642-785 試験問題を無料オンラインアクセス

To classify and prioritize traffic according to importance, which three statements are correct? (Choose three.)

• A.Video should be placed in the same class as voice.
• B.Voice traffic should be given top priority.
• C.Critical applications should be given sufficient bandwidth to meet their requirements.
• D.Email should be placed in a best-effort class.
• E.Each class should be guaranteed at least some bandwidth.

Which four factors can be used for packet classification in a QoS-aware network device? (Choose four.)

• A.IP precedence
• B.source address
• C.MQC
• D.TTL
• E.destination address
• F.DSCP

Which is the preferred queuing method provided by Cisco IOS Software for a converged VoIP network?

• A.LLQ
• B.FIFO
• C.CBWFQ
• D.WFQ

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

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

An MPLS VPN customer with managed CE services recently made some changes to their call manager configurations. Now the customer reports that their VoIP traffic voice quality is very poor. What could be a cause of the problem?

• A.RTP header compression is used for the VoIP traffic class.
• B.The VoIP traffic class is not being policed at the CE router egress.
• C.The VoIP traffic is being marked as DSCP EF.
• D.The customer changed the codec used for voice compression from G.729 to G.711.
• E.The traffic shaping rate for the VoIP traffic class is too low.