Q. X.21 protocol consists of

  • (A) Physical and frame levels
  • (B) Frame and packet levels
  • (C) Physical, frame and packet levels
  • (D) Only physical level
✅ Correct Answer: (D) Only physical level

Published by Deepak Sahoo ⭐ 11.23K Points at 13-Nov-2021 05:21 am in Computer

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