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
题目
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