642-785 試験問題を無料オンラインアクセス

When the RFC 3270 Pipe mode is used, the PHB at the egress router is based on which of these?

• A.The topmost MPLS label EXP value.
• B.The packet is re-evaluated, remarked, and the PHB is based on this new marking.
• C.The Differentiated Services field value in the IP packet header.
• D.The MPLS VPN label EXP value.

What are two benefits of the DiffServ model? (Choose two.)

• A.It does not require setting up an end-to-end signaling mechanism.
• B.Its class-based mechanisms are simple and scale well.
• C.Service quality can be tailored to the needs of many different types of traffic.
• D.It provides absolute guarantees of service quality.

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

Which two items can be obtained from the CISCO-NETFLOW-MIB? (Choose two.)

• A.CEF tables
• B.signal-to-noise ratio
• C.buffer hits
• D.protocol statistics
• E.cache configuration

Which of these describes Short Pipe mode in QoS for MPLS VPN service providers?

• A.Service provider does not remark customer DSCP values. (Service provider uses independent MPLS EXP markings.) Final PE-to-CE policies are based on service provider markings.
• B.The customer and service provider share the same DiffServ domain.
• C.Service provider can remark customer DSCP values.
• D.Service provider does not remark customer DSCP values. (Service provider uses independent MPLS EXP markings.) Final PE-to-CE policies are based on customer markings.