Cisco 642-785

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

1. Where would a service provider apply this policy?
interface Gi1/1 service-policy output SP-POLICY
policy-map SP-POLICY class CLASS-REALTIME priority set cos 5 ! class CLASS-HIPRIORITY bandwidth remaining percent 75 set cos 3 ! class CLASS-BASIC bandwidth remaining percent 20 set cos 1 !
class class-default set cos 1 ! end-policy-map
class-map match-any CLASS-BASIC match dscp af11 af12 af13 end-class-map ! class-map match-any CLASS-REALTIME match dscp ef af42 af43 end-class-map ! class-map match-any CLASS-HIPRIORITY match dscp af21 af22 end-class-map !

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

2. Which three components would you use to define and apply traffic classification? (Choose three.)

A) policy map
B) route policy
C) class map
D) service policy
E) route map

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

4. A customer reports that the packets from their custom TCP application, which is currently marked as DSCP AF43, is being dropped more frequently than desired. All of the links in service provider network are using DSCP-based WRED. What can be changed to best improve the drop rate of the customer's custom application without causing major problems for the other traffic classes?

A) Remove WRED on all the links.
B) Mark the custom application traffic to DSCP EF instead.
C) Allocate more bandwidth to the AF43 traffic class.
D) Mark the custom application traffic to DSCP AF41 instead.
E) Use a different queuing method for the AF43 traffic class.

5. A service provider recently changed from RFC 3270 Uniform mode to Pipe mode. Which three considerations about this change are true? (Choose three.)

A) The Pipe mode provides the isolation between the customer and provider DiffServ domains, while maintaining a simpler support model.
B) The Short Pipe mode derives the outbound classification of the WRED and WFQ based on the DiffServ policy of the provider.
C) In Uniform mode, when the topmost EXP value is changed, the changed EXP value will propagate to the original IP precedence or DSCP.
D) If the provider moved to a Short Pipe mode model, it would allow them to implement customer-specific QoS policy on the PE egress.

Solutions: