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642-144 IPTX – IP Telephony Express Exam

Where is the most likely source of echo?

Exhibit:

In this typical VoIP network, the digital packet portion of the network is sandwiched between two analog transmission segments. Cowpens is connected by FXS (two-wire analog) to a local VoIP gateway. The Cowpens gateway communicates with the Monotomy gateway through an IP WAN. This packet transmission segment has an end-to-end latency of greater than 30 ms. At the Monotomy end of the call path, the Phone is connected in the same manner as the Phone at Cowpens. Where is the most likely source of echo?

Which three steps will you use to correctly map 802.1p to DSCP on this L2 switch to accomplish this task?

You want to classify and mark the packets that are received by a router from a Catalyst 2900 XL. Your supervisor wants you to retag the packets at the router. The connection from the switch to the router must be a trunk in order to carry the Layer 2 CoS markings. The router interface is a Fast Ethernet interface. Which three steps will you use to correctly map 802.1p to DSCP on this L2 switch to accomplish this task? (Choose three.)


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