Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? (Choose two.)

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QUESTION 21
Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? (Choose two.)
A. 802.1d
B. VTP
C. 802.1q
D. STP
E. SAP
Correct Answer: AD
Section: Switching
Explanation
Explanation/Reference:
The Spanning Tree Protocol (STP) is used to prevent layer 2 loops, and this is standardised as the IEEE 802.1d standard.