Which one is the loopback address?

Which one is the loopback address?

  1. a) 255.255.255.0
  2. b) 127.0.0.1
  3. c) 255.0.0.0
  4. d) 127.127.127.0

From the Combined Bank Senior Officer October 2021 – Preliminary exam, question 49 of 108.

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