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Cisco 642-642 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| IP QoS Fundamentals and Models | 20% | - DSCP, IP Precedence, CoS, MPLS EXP marking - Need for QoS in converged networks - QoS models: Best-Effort, IntServ, DiffServ |
| Classification and Marking | 20% | - Layer 2 and Layer 3 classification - Marking mechanisms and trust boundaries - NBAR, ACL-based classification |
| Modular QoS CLI (MQC) and AutoQoS | 15% | - AutoQoS for Enterprise and VoIP - Class-maps, Policy-maps, Service-policy |
| Congestion Management | 20% | - Queuing algorithms: WFQ, CBWFQ, LLQ - Priority queuing and bandwidth allocation |
| Traffic Policing and Shaping | 15% | - Shaping: GTS, FRTS, CB-Shaping - Policers: single-rate, two-rate |
| Congestion Avoidance & Link Efficiency | 10% | - Fragmentation, Compression, LFI - WRED, RED |
Cisco Quality of Service (QoS) Sample Questions:
When configuring a Cisco Catalyst switch to accommodate an IP phone with an attached PC, it is desired that the trust boundary be set between the IP phone and the switch. Which two commands on the switch are recommended to set the trust boundary as described? (Choose two.)
- A. mls qos trust device cisco-phone
- B. no mls qos trust dscp
- C. switchport priority extend trust
- D. mls qos trust cos
- E. mls qos cos 5
- F. mls qos trust extend [cos value]
Correct Answer: A,D 🗳️
Explanation: Only visible for TorrentExam members. You can sign-up / login (it's free).
SIMULATION - LAB
- A. Please click console
Correct Answer: A 🗳️
2950-SWITCH>en
2950-SWITCH#config terminal
2950-SWITCH(config)#int fa0/1
2950-SWITCH(config-if)#mls qos trust dscp
2950-SWITCH(config-if)#exit
2950-SWITCH(config)#int fa0/11
2950-SWITCH(config-if)#mls qos trust cos
2950-SWITCH(config-if)#exit
2950-SWITCH(config)#int fa0/10
2950-SWITCH(config-if)#mls qos trust cos
2950-SWITCH(config-if)#mls qos trust device cisco-phone
2950-SWITCH(config-if)#exit
Based on the Cisco Catalyst 2950 Series switch configuration shown, with no weights being
assigned to the egress queues, which type of queuing is being implemented?
wrr-queue cos-map 1 0
wrr-queue cos-map 2 1 2 3
wrr-queue cos-map 3 4 5
wrr-queue cos-map 4 6 7
- A. weighted round robin
- B. weighted fair
- C. modified deficit round robin
- D. weighted round robin with an expedite queue
- E. priority
- F. custom
Correct Answer: E 🗳️
Explanation: Only visible for TorrentExam members. You can sign-up / login (it's free).
Which two commands are typically applied to the voice traffic class within a policy-map? (Choose two.)
- A. random-detect ecn
- B. random-detect dscp-based
- C. bandwidth {kbps}
- D. priority {kbps}
- E. compress header ip rtp
- F. shape peak {bps}
Correct Answer: D,E 🗳️
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A major media company recently deployed a new converged network. The original network design used separate networks for graphics and video, interactive data, and voice. The company has been experiencing problems with voice traffic in the new converged network. Most of the time voice quality is perfectly acceptable. Periodically voice quality exhibits unacceptable choppy voice signals, and occasionally calls are dropped. At this time the company is not willing to simply add bandwidth to the network.
Which QoS solution would most likely help to resolve the problem?
- A. Use advanced technologies to compress all video and graphics traffic on the network.
- B. Use TCP header compression and LFI to reduce delays.
- C. Use class-based weighted fair queuing to prioritize voice traffic with a higher weight than all other traffic.
- D. Prioritize voice traffic as the highest priority to ensure that voice traffic is always serviced by the priority queue.
Correct Answer: D 🗳️
Explanation: Only visible for TorrentExam members. You can sign-up / login (it's free).
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