Cisco 642-642 Q&A - in .pdf

  • Exam Code: 642-642
  • Exam Name: Quality of Service (QoS)
  • Updated: Sep 02, 2026
  • Q & A: 87 Questions and Answers
  • PDF Price: $59.99
  • Printable Cisco 642-642 PDF Format. It is an electronic file format regardless of the operating system platform.
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Cisco 642-642 Q&A - Testing Engine

  • Exam Code: 642-642
  • Exam Name: Quality of Service (QoS)
  • Updated: Sep 02, 2026
  • Q & A: 87 Questions and Answers
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Cisco 642-642 Exam Syllabus Topics:

SectionObjectives
Topic 1: Congestion Management- Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ)
Topic 2: QoS Implementation on Cisco Devices- Modular QoS CLI (MQC) configuration
- End-to-end QoS deployment considerations
Topic 3: Classification and Marking- Traffic classification methods
- Packet marking (DSCP, CoS, IP Precedence)
Topic 4: QoS Fundamentals- Introduction to Quality of Service concepts
- QoS models and architectures (Best Effort, IntServ, DiffServ)
Topic 5: Link Efficiency Mechanisms- Fragmentation and interleaving (LFI, MLP QoS concepts)
Topic 6: Traffic Policing and Shaping- Policing mechanisms and configuration concepts
- Traffic shaping techniques and use cases
Topic 7: Congestion Avoidance- Random Early Detection (RED, WRED)

Cisco Quality of Service (QoS) Sample Questions:

Question 1

DRAG DROP
Drop


Question 2

When configuring WFQ, what is the default number of dynamic queues based on?

A. hold-queue limit
B. drop probability denominator
C. inter-packet arrival rate
D. interface bandwidth
E. hash of the packet headers
F. congestive discard threshold (CDT)


Question 3

Which two different traffic types have the most similar sensitivity to latency, jitter, and packet loss? (Choose two.)

A. SQL transactions
B. voice signaling
C. video conferencing
D. peer-to-peer file sharing
E. streaming video
F. voice


Question 4

HOTSPOT


Question 5

Which command is typically applied to the voice traffic class within a policy-map?

A. random-detect dscp-based
B. shape average {bps}
C. bandwidth {kbps}
D. shape peak {bps}
E. compress header ip rtp
F. fair-queue


Solutions:

Question 1
Answer: Only visible for members
Question 2
Answer: D
Question 3
Answer: C,F
Question 4
Answer: Only visible for members
Question 5
Answer: A,E

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