Busy office worker or occupied mother — no limits on time or place. Train with the Cisco Quality of Service (QoS) preparation labs from Test4Cram: 87 practice questions for the 642-642 exam, three versions in 2026.
Cisco 642-642 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Implementing Cisco Quality of Service (QoS) |
| Exam Number: | 642-642 |
| Available Languages: | English |
| Related Certifications: | Cisco Certified Network Professional (CCNP) Cisco Certified Internetwork Professional (CCIP) |
| Exam Price: | USD 250 |
| Exam Format: | Testlet, Multiple Choice, Simulation, Multiple Answer |
| Real Exam Qty: | Approximately 55-65 questions |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | Retired exam |
| Passing Score: | Variable (Cisco does not publish a fixed passing score) |
| Recommended Training: | Cisco QoS Training |
| Exam Registration: | Cisco Certification Exam Registration |
| Sample Questions: |  |
| Exam Way: | Pearson VUE testing centers and authorized Cisco exam delivery locations (legacy exam) |
| Pre Condition: | Recommended knowledge of Cisco routing and switching technologies. No formal prerequisite exam was required for 642-642. |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/qos.html |
Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Congestion Management | - Queuing mechanisms - Class-Based Weighted Fair Queuing - Low Latency Queuing |
| Topic 2: QoS Management and Implementation | - QoS policy configuration and verification - QoS monitoring and troubleshooting - QoS deployment considerations |
| Topic 3: Introduction to Quality of Service | - QoS concepts and requirements - QoS models and architectures - Traffic classification and marking concepts |
| Topic 4: Congestion Avoidance | - Weighted Random Early Detection - Random Early Detection |
| Topic 5: Classification and Marking | - Modular QoS CLI classification and marking - Layer 2 and Layer 3 marking - Network-based application recognition and classification |
| Topic 6: Link Efficiency Mechanisms | - Link fragmentation and interleaving - Compression technologies |
| Topic 7: QoS for Voice and Video Applications | - Voice traffic requirements - IP telephony QoS design considerations - End-to-end QoS deployment |
642-642 Exam FAQ — No Limits
The Cisco Quality of Service (QoS) blueprint spans 7 domains — including QoS Management and Implementation, Introduction to Quality of Service, QoS for Voice and Video Applications. Work the domains in order of weight; the complete outline above lists every subtopic.
Yes — download the free Cisco Quality of Service (QoS) demo and experience the brand-new learning format before paying. Purchases include 365 days of free updates by email; renew afterward at 50% off.
90 minutes for Approximately 55-65 questions questions. The Test4Cram PC dumps' simulated test environment builds the pacing you need — practice without limits on time or place.
Through the vendor's official registration channels:
The Cisco Quality of Service (QoS) is delivered Pearson VUE testing centers and authorized Cisco exam delivery locations (legacy exam) — pick the arrangement that suits you when booking.
The Cisco Quality of Service (QoS) is Cisco's certification exam for Implementing Cisco Quality of Service (QoS), at the Professional level. It's harder than a driver's license test — but brand-new learning ways make it manageable. Related credentials include Cisco Certified Network Professional (CCNP), Cisco Certified Internetwork Professional (CCIP).
Recommended knowledge of Cisco routing and switching technologies. No formal prerequisite exam was required for 642-642. Eligibility rules change over time, so verify the current requirements on the official page (official 642-642 exam page) before registering.
Yes:
After any course, master the important skills with the 87 practice questions for the Cisco Quality of Service (QoS) — every answer expert-verified.
USD 250 per attempt, Variable (Cisco does not publish a fixed passing score) to pass. Retakes cost the full fee, so prepare thoroughly — the 87 practice questions for the 642-642 exam at Test4Cram work as your personal think tank.
Upon successful payment, our system emails the Cisco Quality of Service (QoS) material automatically within about a minute — download the PDF at your convenience right away, with 24/7 help if nothing arrives within 2 hours. If you fail the corresponding 642-642 exam within 60 days of purchase, we return all money: send a scanned enrollment slip plus the official Score Report PDF within 2 days of the exam, processed within 7 days. Excluded: exams within 3 days of purchase, candidate names that don't match the payer, and free or expired products. Prefer a swap? Exchange for two equal-value dumps free. No hassle money.
Cisco Quality of Service (QoS) Sample Questions:
Which command is typically applied to the voice traffic class within a policy-map?
- A. random-detect dscp-based
- B. bandwidth {kbps}
- C. shape average {bps}
- D. compress header ip rtp
- E. shape peak {bps}
- F. fair-queue
Correct Answer: A,D 🗳️
Explanation: Only visible for Test4Cram members. You can sign-up / login (it's free).
Refer to the exhibit. QPPB is being used by the service provider (AS30). The table-map and route-map called "important" are implemented on router POP A.
The command bgp-policy destination ip-prec-map is applied to the interface between POP A in AS30 and NAP (AS40).
Which QoS action would have to be applied on POP B in AS30 to ensure that the traffic from the NAP (AS40) to the customer (AS20) will be marked with an IP precedence of flash?
- A. Traffic from AS20 must have the extended community attribute set to10:50 in a route-map, and send-community extended (or send-community both) must be specified.
- B. Traffic from AS20 must have the community attribute set to10:50 in a route-map, and send-community must be specified.
- C. Traffic from AS20 must be automatically marked via an inbound QoS map on POP B, resulting in the community attribute set to10:50.
- D. No actions are needed. Traffic must be marked in AS20 by the customer as10:50 before it arrives at the service provider.
Correct Answer: B 🗳️
Explanation: Only visible for Test4Cram members. You can sign-up / login (it's free).
SIMULATION - LAB
- A. Please click console
Correct Answer: A 🗳️
R1>en
R1#configure terminal
R1(config)#policy-map llq-policy
R1(config-pmap)#class voice
R1(config-pmap-c)#prority 168
R1(config-pmap-c)#exit
R1(config-pmap)#class interactive
R1(config-pmap-c)#prority 30
R1(config-pmap-c)#exit
R1(config-pmap)#class bulk
R1(config-pmap-c)#prority 16
R1(config-pmap-c)#exit
R1(config-pmap)#class class-default
R1(config-pmap-c)#fair-queue
R1(config-pmap-c)#exit
R1(config-pmap)#exit
R1(config)#int s0/0
R1(config-if)#service-policy output llq-policy
What are three reasons link efficiency mechanisms are deployed on WAN links? (Choose three.)
- A. increase throughput
- B. decrease jitter
- C. decrease propagation delay
- D. increase link speed
- E. decrease delay
Correct Answer: A,B,E 🗳️
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