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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

Question 1

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

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

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

Question 3

Traffic classification using NBAR is configured using which IOS command?

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

Question 4

HOTSPOT

Question 5

In a managed CE scenario, the customer's network is supporting VoIP and bulk file transfers. According to the best practices, which QoS mechanisms should be applied on the WAN edge CEPE 56-kbps Frame Relay link on the CE outbound direction?

A. CBWFQ, CB-WRED, CB-Marking, CB-Policing, and FRTS
B. LLQ, CB-WRED, CB-Marking, FRTS, FRF.12, and CB-RTP header compression
C. WRR, CB-WRED, CB-Marking, FRF.12, and CB-RTP header compression
D. CBWFQ, FRTS, FRF.12, and CB-RTP header compression
E. WRR, FRTS, FRF.12, and CB-RTP header compression
F. LLQ, CB-WRED, CB-Policing, and CB-TCP and CB-RTP header compressions

Solutions: