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Q:

The exhibit below shows the output of a show ip interface brief on a Cisco router.

r1#show ip interface brief

Serial0/0 does not respond to ping requests. What step would you take to resolve the problem?

A) Change ip address on Serial0/0 B) Enable the interface Serial0/0
C) Check the physical connection in Serial 0/0 D) The interface looks fine in status up, problem must be somewhere else
 
Answer & Explanation Answer: C) Check the physical connection in Serial 0/0

Explanation:

In order for an interface to work properly and respond to ping requests, both Status and Protocol must be up.

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Q:

After the devices have been configured as shown, it is determined that the branch office in Chicago doesn't have connectivity to the Internet through the headquarters in Dallas. How would you fix the problem?

A) Change ip address on the WAN side of the Chicago router B) Change ip address on the LAN side of the Chicago router
C) Change ip address on the LAN side of the Dallas router D) Change ip address on the WAN side of the Dallas router
 
Answer & Explanation Answer: A) Change ip address on the WAN side of the Chicago router

Explanation:

192.168.20.3/30 is not a valid ip address, should be 192.168.20.1/30

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Q:

The network with ip address 192.168.100.0/27 is to be used on a router. If ip subnet-zero is configured, which statement describe the resulting number of available subnets and hosts?

A) 7 usable subnets, each with 32 host addresses B) 8 usable subnets, each with 30 host addresses
C) 8 usable subnets, each with 27 host addresses D) 7 usable subnets, each with 24 host addresses
 
Answer & Explanation Answer: B) 8 usable subnets, each with 30 host addresses

Explanation:

Because subnet zero is configured and we have a class C address (192.168.100.0) then the network portion will have 3 bits so 8 subnets will be available. The rest of the bits, 5, represent the available hosts, so 2^5=32, but only 30 are available, 0 ad 31 are network and broadcast respectively.

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Q:

If two laptops are exchanging data directly with each other using a 802.11g connection, there are said to be in what mode?

A) Ad-hoc mode. B) Operational exchange mode.
C) Basic Service Set mode. D) Infrastructure mode.
 
Answer & Explanation Answer: A) Ad-hoc mode.

Explanation:
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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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Q:

Which layer of the OSI model is associated with HDLC, Frame Relay and PPP?

A) The Physical Layer B) The Data Link layer
C) The Transport Layer D) The Network Layer
 
Answer & Explanation Answer: B) The Data Link layer

Explanation:
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Q:

Which layer of the OSI model is associated with LAN switches?

A) The Transport layer. B) The Physical layer.
C) The Network layer. D) The Data Link layer.
 
Answer & Explanation Answer: D) The Data Link layer.

Explanation:
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Q:

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You are the administrator of network X. You decided to implement RIP in the following topology (click exhibit). You do not want R3 to receive RIP updates. What configuration changes need to be implemented?

A) Implement a passive-interface on R1 B) Nothing needs to be configured
C) Create a sub-interface on R1 D) Change the routing protocol to OSPF
 
Answer & Explanation Answer: A) Implement a passive-interface on R1

Explanation:

Explanation: To block RIP broadcasts on an interface connected to a subnet of a RIP-enabled network add the passive-interface command to the RIP Process

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