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

1. 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) CE interface toward PE
C) PE interface toward P
D) P interface toward PE

2. What are the three primary types of faults associated with QoS fault management? (Choose three.)

A) queue faults
B) assurance faults
C) physical faults
D) buffer faults
E) marking faults
F) classification faults

3. An MPLS VPN customer reports that the VoIP voice quality is very bad for calls across the
MPLS VPN. What could be the problem?

A) WRED is not configured for the voice traffic class.
B) The voice traffic class is using the default queue size.
C) Traffic shaping is applied to the voice traffic class.
D) The voice traffic class is using the priority command.
E) The voice packets are marked as DSCP EF.

4. Refer to the exhibit on a PE router. What could be causing the issue?
Service-policy output: OUTPUT-POLICY Counters last updated 00:00:00 ago
Class-map: REALTIME (match-any) 845206 packets, 348763573 bytes 30 second offered rate 3000000 bps, drop rate 2500000 bps Match: ip dscp cs5 (40) ef (46) Priority: 10% (500 kbps), burst bytes 327265678, b/w exceed drops: 312925450
Class-map: DSCP-OUT-RTVI (match-any) 0 packets, 0 bytes 30 second offered rate 0000 bps, drop rate 0000 bps Match: ip dscp af41 (0) Queueing queue limit 32 packets (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0
Class-map: class-default (match-any) 0 packets, 0 bytes 5 minute offered rate 0000 bps, drop rate 0000 bps Match: any Queueing queue limit 1024 packets (queue depth/total drops/no-buffer drops) 0/0/0 (pkts output/bytes output) 0/0

A) CE marked all traffic incorrectly to DSCP 46.
B) PE interface was not configured with enough bandwidth.
C) Traffic rate CE sent is over the SLA limit.
D) PE needs to upgrade to a higher throughput interface.
E) CE marked all traffic incorrectly to DSCP 0.

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

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

Solutions: