Cisco Quality of Service (QoS) : 642-642

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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question #1

DRAG DROP
Drop

Question #2

Based on the following Cisco Catalyst 2950 Series switch configurations, which additional command will enable these actions?
Traffic marked with a CoS of 6 or 7 will be serviced by the priority queue.
Traffic marked with a CoS of 0, 1, or 2 will have a 20-percent weight when serviced by the wrr queue.
Traffic marked with a CoS of 4 will have a 30-percent weight when serviced by the wrr queue.
Traffic marked with a CoS of 3 or 5 will have a 50-percent weight when serviced by the wrr queue.
Catalyst 2950 partial configuration:
no wrr-queue cos-map
wrr-queue cos-map 1 0 1 2
wrr-queue cos-map 2 4
wrr-queue cos-map 3 3 5
wrr-queue cos-map 4 6 7

A. wrr-queue bandwidth 1 10 15 25
B. wrr-queue bandwidth 1 20 30 50
C. wrr-queue bandwidth 15 25 10 1
D. wrr-queue bandwidth 10 15 25 0
E. wrr-queue bandwidth 15 25 10 0

Question #3

Which four of the following bit values are used for bits 5-7 of the DSCP field to select AF PHB? (Choose four.)

A. 010
B. 101
C. 001
D. 100
E. 000
F. 011

Question #4

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

A. In the DiffServ model, ingress and egress QoS mechanisms are only required on the provider edge (PE) routers, so no QoS policy is needed on the P to P link.
B. CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic.
C. LLQ and CB-WRED should be implemented on the P router egress to support both VoIP and data traffic.
D. CBWFQ and CB-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic.

Question #5

Which two values influence how the fragment size should be set when configuring FRF.12? (Choose two.)

A. the Voice over IP (VoIP) packet size
B. the software queuing method
C. the physical interface port speed
D. the CIR of the PVC
E. the dual FIFO Frame Relay interface queue size

Solutions: