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Cisco Maintaining Cisco Service Provider Quality of Service (MSPQS) Sample Questions:

1. You work for service provider that employs a four-class service provider QoS model (best effort, bronze, silver, gold). A customer recently reported an issue with high drop rate on a mission-critical database application in the silver class. The silver class is currently at capacity. The gold class is currently only used for voice and video conferencing, and has available bandwidth. The application was remapped to the gold class. Which statements are valid alternative options to this decision? (Choose two.)

A) In addition to the remapping, the provider would have to change the queue model from WFQ to priority queued.
B) Additional bandwidth should have been added to the silver class from one of the lower classes before the traffic class was moved.
C) Moving to a three-class QoS model would allow for more bandwidth per class and would reduce the support of maintaining multiple classes.
D) The provider should consider moving to a six-class QoS model to provide more available classes of service to differentiate traffic.

2. Which Cisco IOS command lists all traffic classifications?

A) show service-policy
B) show qos
C) show policy-map
D) show class-map

3. A customer with an unmanaged CE router has reported experiencing poor quality on the video conferencing and broadcast multimedia applications. To address the issue, the provider has implemented shaping on the PE router to "smooth out" speed mismatches in the network. Which of these is a valid concern with this approach?

A) In addition to shaping, the provider should implement policing so the application can detect the congestion and throttle traffic.
B) Shaping should only be used in a TCP-based environment where the application can detect the congestion and adjust. Shaping provides little benefit with UDP applications.
C) Shaping can only be applied to the outbound interface, which does not prevent the customer from flooding the inbound link to the provider.
D) While shaping may help the broadcast multimedia application, it could cause additional delay in the video conferencing application.

4. What three statements about WRED are true? (Choose three.)

A) Using WRED on the edge devices (CE, PE) is an effective method of implementing
congestion avoidance in the service provider network, because it avoids the congestion prior to reaching the core.
B) WRED is a congestion avoidance technique.
C) WRED should always be used in traffic classes that support a MIX of realtime UDP and TCP traffic.
D) WRED employs a weighted method for determining which packets to drop to avoid congestion. Packets with a higher precedence are less likely to be dropped.
E) Using WRED will necessitate a large number of dropped packets.

5. A customer reports drops for traffic in the BIZ-CRITICAL class. As part of the verification process you identify that there is a high number of random drops. Which of these can help address this problem?

A) Increase the WRED min threshold value for the traffic class.
B) Decrease the queue limit for the traffic class.
C) Enable fair queuing for the BIZ-CRITICAL class.
D) Decrease the WRED drop probability denominator for the class.

Solutions: