2. 计算机
  3. 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

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

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问题 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
F. None of the above
选项
答案B
解析 Explanation:
STP (spanning tree protocol) operates on layer 2 to prevent loops in switches and bridges.

Incorrect Answers:
A, C. RIP and IGRP are routing protocols, which are used at layer 3 to maintain a loop free routed environment.

D. CDP does indeed operate at layer 2, but it doest not provide for a loop free topology. CDP is used by Cisco devices to discover information about their neighbors.

E. VTP is the VLAN Trunking Protocol, used to pass VLAN information through switches. It relies on the STP mechanism to provide a loop free network.
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