To provide high-quality voice and take advantage of the full voice feature set, which two access layer switches provide support? (Choose two.)

Access layer switches provide QoS by employing multiple egress queues, allowing Real-time Transport Protocol (RTP) voice streams to be assigned to high-priority queues for expedited processing. This ensures low latency and jitter, which are critical for maintaining voice quality.

RSVP (Resource Reservation Protocol) is typically deployed in WAN environments for bandwidth reservation, not commonly at the access layer for per-hop QoS.

Mapping AF41/AF42 (typically for video) to a class-based queue is a QoS configuration, but voice primarily uses EF (Expedited Forwarding), and the question asks about general support provided by switches.

Using 802.1Q trunking enables VLAN support, while 802.1p carries Layer 2 Class of Service (CoS) markings, which are crucial for access layer switches to correctly identify, categorize, and prioritize voice packets. This ensures that QoS policies are preserved across network segments, allowing for proper treatment of voice traffic.

IP RTP header compression is a WAN optimization technique used on bandwidth-limited serial interfaces to reduce overhead, not a primary feature of access layer switches for local voice quality.