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