Computer Science · Computer Networks
The ITU-T Recommendation X.21 is defined as:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1An interface standard for synchronous operation on public data networks connecting stations to a circuit-switched network.✓
- 2A bit-oriented synchronous link layer protocol issued by ISO.
- 3A medium access control technique for multiple access transmission media.
- 4A method of determining which device has access to the transmission medium at any time.
Correct answer
An interface standard for synchronous operation on public data networks connecting stations to a circuit-switched network.
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