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

1. A provider plans to use IP SLA to help diagnose future performance issues in their PE routers in the network. Which two should be considered by the provider? (Choose two.)

A) IP SLA is supported only on Cisco IOS edge routers, because it simulates traffic from the network endpoints.
B) IP SLA requires a significant amount of resources to operate properly. Using IP SLA on the PE routers will only aggravate performance-related issues the network already encounters.
C) IP SLA should be implemented on dedicated hardware to properly simulate network endpoints.
D) IP SLA should use a mix of source and target points.

2. 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 P
B) CE interface toward PE
C) PE interface toward CE
D) P interface toward PE

3. What problem could occur when applying this policy map on CE?
policy-map CE-SP-MODEL class VOIP priority class BROADCAST-VIDEO priority class SP-CRITICAL-DATA bandwidth percent 40 random-detect exp 3 15000 packets 45000 packets class class-default random-detect exp 1 2500 packets 7500 packets random-detect exp 0 1500 packets 10500 packets

A) No bandwidth or policing is configured for voice and video traffic, and other traffic could be impacted.
B) Default class does not have bandwidth assigned.
C) Only one priority queue is allowed per policy.
D) All traffic is classified and treated properly, no issues occur.

4. Refer to the exhibit.

A provider uses the recommended mappings for DSCP to MPLS EXP. Several sites connected to the same PE router report that critical data has been experiencing a high number of drops. The customer marks its CRITICAL data as AF31. What appears to be the problem?

A) The allocated bandwidth for CRITICAL-DATA should be increased to provide sufficient bandwidth to support the application.
B) The provider is using the recommended mappings for DSCP to MPLS EXP, so the CLASS-MAP for the CRITICAL-DATA should contain EXP value of 4.
C) The recommended mapping for AF31 is to MPLS EXP 5, which is classified in the REALTIME class, not the CRITICAL DATA class.
D) If the data receiving drops is high priority, it should be marked with MPLS EXP value 7.
E) The classification for CRITICAL-DATA should contain a match-all, not a match-any.

5. Refer to the exhibit.

Some customers report that at peak times during the day their average throughput seems to be less than what they expect. While troubleshooting, you notice that data flows sometimes seem to be synchronized with a tendency to increase then drop off in a repeating manner. Which action would help to alleviate this situation?

A) Implement WRED to help prevent tail drops during periods of congestion.
B) Change your QoS model from DiffServ to IntServ for better QoS scalability.
C) Decrease the size of output queues in the network to allow the scheduler to allocate link bandwidth fairly.
D) Implement traffic shaping to smooth out the peaks and troughs.

Solutions: