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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: | Testlet, Multiple Choice, Multiple Answer, Simulation |
| Related Certifications: | Cisco Certified Network Professional (CCNP) Cisco Certified Internetwork Professional (CCIP) |
| Real Exam Qty: | Approximately 55-65 questions |
| Certificate Validity Period: | Retired exam |
| Exam Price: | USD 250 |
| Exam Duration: | 90 minutes |
| Passing Score: | Variable (Cisco does not publish a fixed passing score) |
| Available Languages: | English |
| Recommended Training: | Cisco QoS Training |
| Exam Registration: | Cisco Certification Exam Registration |
| Sample Questions: | Cisco 642-642 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: Classification and Marking | - Layer 2 and Layer 3 marking - Network-based application recognition and classification - Modular QoS CLI classification and marking |
| Topic 2: Link Efficiency Mechanisms | - Compression technologies - Link fragmentation and interleaving |
| Topic 3: QoS Management and Implementation | - QoS policy configuration and verification - QoS monitoring and troubleshooting - QoS deployment considerations |
| Topic 4: Congestion Avoidance | - Random Early Detection - Weighted Random Early Detection |
| Topic 5: Introduction to Quality of Service | - Traffic classification and marking concepts - QoS models and architectures - QoS concepts and requirements |
| Topic 6: QoS for Voice and Video Applications | - End-to-end QoS deployment - IP telephony QoS design considerations - Voice traffic requirements |
| Topic 7: Congestion Management | - Queuing mechanisms - Low Latency Queuing - Class-Based Weighted Fair Queuing |
Cisco Quality of Service (QoS) Sample Questions:
Question 1
When configuring WFQ, what is the default number of dynamic queues based on?
A. interface bandwidth
B. hash of the packet headers
C. congestive discard threshold (CDT)
D. drop probability denominator
E. hold-queue limit
F. inter-packet arrival rate
Question 2
Which three factors will affect processing delay? (Choose three.)
A. queuing mechanism
B. router architecture
C. type of media
D. CPU speed
E. distance of media
F. IP switching method
Question 3
Refer to the exhibit. A typical configuration involving an IP phone with an attached PC is shown. According to QoS recommendations, at which demarcation line (shown as dotted lines) would the trust boundary normally exist?
A. D
B. C
C. A
D. B
Question 4
What does the following command accomplish?
router(config-pmap-c)# shape fecn-adapt
A. enables the router to lower the shaping rate when BECN bits are received
B. enables the router to respond to BECN bits by creating test frames in the opposite direction with the FECN bit set
C. enables the router to lower the shaping rate when FECN bits are received
D. enables the router to increase the shaping rate when BECN bits are received
E. enables the router to respond to FECN bits by creating test frames in the opposite direction with the BECN bit set
F. enables the router to increase the shaping rate when FECN bits are received
Question 5
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. tail discard
C. random discard
D. packet size based discard
Solutions:
| Question 1 Answer: A | Question 2 Answer: B,D,F | Question 3 Answer: D | Question 4 Answer: E | Question 5 Answer: B |
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