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Updated: Aug 02, 2026
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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 Duration: | 90 minutes |
| Passing Score: | Approx. 790 / 1000 |
| Certificate Validity Period: | Retired (no longer available) |
| Real Exam Qty: | 45-55 |
| Related Certifications: | Cisco Certified Network Professional (CCNP) |
| Exam Price: | USD 200-300 (varies by region) |
| Available Languages: | English |
| Exam Format: | Multiple Choice, Multiple Answer, Simulation, Drag and Drop |
| Sample Questions: | Cisco 642-642 Sample Questions |
| Exam Way: | Computer-based exam (Pearson VUE test center or online proctored, depending on availability) |
| Pre Condition: | Recommended Cisco CCNA-level networking knowledge or equivalent experience |
| Official Syllabus URL: | https://www.cisco.com |
Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Congestion Avoidance | - Random Early Detection (RED, WRED) |
| Topic 2: Traffic Policing and Shaping | - Traffic shaping techniques and use cases - Policing mechanisms and configuration concepts |
| Topic 3: QoS Implementation on Cisco Devices | - Modular QoS CLI (MQC) configuration - End-to-end QoS deployment considerations |
| Topic 4: Classification and Marking | - Packet marking (DSCP, CoS, IP Precedence) - Traffic classification methods |
| Topic 5: Congestion Management | - Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ) |
| Topic 6: QoS Fundamentals | - Introduction to Quality of Service concepts - QoS models and architectures (Best Effort, IntServ, DiffServ) |
| Topic 7: Link Efficiency Mechanisms | - Fragmentation and interleaving (LFI, MLP QoS concepts) |
Cisco Quality of Service (QoS) Sample Questions:
1. What describes the use of best-effort service with overprovisioning?
A) ensuring quality of service by being able to load balance across links in times of congestion
B) ensuring constant availability by provisioning multiple paths through the network
C) ensuring availability and quality of service by always provisioning key services across at least two service provider networks
D) ensuring quality of service by deploying sophisticated prioritization and congestion management mechanisms
E) ensuring quality of service by providing more than the aggregate bandwidth required
2. DRAG DROP
3. SIMULATION - LAB
A) Please click console
4. What will be the peak shape rate based on the configuration that follows?
policy-map setpeak
class all-traffic
shape peak 32000
A) 32000 bps
B) 64000 bps
C) 16000 bps
D) 96000 bps
E) 80000 bps
F) 48000 bps
5. Which command is typically applied to the voice traffic class within a policy-map?
A) random-detect dscp-based
B) fair-queue
C) compress header ip rtp
D) shape average {bps}
E) bandwidth {kbps}
F) shape peak {bps}
Solutions:
| Question # 1 Answer: E | Question # 2 Answer: Only visible for members | Question # 3 Answer: A | Question # 4 Answer: B | Question # 5 Answer: A,C |
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