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

1. 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) The overflow is not a problem, because both TCP and UDP packets get randomly dropped and traffic will back out.
D) Mixing TCP and UDP in the same class is not supported.

2. Refer to the exhibit.

A customer reports that data between their sites across your network is very slow and that
voice and video quality are unacceptable. Packet traces of data coming in from and going out to the customer confirm that many packets are being dropped in your network, and many of those that are not dropped are being remarked to CS1. Class maps and a policy map configured as shown are applied inbound to the Fast Ethernet interfaces that connect the customer. What could be the problem?

A) The customer data is being rate limited, but is not being queued by class, which is causing tail drops and packet remarking.
B) The CIR and PIR values appear to have been configured using kbps when the entries are bps.
C) The match criteria is DSCP and the customer packets are being sent marked using IP precedence.
D) All traffic is matching the class class-default, because all other classes are match-all with multiple match criteria.

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

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

4. Where would you apply WRED to avoid congestion and poor QoS from oversubscription of the network?

A) wherever there is a potential bottleneck
B) wherever there is a potential bottleneck and most traffic is UDP
C) wherever there is a potential bottleneck and traffic is delay-intolerant
D) wherever there is a potential bottleneck and most traffic is TCP
E) wherever there is a potential bottleneck and most traffic is voice

5. What are two benefits of the DiffServ model? (Choose two.)

A) Its class-based mechanisms are simple and scale well.
B) It provides absolute guarantees of service quality.
C) Service quality can be tailored to the needs of many different types of traffic.
D) It does not require setting up an end-to-end signaling mechanism.

Solutions: