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

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

2. What are the benefits of using differentiated services in the service provider backbone? (Choose two.)

A) less bandwidth required to achieve the same SLA
B) more aggregate traffic supported
C) overprovision by two times the maximum aggregate
D) simple, easy to design, deploy, and operate

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

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

4. Which statement about the MQC configuration shown here for the class-default traffic class is true?
policy-map CE-EDGE-4CLASS-OC3-POS-1
class class-default
bandwidth percent 25
!

A) This configuration is invalid, because the class-default traffic class does not support the bandwidth command.
B) The bandwidth percent is referenced to the reserved bandwidth on the interface.
C) The class-default class will use WFQ instead of FIFO queueing.
D) The maximum number of packets the queue for the class-default class can hold is 64 packets using the default queue-limit.

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

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

Solutions: