Which two access layer switches provide support to provide high-quality voice and take advantage of...

Use multiple egress queues to provide priority queuing of RTP voice packet streams and the ability to classify or reclassify traffic and establish a network trust boundary.

Use 808.IQ trunking and 802.lp for proper treatment of Layer 2 CoS packet marking on ports with phones connected.

Implement IP RTP header compression on the serial interface to reduce the bandwidth requlreq per voice call on point-to-point links.

Deploy RSVP to improve VoIP QoS only where it can have a positive Impact on quality and functionality where there Is limited bandwidth and frequent network congestion.

Map audio and video streams of video calls (AF41 and AF42) to a class-based queue with weighted random early detection.