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

2. Which statement about when you mix TCP and UDP traffic in the same class and overflow occurs is true?

A) UDP traffic suffers more, because TCP guarantees delivery.
B) TCP traffic is starved, because UDP never slows down when packets get dropped.
C) Mixing TCP and UDP in the same class is not supported.
D) The overflow is not a problem, because both TCP and UDP packets get randomly dropped and traffic will back out.

3. Refer to the exhibit.

A customer has commented that voice quality is not meeting expectations when calls cross your network. This voice packet was captured from the egress link to the customer. This capture is representative of the customer's voice packets across your network and the queuing method shown is representative of packet treatment across your network. How might the problem be corrected?

A) Ensure that voice packets are correctly marked when they traverse your network.
B) Increase the bandwidth for the voice class.
C) Enable WRED in the CBWFQs to minimize the possibility of dropping voice packets.
D) Set up multiple priority queues to ensure low latency for voice packets.

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

A) Using WRED will necessitate a large number of dropped packets.
B) WRED is a congestion avoidance technique.
C) 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.
D) WRED should always be used in traffic classes that support a MIX of realtime UDP and TCP traffic.
E) 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.

5. When the customer LAN is managed by the service provider and the network is oversubscribed, what is the best location for use of congestion avoidance mechanisms?

A) in the service provider core
B) on output interfaces from the service provider network leading to the customer LAN
C) on output interfaces from the customer LAN leading into the service provider network
D) in interfaces in the service provider network incoming from the customer LAN

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