Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network?A. RIPB. STPC. IGRPD. CDPE. VTPF. None of the above

Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network?

A. RIP

B. STP

C. IGRP

D. CDP

E. VTP

F. None of the above


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