Which QoS mechanisms can you use on a converged network to improve VoIP quality?
(Select three)

A.
The use of a queuing method that will give VoIP traffic strict priority over other traffic.
The use of a queuing method that will give VoIP traffic strict priority over other traffic
software voice applications

B.
The use of RTP header compression for the VoIP traffic.
The use of RTP header compression for the VoIP traffic.
multipoint control unit (MCU)

C.
The proper classification and marking of the traffic as close to the source as possible.
The proper classification and marking of the traffic as close to the source as possible
gatekeeper

D.
The use of 802.1QinQ trunking for VoIP traffic.
The trunking method used will have no bearing on the VOIP quality.
QUESTION 164
Which three QoS mechanisms can be configured to improve VoIP quality on a converged
network? Select three.
The use of 802.1QinQ trunking for VoIP traffic
The trunking method used will have no bearing on the VOIP quality.
QUESTION 165
Refer to the exhibit.

What are three of the basic components of a VoIP network? (Choose three.)
call agent

E.
The use of WRED.
The use of WRED for the VoIP traffic
interactive voice response (IVR) systems

D.
The use of 802.1QinQ trunking for VoIP traffic.
The trunking method used will have no bearing on the VOIP quality.
QUESTION 164
Which three QoS mechanisms can be configured to improve VoIP quality on a converged
network? Select three.
The use of 802.1QinQ trunking for VoIP traffic
The trunking method used will have no bearing on the VOIP quality.
QUESTION 165
Refer to the exhibit.

What are three of the basic components of a VoIP network? (Choose three.)
call agent

A.
The use of a queuing method that will give VoIP traffic strict priority over other traffic.
The use of a queuing method that will give VoIP traffic strict priority over other traffic
software voice applications

B.
The use of RTP header compression for the VoIP traffic.
The use of RTP header compression for the VoIP traffic.
multipoint control unit (MCU)

C.
The proper classification and marking of the traffic as close to the source as possible.
The proper classification and marking of the traffic as close to the source as possible
gatekeeper

D.
The use of 802.1QinQ trunking for VoIP traffic.
The trunking method used will have no bearing on the VOIP quality.
QUESTION 164
Which three QoS mechanisms can be configured to improve VoIP quality on a converged
network? Select three.
The use of 802.1QinQ trunking for VoIP traffic
The trunking method used will have no bearing on the VOIP quality.
QUESTION 165
Refer to the exhibit.

What are three of the basic components of a VoIP network? (Choose three.)
call agent

E.
The use of WRED.
The use of WRED for the VoIP traffic
interactive voice response (IVR) systems

D.
The use of 802.1QinQ trunking for VoIP traffic.
The trunking method used will have no bearing on the VOIP quality.
QUESTION 164
Which three QoS mechanisms can be configured to improve VoIP quality on a converged
network? Select three.
The use of 802.1QinQ trunking for VoIP traffic
The trunking method used will have no bearing on the VOIP quality.
QUESTION 165
Refer to the exhibit.

What are three of the basic components of a VoIP network? (Choose three.)
call agent

A.
The use of a queuing method that will give VoIP traffic strict priority over other traffic.
The use of a queuing method that will give VoIP traffic strict priority over other traffic
software voice applications

B.
The use of RTP header compression for the VoIP traffic.
The use of RTP header compression for the VoIP traffic.
multipoint control unit (MCU)

C.
The proper classification and marking of the traffic as close to the source as possible.
The proper classification and marking of the traffic as close to the source as possible
gatekeeper

D.
The use of 802.1QinQ trunking for VoIP traffic.
The trunking method used will have no bearing on the VOIP quality.
QUESTION 164
Which three QoS mechanisms can be configured to improve VoIP quality on a converged
network? Select three.
The use of 802.1QinQ trunking for VoIP traffic
The trunking method used will have no bearing on the VOIP quality.
QUESTION 165
Refer to the exhibit.

What are three of the basic components of a VoIP network? (Choose three.)
call agent

E.
The use of WRED.
The use of WRED for the VoIP traffic
interactive voice response (IVR) systems

F.
softphones

Explanation:
In order to optimize the quality of VOIP calls, QoS should be implemented to ensure that
VOIP traffic is prioritized over other traffic types.
By providing a strict queue for VOIP traffic, you will ensure that voice calls take precedence
over the other traffic types.
In order to properly provide for QoS across the network, the voice traffic should be marked to
give priority as close to the source as possible. This will ensure that the traffic is prioritized
end to end.
Finally, WRED (Weighted Random Early Detection) could be configured to prevent
congestion. WRED can be used to selectively drop less important traffic types, instead of
dropping the voice packets when links become busy.
Incorrect Answers:
B: Compression can be used to lower the bandwidth required to transmit VOIP calls, but it
will not help with improving the voice quality. In general, compression of any kind lowers the
quality of VOIP.

In order to optimize the quality of VOIP calls, QoS should be implemented to ensure that
VOIP traffic is prioritized over other traffic types.
By providing a strict queue for VOIP traffic, you will ensure that voice calls take
precedence over the other traffic types.
In order to properly provide for QoS across the network, the voice traffic should be
marked to give priority as close to the source as possible. This will ensure that the traffic
is prioritized end to end.
Finally, WRED (Weighted Random Early Detection) could be configured to prevent
congestion. WRED can be used to selectively drop less important traffic types, instead of
dropping the voice packets when links become busy.
Incorrect Answers:
B: Compression can be used to lower the bandwidth required to transmit VOIP calls, but
it will not help with improving the voice quality. In general, compression of any kind
lowers the quality of VOIP.

For H.323 VOIP networks the ITU-T H.323 standard specifies four components:
gateway
gatekeeper
terminal
multipoint control unit (MCU)
For MGCP/SCCP VOIP networks the components that make up a VoIP system include a
Signaling Gateway, Call Manager, Call Agent, and Media Gateway Controller.
Reference: http://www.cisco.com/warp/public/788/voip/understand-gatekeepers.html