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Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Classification and Marking | - Network-based application recognition and classification - Layer 2 and Layer 3 marking - Modular QoS CLI classification and marking |
| Introduction to Quality of Service | - QoS concepts and requirements - Traffic classification and marking concepts - QoS models and architectures |
| QoS Management and Implementation | - QoS monitoring and troubleshooting - QoS deployment considerations - QoS policy configuration and verification |
| Congestion Management | - Queuing mechanisms - Low Latency Queuing - Class-Based Weighted Fair Queuing |
| Congestion Avoidance | - Random Early Detection - Weighted Random Early Detection |
| QoS for Voice and Video Applications | - End-to-end QoS deployment - IP telephony QoS design considerations - Voice traffic requirements |
| Link Efficiency Mechanisms | - Compression technologies - Link fragmentation and interleaving |
Cisco Quality of Service (QoS) Sample Questions:
The following commands have been configured under the fa0/1 interface on the 2950 switch:
wrr-queue bandwidth 20 1 80 0
mls qos trust cos
mls qos trust device cisco-phone
Voice traffic from the IP phone that is directly connected to the fa0/1 interface is experiencing excessive delays. What could be the cause of this problem?
- A. The default dscp-to-cos map is being used.
- B. The default wrr-queue cos-map is being used.
- C. The default cos-to-dscp map is being used.
- D. The trust boundary configuration is not correct.
- E. The wrr-queue bandwidth weightings are not correct.
Correct Answer: B 🗳️
Explanation: Only visible for PrepAway members. You can sign-up / login (it's free).
Refer to the exhibit. A service provider is considering several alternative provisioning schemes for a new network. One proposed scheme involves aggregating 10-Mbps links from customers into a network with multiple 100-Mbps links to ensure that the network links have at least two times the capacity of the aggregate of the customer links.
What is the most appropriate description for the proposed scheme?
- A. oversubscription
- B. Bandwidth-on-Demand
- C. overprovisioning
- D. CIR of 0
- E. overaggregate
Correct Answer: C 🗳️
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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. LLQ, CB-WRED, CB-Policing, and CB-TCP and CB-RTP header compressions
- B. CBWFQ, CB-WRED, CB-Marking, CB-Policing, and FRTS
- C. CBWFQ, FRTS, FRF.12, and CB-RTP header compression
- D. WRR, FRTS, FRF.12, and CB-RTP header compression
- E. LLQ, CB-WRED, CB-Marking, FRTS, FRF.12, and CB-RTP header compression
- F. WRR, CB-WRED, CB-Marking, FRF.12, and CB-RTP header compression
Correct Answer: E 🗳️
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What are two errors in this policy-map configuration? (Choose two.)
policy-map test
class voice
priority 64
class bulk
bandwidth percent 20
fair-queue
class interactive
bandwidth percent remaining 10
fair-queue
class class-default
fair-queue
- A. The bandwidth units for the bulk and interactive traffic classes are inconsistent.
- B. The voice traffic class should have the no fair-queue command.
- C. WFQ cannot be configured for the class-default traffic class.
- D. The priority command cannot be used with the bandwidth command within the same policy-map.
- E. The bandwidth command is missing for the class-default traffic class.
- F. WFQ cannot be configured for the bulk and interactive traffic classes.
Correct Answer: A,F 🗳️
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