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Cisco 642-785 Exam Syllabus Topics:

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

1. A customer is experiencing poor quality on voice connections coming from a particular branch office. Data on the service provider network capacity indicates that the devices serving that location are heavily oversubscribed. It will be months before planned expansions can be implemented. Which class-based traffic-shaping technique would be appropriate to consider implementing?

A) shaping to the peak rate
B) shaping to the observed median rate
C) shaping to the configured average rate
D) shaping to the committed rate

2. Which two statements about IP SLA are correct? (Choose two.)

A) IOS IP SLA uses active traffic monitoring which allows users to analyze service levels for IP applications.
B) Cisco IOS IP SLA can be used to help detail billing information for each defined class of service.
C) IP SLA uses NBAR to provide the reporting engine for statistics that it collects.
D) Cisco IOS IP SLA is Layer 2 transport independent.
E) IOS IP SLA is a traffic monitoring mechanism that gathers statistics about traffic based on packet headers and fields.

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

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

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

5. An MPLS VPN customer with managed CE services recently made some changes to their call manager configurations. Now the customer reports that their VoIP traffic voice quality is very poor. What could be a cause of the problem?

A) The traffic shaping rate for the VoIP traffic class is too low.
B) RTP header compression is used for the VoIP traffic class.
C) The VoIP traffic class is not being policed at the CE router egress.
D) The VoIP traffic is being marked as DSCP EF.
E) The customer changed the codec used for voice compression from G.729 to G.711.

Solutions: