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Cisco 642-642 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Implementing Cisco Quality of Service (QoS) |
| Exam Number: | 642-642 |
| Exam Format: | Drag-and-Drop, Multiple Choice, Simulation |
| Real Exam Qty: | 45-87 |
| Passing Score: | Approx 700-790 / 1000 |
| Exam Price: | Approx $150-$200 USD |
| Certificate Validity Period: | 3 years |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Related Certifications: | Cisco IP Telephony Design Specialist Cisco IP Telephony Operations Specialist Cisco IP Telephony Support Specialist Cisco IP Telephony Express Specialist |
| Recommended Training: | Implementing Cisco QoS v2.1 |
| Exam Registration: | Pearson VUE (Historical) |
| Sample Questions: | Cisco 642-642 Sample Questions |
| Exam Way: | Proctored at Pearson VUE test centers; Retired since October 29, 2012 |
| Pre Condition: | Valid CCNA certification or equivalent knowledge |
| Official Syllabus URL: | https://www.cisco.com |
Cisco 642-642 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Modular QoS CLI (MQC) and AutoQoS | 15% | - AutoQoS for Enterprise and VoIP - Class-maps, Policy-maps, Service-policy |
| Topic 2: Traffic Policing and Shaping | 15% | - Policers: single-rate, two-rate - Shaping: GTS, FRTS, CB-Shaping |
| Topic 3: Congestion Avoidance & Link Efficiency | 10% | - Fragmentation, Compression, LFI - WRED, RED |
| Topic 4: IP QoS Fundamentals and Models | 20% | - Need for QoS in converged networks - QoS models: Best-Effort, IntServ, DiffServ - DSCP, IP Precedence, CoS, MPLS EXP marking |
| Topic 5: Congestion Management | 20% | - Priority queuing and bandwidth allocation - Queuing algorithms: WFQ, CBWFQ, LLQ |
| Topic 6: Classification and Marking | 20% | - Marking mechanisms and trust boundaries - NBAR, ACL-based classification - Layer 2 and Layer 3 classification |
Cisco Quality of Service (QoS) Sample Questions:
In which two locations is the qos pre-classify command applied to support QoS preclassification over an IPSec/GRE tunnel? (Choose two.)
- A. the policy-map
- B. the tunnel interface
- C. the physical interface
- D. the crypto map
- E. the class-map
Correct Answer: B,D 🗳️
Explanation: Only visible for BraindumpQuiz members. You can sign-up / login (it's free).
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. CBWFQ and CB-RTP header compression should be implemented on the P router egress to ensure minimum latency for VoIP traffic.
- B. CBWFQ and CB-WRED should be implemented on the P router egress to provide a maximum bandwidth guarantee for the VoIP traffic.
- C. 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.
- D. LLQ and CB-WRED should be implemented on the P router egress to support both VoIP and data traffic.
Correct Answer: D 🗳️
Explanation: Only visible for BraindumpQuiz members. You can sign-up / login (it's free).
Which algorithm (discard method) does WRED use to determine which packets will be dropped when the average queue length becomes larger than the user-specified maximum threshold?
- A. packet size based discard
- B. weighted early discard
- C. tail discard
- D. random discard
Correct Answer: C 🗳️
Explanation: Only visible for BraindumpQuiz members. You can sign-up / login (it's free).
Traffic classification using NBAR is configured using which IOS command?
- A. router(config)# ip nbar pdlm {pdlm-file}
- B. router(config-cmap)# match protocol {protocol-name}
- C. router(config)# ip nbar port-map {protocol} [tcp|udp] {port-number} {port-number} ....
- D. router(config-if)# ip nbar protocol-discovery
Correct Answer: B 🗳️
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