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