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Exam
: Cisco 642-812
Title
: BCMSN - Building
Converged Cisco Multilayer
Switched Networks
Version : Demo
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1. Refer to the exhibit. What is the effect on the trust boundary of configuring the command mls qos trust
cos on the switch port that is connected to the IP phone?
A. Effectively the trust boundary has been moved to the IP phone.
B. The host is now establishing the CoS value and has effectively become the trust boundary.
C. The switch is rewriting packets it receives from the IP phone and determining the CoS value.
D. The switch will no longer tag incoming voice packets and will trust the distribution layer switch to set the
CoS.
E. RTP will be used to negotiate a CoS value based upon bandwidth utilization on the link.
Answer: A
2. Refer to the exhibit. What is the effect when the switchport priority extend cos 3 command is configured
on the switch port interface connected to the IP phone?
A. Effectively, the trust boundary has been moved to the PC attached to the IP phone.
B. The computer is now establishing the CoS value and has effectively become the trust boundary.
C. The IP phone is enabled to override with a CoS value of 3 the existing CoS marking of the PC attached
to the IP phone.
D. The switch will no longer tag incoming voice packets and will extend the trust boundary to the distribution
layer switch.
E. RTP will be used to negotiate a CoS value based upon bandwidth utilization on the link.
Answer: C
3. Which three WLAN statements are true? (Choose three.)
A. A lightweight AP receives control and configuration from a WLAN controller to which it is associated.
B. A WLAN client that is operating in half-duplex mode will delay all clients in that WLAN.
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C. Ad hoc mode allows mobile clients to connect directl