When designing a video communications network, which type of video communication link is two- person videoconferencing?

Question

Options

• APoint-to-multipoint bidirectional
• BPoint-to-multipoint unidirectional
• CUnidirectional
• DPTP unidirectional
• EPTP bidirectional

• A
  10% (4)
• C
  2% (1)
• D
  83% (35)
• E
  5% (2)

Explanation

There appears to be an error in the provided answer key. For two-person videoconferencing, the correct answer should be E (PTP bidirectional), not D.

Two-person videoconferencing is a point-to-point (PTP) connection because there are exactly two endpoints communicating directly with each other. It is bidirectional because both participants simultaneously send and receive audio and video - each person is both a transmitter and a receiver. Option D (PTP unidirectional) is incorrect because unidirectional means data flows in only one direction, like a broadcast or surveillance feed, where one side transmits and the other only receives.

Option A (point-to-multipoint bidirectional) describes a setup where one source connects to multiple destinations and all can respond, such as a multi-party video call with interactive participants. Option B (point-to-multipoint unidirectional) fits a one-to-many broadcast, like a live stream where viewers cannot respond. Option C (unidirectional) alone describes any one-way link regardless of topology. Option D (PTP unidirectional) would describe something like a one-way surveillance camera feed between two specific points.

Memory tip: PTP = two people, bidirectional = both talk. If you can talk back, it is bidirectional. If only one person sends, it is unidirectional. Two-person video call always means PTP bidirectional (E).

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