Cisco 642-785

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

2. Refer to the exhibit.

Which two statements are correct? (Choose two.)

A) This example queues the traffic into different CBWFQ classes before the aggregate traffic is shaped.
B) The policy map cust-policy specifies an average traffic shaping rate of 384 kb/s for the cust1 class and assigns the service policy cust1-classes to the cust1 class.
C) The traffic class cust2 is ensured a bandwidth of 51.2 kb/s.
D) Within the cust2-classes policy, the gold class is guaranteed 30 percent of the S3/2 interface bandwidth. Silver is guaranteed 15 percent of the S3/2 interface bandwidth. Bronze is guaranteed 10 percent of the S3/2 interface bandwidth.
E) This example is a hierarchical MQC example, and the cust-policy is the child policy.
F) Within the cust1-classes policy, the gold class is guaranteed 50 percent of the bandwidth. Silver is guaranteed 20 percent of the bandwidth, and bronze is guaranteed 15 percent of the bandwidth.

3. Refer to the exhibit.

Which statement is correct?

A) This policy will police traffic at the ingress and egress directions.
B) This is a dual-rate policing example.
C) Packets marked with IP Precedence 5 that exceeds the committed rate will be marked with MPLS EXP 5.
D) Packets marked with IP Precedence 5 that conforms to the committed rate will be marked with MPLS EXP 5 then transmitted.

4. Refer to the exhibit.

The QoS profile was recently updated to mark VoIP traffic with a DSCP setting of AF41. However, the traffic going to the phones in the 172.19.5.0/24 address space is not being marked properly. What is causing this problem?

A) Class typeA markings appear first in the policy map, which causes this marking to be applied.
B) The traffic policy is not written correctly, which causes the wrong marking to be applied.
C) The access list does not properly identify SIP traffic.
D) The VoIP classification should be configured before any other classifications, because it is the highest priority.

5. A service provider recently changed from RFC 3270 Uniform mode to Pipe mode. Which three considerations about this change are true? (Choose three.)

A) The Pipe mode provides the isolation between the customer and provider DiffServ domains, while maintaining a simpler support model.
B) If the provider moved to a Short Pipe mode model, it would allow them to implement customer-specific QoS policy on the PE egress.
C) In Uniform mode, when the topmost EXP value is changed, the changed EXP value will propagate to the original IP precedence or DSCP.
D) The Short Pipe mode derives the outbound classification of the WRED and WFQ based on the DiffServ policy of the provider.

Solutions: