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

1. An MPLS VPN customer with managed CE services recently made some changes to their call manager configurations. Now the customer reports that their VoIP traffic voice quality is very poor. What could be a cause of the problem?

A) The traffic shaping rate for the VoIP traffic class is too low.
B) RTP header compression is used for the VoIP traffic class.
C) The customer changed the codec used for voice compression from G.729 to G.711.
D) The VoIP traffic class is not being policed at the CE router egress.
E) The VoIP traffic is being marked as DSCP EF.

2. Refer to the exhibit.

Which queueing method has been configured?

A) MDRR
B) CBWFQ
C) LLQ
D) priority queueing
E) WFQ

3. What are three benefits of IntServ and RSVP? (Choose three.)

A) IntServ networks will reject or downgrade new RSVP sessions if all reservable bandwidth is booked somewhere in a path.
B) They enable the network to guarantee necessary QoS to individual data flows.
C) The IntServ class-based approach is easy to design and implement.
D) RSVP helps network devices identify dynamic port numbers.
E) RSVP signaling is a scalable way to ensure all devices maintain an accurate picture of the network state.

4. Refer to the exhibit.

The service provider uses a three-class service provider QoS model (real-time, critical, best effort). The provider receives reports from a customer about poor quality on their multimedia conferences. The provider recently updated their profiles to include multimedia conferencing (af41) to their real-time class, which includes voice (ef). What are the two most likely causes of this problem? (Choose two.)

A) The SP-REALTIME class should include mpls experimental 4, not 5.
B) The class map for SP-REALTIME does not include the DSCP values for multimedia conferences and voice traffic.
C) The MPLS experimental 3 is in the SP-CRITICAL-DATA class, not the SP_REALTIME class.
D) Multimedia conferencing is included in the SP-CRITICAL-DATA class.
E) The SP-CRITICAL-DATA class should not use random detect for multimedia traffic.

5. When the RFC 3270 Uniform mode is used, the PHB at the egress router is based on which of these?

A) The MPLS VPN label EXP value.
B) The packet is re-evaluated, remarked, and the PHB is based on this new marking.
C) The topmost MPLS label EXP value.
D) The Differentiated Services field value in the IP packet header.

Solutions: