Which statement describes SDP's role in a session?

• A. SDP describes session parameters such as media types, formats, and timing.
• B. SDP encodes media samples for transmission
• C. SDP authenticates users for the session
• D. SDP manages transport layer encryption

Answer: (A)

SDP describes how a session will be carried. It specifies what media types will be used (audio, video), which codecs and formats are acceptable, and the timing and network details for the streams (such as ports and clock rates). It provides the negotiation payload that signaling protocols use to agree on session parameters before media starts, but it does not carry or encode the actual media itself. Authentication and encryption are handled by other mechanisms (such as TLS or SRTP), not by SDP. By listing the media description, codecs, formats, and timing, SDP lets endpoints know how to receive and render the streams.