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Cisco 642-785 Exam Overview:

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

Question 1

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

Question 2

Refer to the exhibit.

You have implemented RFC 3270 Uniform mode in your MPLS network. A customer packet with the DSCP value of AF31 has been sent to the ingress PE router. The PE router has mapped the DSCP values into the MPLS experimental bits, but the policer has remarked the experimental bits of the top label. What will the DSCP value of the packet be when it leaves the egress PE router?

A. CS1
B. BE
C. CS3
D. AF31

Question 3

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 employs a weighted method for determining which packets to drop to avoid congestion. Packets with a higher precedence are less likely to be dropped.
C. WRED should always be used in traffic classes that support a MIX of realtime UDP and TCP traffic.
D. WRED is a congestion avoidance technique.
E. Using WRED will necessitate a large number of dropped packets.

Question 4

A service provider will apply this policy at which of these interfaces?
interface Gi1/1 service-policy output SP-POLICY ! policy-map SP-POLICY class TRAFFIC-CLASS-1 police rate percent 20 conform-action transmit exceed-action drop priority ! class TRAFFIC-CLASS-2 bandwidth percent 50 queue-limit 800 ms random-detect exp 3 280 ms 490 ms ! class class-default queue-limit 500 ms random-detect exp 1 200 ms 350 ms random-detect exp 0 100 ms 200 ms ! end-policy-map ! class-map match-any TRAFFIC-CLASS-1 match dscp ipv4 45 ef cs6 match mpls experimental topmost 5 6 end-class-map ! class-map match-any TRAFFIC-CLASS-2 match dscp ipv4 cs2 af21 af23 af31 af32 af33 35 37 match mpls experimental topmost 3 end-class-map !

A. PE interface toward CE
B. P interface toward PE
C. CE interface toward PE
D. PE interface toward P

Question 5

A MPLS VPN customer reports poor VoIP call quality across the MPLS VPN. What could be the problem?

A. The service provider has assigned more than 33% of the interface bandwidth to the priority class.
B. The service provider is using RTP header compression on the high-speed core links.
C. The total end-to-end delay measured is constantly over 350 msec.
D. All the core links in the service provider network are using LLQ.
E. The service provider is using the Short Pipe mode rather than the Uniform mode.

Solutions: