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Updated: Jul 19, 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 Format: | Multiple Choice, Multiple Answer, Simulation, Drag and Drop |
| Exam Price: | USD 200-300 (varies by region) |
| Passing Score: | Approx. 790 / 1000 |
| Certificate Validity Period: | Retired (no longer available) |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Real Exam Qty: | 45-55 |
| Related Certifications: | Cisco Certified Network Professional (CCNP) |
| 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: Traffic Policing and Shaping | - Policing mechanisms and configuration concepts - Traffic shaping techniques and use cases |
| Topic 2: QoS Implementation on Cisco Devices | - End-to-end QoS deployment considerations - Modular QoS CLI (MQC) configuration |
| Topic 3: Link Efficiency Mechanisms | - Fragmentation and interleaving (LFI, MLP QoS concepts) |
| Topic 4: Congestion Management | - Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ) |
| Topic 5: Congestion Avoidance | - Random Early Detection (RED, WRED) |
| Topic 6: QoS Fundamentals | - QoS models and architectures (Best Effort, IntServ, DiffServ) - Introduction to Quality of Service concepts |
| Topic 7: Classification and Marking | - Packet marking (DSCP, CoS, IP Precedence) - Traffic classification methods |
Cisco Quality of Service (QoS) Sample Questions:
1. Refer to the exhibit. Why would applying the limit-interactive policy-map to the fa0/0 interface as shown below cause an error?
interface fa0/0 service-policy input limit-interactive
A) Class-based policing can only be applied in the output direction.
B) The interactive traffic class is missing the bandwidth {kbps} command.
C) TCP header compression can only be applied in the output direction.
D) The interactive class-map has not been configured.
E) There is already an output service-policy defined on the fa0/0 interface.
2. This policy-map is applied to a 128-kbps serial interface in the output direction. Which set of additional commands within this policy-map will improve the link efficiency on the serial interface?
policy-map test
class voice
priority 25
class telnet
bandwidth remaining percent 20
class ftp
bandwidth remaining percent 30
A) class ftp
compression header ip
B) class telnet
compression header ip tcp
C) class ftp
fair-queue
D) class voice
compression header ip tcp
E) class voice
no priority 25
bandwidth percent remaining 25
F) class telnet
fair-queue
3. In an unmanaged CE router implementation, how does the service provider enforce the SLA?
A) by using class-based random discard on the CE to PE link to limit the customer's input rate
B) by marking on the CE to PE link and using CBWFQ and CB-WRED on the PE to P link
C) by marking on the CE to PE link and using class-based policing on the PE to P link
D) by using class-based policing on the CE to PE link to limit the customer's input rate
4. Which QoS mechanism calculates the mean queue depth to determine its operation?
A) WFQ
B) WRED
C) class-based policing
D) class-based shaping
E) LLQ/CBWFQ
5. HOTSPOT
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: B | Question # 3 Answer: D | Question # 4 Answer: B | Question # 5 Answer: Only visible for members |
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