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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

Which mechanism is used for the prioritizing, protection, and isolation of traffic based on marking?

A. congestion avoidance
B. metering
C. congestion management
D. policing
E. classification and marking
F. shaping

Question 2

Refer to the exhibit. According to the show output, which statement is true?

A. The unknown protocol traffic statistics refer to all the traffic matched by the class-default traffic class.
B. HTTP is the most active protocol on the Fa0/0 interface based on byte count.
C. NBAR protocol discovery has been enabled on the router through the use of the match protocol commands within the class-map.
D. There is a total of 39,990 NetBIOS packets exiting the Fa0/0 interface.
E. The 5-minute average bits-per-second rate for all traffic entering the Fa0/0 interface is 398 kbps.

Question 3

Where is the fragment size configured when using FRF.12 link fragmentation and interleaving?

A. within the Frame Relay map-class
B. within the MQC class-map
C. within the logical multilink interface
D. within the physical serial interface
E. within the MQC service-policy
F. within the MQC policy-map

Question 4

According to the best practices, in a service provider network, which statement is true as related to the QoS policy that should be implemented on the inbound provider (P) to provider (P) router link?

A. Traffic policing should be implemented to rate-limit the ingress traffic into the P router.
B. Because traffic should have already been policed and marked on the upstream ingress PE router, no input QoS policy is needed on the P to P link.
C. In the DiffServ model, all ingress and egress QoS processing are done at the network edge (for example, PE router), so no input or output QoS policy will be needed on the P to P link.
D. Class-based marking should be implemented because it will be needed for the class-based queuing that will be used on the P router output.

Question 5

The qos pre-classify command can be configured under which two configuration modes? (Choose two.)

A. router(config-router)#
B. router(config-crypto-map)#
C. router(config-pmap-c)#
D. router(config)#
E. router(config-cmap)#
F. router(config-if)#

Solutions: