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Cisco 642-642 : Quality of Service (QoS)
- Exam Code: 642-642
- Exam Name: Quality of Service (QoS)
- Updated: Oct 07, 2026
- Q & A: 87 Questions and Answers
Three versions, one question bank. The Cisco Quality of Service (QoS) materials at VCETorrent come as PDF, software, and online test versions to suit different study demands — and whichever you choose, the 642-642 exam product reaches your mailbox in about a minute after payment.
Cisco 642-642 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Classification and Marking | 20% | - Marking mechanisms and trust boundaries - NBAR, ACL-based classification - Layer 2 and Layer 3 classification |
| Congestion Avoidance & Link Efficiency | 10% | - WRED, RED - Fragmentation, Compression, LFI |
| Traffic Policing and Shaping | 15% | - Shaping: GTS, FRTS, CB-Shaping - Policers: single-rate, two-rate |
| Modular QoS CLI (MQC) and AutoQoS | 15% | - Class-maps, Policy-maps, Service-policy - AutoQoS for Enterprise and VoIP |
| IP QoS Fundamentals and Models | 20% | - QoS models: Best-Effort, IntServ, DiffServ - DSCP, IP Precedence, CoS, MPLS EXP marking - Need for QoS in converged networks |
| Congestion Management | 20% | - Priority queuing and bandwidth allocation - Queuing algorithms: WFQ, CBWFQ, LLQ |
642-642 Exam FAQ: Preparation, Payment, and Facts
Cisco recommends these training resources for candidates:
An effective training course builds understanding; scored practice with expert-verified answers builds exam readiness. The two work best together.
Yes. VCETorrent processes every purchase through a secure Credit Card payment system, so your transaction is protected from leakage or error at each step of the deal. We put customers' interests and the quality of the Cisco Quality of Service (QoS) product first — the 642-642 exam materials should be the only thing you need to think about after checkout.
The 642-642 exam contains 45-87 questions with 90 minutes minutes to complete them. Scored practice rounds under the same limit are how you find out — in advance — whether the clock will be a problem for you.
The official outline divides the 642-642 exam into weighted domains, including:
- IP QoS Fundamentals and Models (20%)
- Congestion Management (20%)
- Congestion Avoidance & Link Efficiency (10%)
The Cisco Quality of Service (QoS) practice questions at VCETorrent are organized around these same objectives, so your scored mock results map directly onto the areas that need work.
The 642-642 exam leads to the Cisco Quality of Service (QoS) certification from Cisco, one of the more popular credentials among IT professionals — and it is genuinely not easy to pass. The workable approaches are well known: invest focused time and energy, take an effective training course, and practice with material that mirrors the real exam. Preparation quality, not luck, separates the attempts that succeed from the ones that need repeating.
Registration for the 642-642 exam runs through these official channels:
A good moment to register is when your scored practice results stay consistently strong — let measurement, not mood, set the date.
That is exactly what the software version is for. It recreates the atmosphere of the real 642-642 exam, and after each exercise you can assess your score and see your current level in concrete terms. Those results tell you whether you are grasping the key points or still circling them, so your remaining study time goes in the right direction — particularly valuable when work and family leave you only a few hours a week.
Valid CCNA certification or equivalent knowledge
Passing the 642-642 exam requires Approx 700-790 / 1000, and registration costs Approx $150-$200 USD. Think of preparation as the smaller investment that protects the larger one — measured, scored practice is how you make that trade a good one.
Cisco Quality of Service (QoS) Sample Questions:
Question #1
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. weighted early discard
- B. random discard
- C. packet size based discard
- D. tail discard
Correct Answer: D 🗳️
Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).
Question #2
Question #3
According to the best practices, in a service provider network, which statement is true as related to the QoS policy that should be implemented on the inbound provider (P) to provider (P) router link?
- A. In the DiffServ model, all ingress and egress QoS processing are done at the network edge (for example, PE router), so no input or output QoS policy will be needed on the P to P link.
- B. Traffic policing should be implemented to rate-limit the ingress traffic into the P router.
- C. Class-based marking should be implemented because it will be needed for the class-based queuing that will be used on the P router output.
- D. Because traffic should have already been policed and marked on the upstream ingress PE router, no input QoS policy is needed on the P to P link.
Correct Answer: D 🗳️
Question #4
Which three characteristics best describe a converged network? (Choose three.)
- A. the use of overprovisioning to ensure voice quality
- B. the use of a separate high-speed link for bulk traffic to avoid interference with other traffic
- C. the separation of the voice and data networks into two networks to ensure voice quality
- D. the random dropping of lower priority traffic to ensure that high-priority traffic gets through
- E. prioritization and congestion management to ensure voice quality
- F. the potential for poor voice quality due to other traffic
Correct Answer: D,E,F 🗳️
Question #5
In an unmanaged CE router implementation, how does the service provider enforce the SLA?
- A. by marking on the CE to PE link and using class-based policing on the PE to P link
- B. by marking on the CE to PE link and using CBWFQ and CB-WRED on the PE to P link
- C. by using class-based random discard on the CE to PE link to limit the customer's input rate
- D. by using class-based policing on the CE to PE link to limit the customer's input rate
Correct Answer: D 🗳️
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