Cisco CCNP SP Operations 642-785

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

1. Refer to the exhibit.

Which statement is correct?

A) This example is a traffic policer, and traffic exceeding the committed rate will be buffered until the congestion is cleared.
B) This example is a percentage-based policer, and the configured percentage is referenced to the input or output queue size.
C) This example is a traffic policer, and three token buckets are used to meter the incoming traffic.
D) This example is a dual-rate policer, and traffic exceeding either the peak or the committed rate will be dropped.
E) This example is a dual-bucket policer, and only traffic that exceeds the committed rate will be dropped.

2. A customer with an unmanaged CE router has reported experiencing poor quality on the video conferencing and broadcast multimedia applications. To address the issue, the provider has implemented shaping on the PE router to "smooth out" speed mismatches in the network. Which of these is a valid concern with this approach?

A) While shaping may help the broadcast multimedia application, it could cause additional delay in the video conferencing application.
B) Shaping should only be used in a TCP-based environment where the application can detect the congestion and adjust. Shaping provides little benefit with UDP applications.
C) In addition to shaping, the provider should implement policing so the application can detect the congestion and throttle traffic.
D) Shaping can only be applied to the outbound interface, which does not prevent the customer from flooding the inbound link to the provider.

3. Refer to the exhibit.

A customer has commented that voice quality is not meeting expectations when calls cross your network. This voice packet was captured from the egress link to the customer. This capture is representative of the customer's voice packets across your network and the queuing method shown is representative of packet treatment across your network. How might the problem be corrected?

A) Enable WRED in the CBWFQs to minimize the possibility of dropping voice packets.
B) Increase the bandwidth for the voice class.
C) Ensure that voice packets are correctly marked when they traverse your network.
D) Set up multiple priority queues to ensure low latency for voice packets.

4. Which statement about when you mix TCP and UDP traffic in the same class and overflow occurs is true?

A) UDP traffic suffers more, because TCP guarantees delivery.
B) Mixing TCP and UDP in the same class is not supported.
C) The overflow is not a problem, because both TCP and UDP packets get randomly dropped and traffic will back out.
D) TCP traffic is starved, because UDP never slows down when packets get dropped.

5. Which three items are important when monitoring service quality in the SP network? (Choose three.)

A) QoS issues can be difficult to detect when there is not enough traffic to trigger the configured QoS policy.
B) Collection of data to detect QoS issues is slow and labor-intensive.
C) Establishing alarm thresholds for QoS problems can be complicated.
D) Troubleshooting class map configurations is complex and frequently required.
E) QoS support differs from device to device, depending on underlying hardware platforms and software.
F) The typical cause of QoS issues is intermittent failure of network devices and these are inherently difficult to detect.

Solutions:

Question # 1 Answer: D

Question # 2 Answer: A

Question # 3 Answer: C

Question # 4 Answer: D

Question # 5 Answer: A,C,E