Multiple choice

Which WAN technology uses a fixed payload of 48 bytes and is transported across both switched and permanent virtual circuits?

  1. ATM

  2. ISDN

  3. Frame Relay

  4. metro Ethernet
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A Correct answer
Explanation

ATM (Asynchronous Transfer Mode) uses fixed-size 53-byte cells, consisting of a 5-byte header and 48-byte payload. This small, fixed cell size was chosen to reduce jitter and ensure predictable latency for voice and video traffic. ATM can operate over both Switched Virtual Circuits (SVCs), which are set up on demand, and Permanent Virtual Circuits (PVCs), which are pre-configured. ISDN uses 64kbps channels, Frame Relay uses variable-length frames, and Metro Ethernet uses standard Ethernet frames (not 48-byte payloads).

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