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Cisco 642-642 Exam Syllabus Topics:

Cisco Quality of Service (QoS) Sample Questions:

1. Refer to the exhibit. According to the show output, which statement is true?

A) The unknown protocol traffic statistics refer to all the traffic matched by the class-default traffic class.
B) HTTP is the most active protocol on the Fa0/0 interface based on byte count.
C) NBAR protocol discovery has been enabled on the router through the use of the match protocol commands within the class-map.
D) There is a total of 39,990 NetBIOS packets exiting the Fa0/0 interface.
E) The 5-minute average bits-per-second rate for all traffic entering the Fa0/0 interface is 398 kbps.

2. DRAG DROP
Drop

3. What is the purpose of the qos pre-classify command?

A) to enable the IOS to classify the packet based on the original IP header instead of the tunnel IP header
B) to enable the IOS to copy the ToS field from the outer tunnel IP header back into the original IP header
C) to enable class-based marking on tunnel interface
D) to enable the IOS to classify the packet based on the outer tunnel IP header instead of the original IP header
E) to enable class-based marking on IPSec crypto maps
F) to enable the IOS to copy the ToS field from the original IP header to the outer tunnel IP header

4. 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) packet size based discard
C) random discard
D) tail discard

5. Switch port fa0/2 has been configured to connect an IP phone with an attached PC. Given the set of commands shown below, where does the trust boundary lie?
interface fa0/2 mls qos trust cos mls qos trust device cisco-phone switchport voice vlan 112

A) between the PC port and the LAN port on the IP phone
B) between the IP phone and the switch
C) between the access layer switch and the distribution layer switch
D) between the IP phone and the PC

Solutions: