多項選擇題In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？ （）

A. H·323
B. UDP
C. RTP
D. TCP
E. Media Gateway Control Protocol （MGCP）
F. session initiation protocol （SIP）


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3.多項選擇題Which two statements about the open and shared key wireless-authentication methods are true？ （）

A. Shared key authentication is considered more secure than open authentication.
B. Shared key authentication is considered less secure than open authentication.
C. If the WEP keys do not match using the open authentication method， the client will not authenticate， associate， and transfer data.
D. If the WEP keys do not match using the open authentication method， the client will still be able to authenticate and associate， but will not transfer data.
E. If the WEP keys do not match using the open authentication method， the client will still be able to authenticate， associate， and transfer data.

4.多項選擇題What are two features of WCS wireless management？ （）

A. centralized management for autonomous access points
B. centralized management for lightweight access points
C. integration with the Location Appliance to expand real time tracking to 1500 devices for 30 days
D. integration with the Location Appliance to expand real time tracking to 2500 devices for 15 days
E. the inclusion of an integrated AAA server
F. an external AAA-server requirement

5.多項選擇題What are two features of WLSE-Express wireless management？ （）

A. centralized management for autonomous access points
B. centralized management for lightweight access points
C. centralized management that requires an external AAA server
D. centralized management with integrated AAA server
E. integration with the Location Appliance to expand real time tracking to 1500 devices for 30 days
F. integration with the Location Appliance to expand real time tracking to 2500 devices for 30 days

6.多項選擇題When a router converts analog signals to digital signals， what three steps are always included in the process？ （）

A. involution
B. encoding
C. sampling
D. quantization
E. compression
F. companding

7.單項選擇題Which statement is true about the comparison of voice traffic with video traffic？（）

A. Video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
B. Latency requirements are less stringent for video traffic than for voice traffic.
C. Video traffic is less sensitive to dropped packets than for voice traffic.
D. Video traffic requires the retransmission capabilities of TCP whereas voice uses UDP.
E. Voice traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
F. Voice traffic requires the retransmission capabilities of TCP whereas video uses UDP.

8.多項選擇題What are two steps needed to define a QoS policy for a traffic class？（）

A. Determine a minimum bandwidth guarantee.
B. Determine interfaces to which to apply policy.
C. Assign priorities to the class.
D. Configure access control lists.

9.多項選擇題What are three considerations when choosing the QoS model to deploy in a network？ （）

A. the routing protocols being utilized in the network
B. the applications utilizing the network
C. the traffic destinations
D. network addressing scheme
E. cost of implementation
F. the amount of the control needed of the resources

10.多項選擇題Which three statements are true about the application of QoS models？ （）

A. The DiffServ model requires applications to signal the network with QoS requirements.
B. The DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses.
C. The DiffServ model requires RSVP.
D. The best effort model is suitable for applications such as file transfer and e-mail
E. The IntServ model requires applications to signal the network with QoS requirements.
F. The IntServ model attempts to deliver a level of service based on the QoS specified by each packet