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

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

2. Which four factors can be used for packet classification in a QoS-aware network device? (Choose four.)

A) MQC
B) TTL
C) destination address
D) DSCP
E) IP precedence
F) source address

3. DRAG DROP
Drag the definitions from the left onto the traffic classification on the right. Not all definitions will be used.

4. Refer to the exhibit.

A customer reports that data between their sites across your network is very slow and that
voice and video quality are unacceptable. Packet traces of data coming in from and going out to the customer confirm that many packets are being dropped in your network, and many of those that are not dropped are being remarked to CS1. Class maps and a policy map configured as shown are applied inbound to the Fast Ethernet interfaces that connect the customer. What could be the problem?

A) The match criteria is DSCP and the customer packets are being sent marked using IP precedence.
B) The customer data is being rate limited, but is not being queued by class, which is causing tail drops and packet remarking.
C) The CIR and PIR values appear to have been configured using kbps when the entries are bps.
D) All traffic is matching the class class-default, because all other classes are match-all with multiple match criteria.

5. Within a QoS policy-map configuration, one of the traffic classes is configured with the random-detect dscp-based configuration command. What will that command accomplish?

A) decreases congestion by avoiding global UDP synchronization
B) provides congestion avoidance by selectively delaying the delivery of packets with lower DSCP priority
C) provides congestion management by queueing the traffic using LLQ
D) provides congestion management by queueing the traffic using CBWFQ
E) decreases the probability of congestion by selectively dropping TCP packets before the queue is full

Solutions: