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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:

What port number is used for FTP control?

A) 20 B) 21
C) 22 D) 25
 
Answer & Explanation Answer: B) 21

Explanation:
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Q:

What port number is used for DHCP?

A) 67 B) 68
C) 69 D) Both A and B
 
Answer & Explanation Answer: D) Both A and B

Explanation:
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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:

What is meant by same layer interaction

A) That a packet is forwarded to a different host that resides in the same layer of the Cisco three layer hierarchical model. B) That an interaction occurs within a single layer of a networking model and that no other layers or devices take any part in the interaction.
C) An interaction that progresses up or down only one level of a networking model. D) That two computers use a protocol defined at the same layer of a networking model to communicate with each other.
 
Answer & Explanation Answer: D) That two computers use a protocol defined at the same layer of a networking model to communicate with each other.

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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Q:

Given the following network range 192.168.0.0/24. We want minimum 50 hosts on each of the available subnets. What will be the subnet mask?

A) /24 B) /25
C) /26 D) /27
 
Answer & Explanation Answer: C) /26

Explanation:

Explanation: 50 hosts require 6 bits of the last octet giving us 64 -2 = 62 possible hosts this satisfies our requirement and leaves us 2 bits over for the subnets. The default mask is /24 or 255.255.255.0 adding the 2 bits for the subnets it becomes 255.255.255.192 or /26

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