642-437 試験問題を無料オンラインアクセス

What is the function of TEHO in a path selection strategy?

• A.Defines each site with a unique site code.
• B.Uses the WAN link for call routing to avoid PSTN charges.
• C.Uses the WAN link for call routing to avoid PSTN charges; in addition, the PSTN breakout should be as close as possible to the final PSTN destination.
• D.Allows users to place an intersite call by dialing a site code.

Which networking feature typically is used on an IP phone that is also connected to a local computer to maintain separation between the voice and data traffic?

• A.port security
• B.quality of service
• C.class of service
• D.virtual LAN

If a centralized solution has to be implemented on multiple-equipment vendors devices, which signaling protocol should be used?

• A.Media Gateway Control Protocol
• B.Session Initiation Protocol
• C.Skinny Client Control Protocol
• D.H.323 protocol

DRAG DROP
Drag the signaling methods from the left and drop them in the correct position in the graphic on the right. Some methods are used more than once, and some methods may not be used at all.

正解：

Explanation:

The one thing that distinguishes a PRI from other interfaces is the fact that the data that is received from the PSTN on the D-channel and needs to be carried in its raw form back to the Cisco CallManager to be processed. The gateway does not process or change this signalling data, it simply passes it onto the Cisco CallManager through TCP port 2428. The gateway is still responsible for the termination of the Layer 2 data. That means that all the Q.921 data-link layer connection protocols are terminated on the gateway, but everything above that (Q.931 network layer data and beyond) is passed onto the Cisco CallManager. This also means that the gateway does not bring up the D-channel unless it can communicate with Cisco CallManager to backhaul the Q.931 messages contained in the D-channel.
http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00801da84e.shtml

In the destination patterns, which wildcard symbol indicates a single-digit placeholder?

• A.. (period)
• B.()
• C.+
• D.%