Download Cisco : 642-642 Questions & Answers as PDF & Test Software
Updated: Jun 03, 2026
No. of Questions: 87 Questions & Answers with Testing Engine
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Cisco Quality of Service (QoS) Sample Questions:
1. 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) 48000 bps
C) 80000 bps
D) 16000 bps
E) 96000 bps
F) 64000 bps
2. What are three reasons link efficiency mechanisms are deployed on WAN links? (Choose three.)
A) increase throughput
B) decrease delay
C) decrease jitter
D) increase link speed
E) decrease propagation delay
3. SIMULATION - LAB
A) Please click console
4. A major media company recently deployed a new converged network. The original network design used separate networks for graphics and video, interactive data, and voice. The company has been experiencing problems with voice traffic in the new converged network. Most of the time voice quality is perfectly acceptable. Periodically voice quality exhibits unacceptable choppy voice signals, and occasionally calls are dropped. At this time the company is not willing to simply add bandwidth to the network.
Which QoS solution would most likely help to resolve the problem?
A) Use TCP header compression and LFI to reduce delays.
B) Use class-based weighted fair queuing to prioritize voice traffic with a higher weight than all other traffic.
C) Use advanced technologies to compress all video and graphics traffic on the network.
D) Prioritize voice traffic as the highest priority to ensure that voice traffic is always serviced by the priority queue.
5. 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 ftp
fair-queue
C) class telnet
compression header ip tcp
D) class voice
compression header ip tcp
E) class telnet
fair-queue
F) class voice
no priority 25
bandwidth percent remaining 25
Solutions:
| Question # 1 Answer: F | Question # 2 Answer: A,B,C | Question # 3 Answer: A | Question # 4 Answer: D | Question # 5 Answer: C |
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