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
  14% (4)
• B
  4% (1)
• C
  4% (1)
• E
  79% (22)

Explanation

Two-person videoconferencing is PTP (Point-to-Point) bidirectional because it involves exactly two endpoints communicating with each other, and both parties can simultaneously send and receive video/audio - making it bidirectional by nature.

Why the distractors are wrong:

• A & B (Point-to-multipoint): These involve one source transmitting to multiple destinations (like a webinar or broadcast), not a simple two-party call.
• B (Unidirectional variant): Even if it were two endpoints, unidirectional means only one side transmits - you'd be watching, not conversing.
• C (Unidirectional): A one-way video feed (e.g., a live stream or surveillance camera) - no back-and-forth communication.
• D (PTP unidirectional): Correct topology (two points), but wrong direction - one person would send while the other could only receive, not respond.

Memory tip: Think "conversation = two people (PTP) + both talking (bidirectional)." If you can interrupt the other person, it's bidirectional; if you can only watch, it's unidirectional.

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