642-812 Test Preparation

642-812 Exam
Building Cisco Multilayer Switched Networks
* Exam Number/Code : 642-812
* Exam Name : Building Cisco Multilayer Switched Networks
* Questions and Answers : 227 Q&As
* Update Time: 2010-06-08
* Price: $ 120.00

Exam : Cisco 642-812
Title : BCMSN – Building Converged Cisco Multilayer Switched Networks

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. 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.
C. Ad hoc mode allows mobile clients to connect directly without an intermediate AP.
D. Another term for infrastructure mode is independent service set (IBSS).
E. The Aironet 1230 access point is an example of an access point that operates solely as a lightweight access point.
F. WLANs are designed to share the medium and can easily handle an increased demand of channel contention.
Answer: ABC

3. Which statement is true about RSTP topology changes?
A. Any change in the state of the port generates a TC BPDU.
B. Only nonedge ports moving to the forwarding state generate a TC BPDU.
C. If either an edge port or a nonedge port moves to a block state, then a TC BPDU is generated.
D. Only nonedge ports moving to the blocking state generate a TC BPDU.
E. Any loss of connectivity generates a TC BPDU.
Answer: B

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