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Q:

Some colleagues are discussing QoS, and are interested in jitter. What is jitter?

A) Jitter refers to the variation in delay experienced by packets B) Jitter is a flickering effect sometimes seen on streaming video.
C) Jitter is a predefined settings package that provides optimal QoS for IP telephony use. D) Jitter is a clicking noise that can be heard on some VoIP calls. It is caused by loss of UDP packets.
 
Answer & Explanation Answer: A) Jitter refers to the variation in delay experienced by packets

Explanation:
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Q:

What does CSMA/CD stand for?

A) Carrier Sense Multiple Action with Collision Detection. B) Carrier Sense Multiple Access with Collisionless Delivery
C) Carrier Sense Multiple Action with Collision Detonation D) Carrier Sense Multiple Access with Collision Detection
 
Answer & Explanation Answer: D) Carrier Sense Multiple Access with Collision Detection

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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.

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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:

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

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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.

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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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