Multiple choice general knowledge

Which of the following is an Internet layer protocol ?

  1. UDP

  2. ISDN

  3. TELNET

  4. IPSec
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

IPSec operates at the Internet layer (Layer 3) providing security for IP communications. UDP is a Transport layer protocol, ISDN operates at Data Link and Physical layers, and TELNET is an Application layer protocol.

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