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Cisco 642-785 Exam Syllabus Topics:

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

1. When the customer LAN is managed by the service provider and the network is oversubscribed, what is the best location for use of congestion avoidance mechanisms?

A) on output interfaces from the customer LAN leading into the service provider network
B) in interfaces in the service provider network incoming from the customer LAN
C) in the service provider core
D) on output interfaces from the service provider network leading to the customer LAN

2. Which Cisco IOS IP SLA Probe would you select to identify bottlenecks in the network?

A) ICMP Path Echo
B) ICMP Echo
C) ICMP Path Jitter
D) FTP Path Echo

3. Where would you apply WRED to avoid congestion and poor QoS from oversubscription of the network?

A) wherever there is a potential bottleneck and most traffic is UDP
B) wherever there is a potential bottleneck and most traffic is TCP
C) wherever there is a potential bottleneck and most traffic is voice
D) wherever there is a potential bottleneck and traffic is delay-intolerant
E) wherever there is a potential bottleneck

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 customer data is being rate limited, but is not being queued by class, which is causing tail drops and packet remarking.
B) The CIR and PIR values appear to have been configured using kbps when the entries are bps.
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.

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

Solutions: