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Question 71

X.21 is

  1. AA method of determining which device has access to the transmission medium at any time
  2. BA method access control technique or multiple access transmission media
  3. CVery common but oriented at linked protocol issued to ISO
  4. DA network access standard for connecting stations to a circuit switch network
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Correct answer: (D) A network access standard for connecting stations to a circuit switch network

Explanation

X.21 is an ITU-T standard interface for connecting stations (DTE) to circuit-switched digital networks.

From DSSSB TGT Computer Science Practice Set 4

This is question 71 of DSSSB TGT Computer Science Practice Set 4. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.