Which of the following is NOT a function of SDP?

Question

Options

• ADescribes session attributes.
• BNegotiates session attributes.
• CTransmits session contents.
• DUnifies session parameters of all the participants.

• A
  1% (1)
• B
  10% (7)
• C
  83% (58)
• D
  6% (4)

Explanation

SDP (Session Description Protocol) is a format for describing multimedia sessions, but it never carries the actual media data itself. Option C is correct because transmitting session contents (audio, video, data streams) is the job of transport protocols like RTP - SDP only describes what the session will look like, not what flows through it.

Why the distractors are wrong:

• A is a core SDP function - SDP documents describe session attributes like codecs, ports, and bandwidth.
• B is also a key SDP role - in protocols like SIP, SDP is exchanged in an offer/answer model to negotiate what both sides can support.
• D is what SDP achieves through that offer/answer negotiation - it ensures all participants agree on the same session parameters before the session begins.

Memory tip: Think of SDP as a contract, not a conveyor belt. It drafts and negotiates the terms of the call (describe, negotiate, unify), but once the call starts, a different protocol (RTP) does the actual delivering.

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