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Cisco 642-642 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Congestion Management | - Queuing mechanisms (FIFO, WFQ, CBWFQ, LLQ) |
| Classification and Marking | - Traffic classification methods - Packet marking (DSCP, CoS, IP Precedence) |
| QoS Fundamentals | - QoS models and architectures (Best Effort, IntServ, DiffServ) - Introduction to Quality of Service concepts |
| Traffic Policing and Shaping | - Policing mechanisms and configuration concepts - Traffic shaping techniques and use cases |
| Link Efficiency Mechanisms | - Fragmentation and interleaving (LFI, MLP QoS concepts) |
| Congestion Avoidance | - Random Early Detection (RED, WRED) |
| QoS Implementation on Cisco Devices | - Modular QoS CLI (MQC) configuration - End-to-end QoS deployment considerations |
Cisco Quality of Service (QoS) Sample Questions:
What does the following command accomplish?
router(config-pmap-c)# shape fecn-adapt
- A. enables the router to increase the shaping rate when FECN bits are received
- B. enables the router to respond to FECN bits by creating test frames in the opposite direction with the BECN bit set
- C. enables the router to lower the shaping rate when FECN bits are received
- D. enables the router to respond to BECN bits by creating test frames in the opposite direction with the FECN bit set
- E. enables the router to lower the shaping rate when BECN bits are received
- F. enables the router to increase the shaping rate when BECN bits are received
Correct Answer: B 🗳️
Explanation: Only visible for VCE4Plus members. You can sign-up / login (it's free).
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. A
- C. C
- D. B
Correct Answer: D 🗳️
Explanation: Only visible for VCE4Plus members. You can sign-up / login (it's free).
What are two errors in this policy-map configuration? (Choose two.)
policy-map test
class voice
priority 64
class bulk
bandwidth percent 20
fair-queue
class interactive
bandwidth percent remaining 10
fair-queue
class class-default
fair-queue
- A. The priority command cannot be used with the bandwidth command within the same policy-map.
- B. WFQ cannot be configured for the class-default traffic class.
- C. The bandwidth command is missing for the class-default traffic class.
- D. The bandwidth units for the bulk and interactive traffic classes are inconsistent.
- E. The voice traffic class should have the no fair-queue command.
- F. WFQ cannot be configured for the bulk and interactive traffic classes.
Correct Answer: D,F 🗳️
Explanation: Only visible for VCE4Plus members. You can sign-up / login (it's free).
Which element is mandatory for QoS policy propagation through BGP operations?
- A. MQC
- B. QoS pre-classify
- C. MPLS
- D. CEF
- E. policy-based routing
- F. NBAR
Correct Answer: D 🗳️
Explanation: Only visible for VCE4Plus members. You can sign-up / login (it's free).
Which two different traffic types have the most similar sensitivity to latency, jitter, and packet loss? (Choose two.)
- A. voice
- B. video conferencing
- C. SQL transactions
- D. streaming video
- E. peer-to-peer file sharing
- F. voice signaling
Correct Answer: A,B 🗳️
Explanation: Only visible for VCE4Plus members. You can sign-up / login (it's free).
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