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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

Which three characteristics are drawbacks to the use of a best-effort with over-provisioning backbone design? (Choose three.)

A. It requires complex QoS mechanisms at the network edge.
B. Denial of Service attacks on one service can affect all network traffic.
C. The design costs more to implement than a DiffServ backbone.
D. It requires complex QoS mechanisms at the network core.
E. The design uses a different over-provisioning ratio for the different traffic classes.
F. Unplanned network failures can cause unexpected congestion in the network.

Question 2

DRAG DROP
Drop

Question 3

What are two benefits of WFQ? (Choose two.)

A. WFQ can provide fixed-bandwidth and fixed-delay guarantees.
B. Based on DSCP, WFQ allows weighted, random dropping of packets when the WFQ system is full.
C. WFQ can provide fixed-bandwidth guarantees.
D. WFQ is very easy to configure, and no manual traffic classification is necessary.
E. WFQ prevents the large-volume flows with large packet size from starving out the low-volume flows with small packet size.
F. WFQ can provide fixed-delay guarantees.

Question 4

Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)

A. random-detect dscp-based
B. compress header ip rtp
C. shape peak {bps}
D. priority {kbps}
E. bandwidth {kbps}
F. random-detect ecn

Question 5

Traffic classification using NBAR is configured using which IOS command?

A. router(config-cmap)# match protocol {protocol-name}
B. router(config-if)# ip nbar protocol-discovery
C. router(config)# ip nbar port-map {protocol} [tcp|udp] {port-number} {port-number} ....
D. router(config)# ip nbar pdlm {pdlm-file}

Solutions: