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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:

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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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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Q:

What is the meaning of amber SYST led on a 2960 switch?

A) This is normal operation B) There is a bridging loop
C) The switch IOS is loading D) The switch failed its POST
 
Answer & Explanation Answer: D) The switch failed its POST

Explanation:

Explanation: When the switch failed its POST, Power-On Self Test, the SYST led will turn amber and the IOS did not load

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Q:

What command will change the hostname of a router?

A) router#host name new name B) router(config-router)#hostname new name
C) router>host name new name D) router(config)#hostname new name
 
Answer & Explanation Answer: D) router(config)#hostname new name

Explanation:

Explanation: To specify or modify the host name for the network server, use the hostname command in global configuration mode.

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