Which Layer 2 protocol provides loop resolution by managing the physical paths to given network
segments?
A.
root guard
B.
port fast
C.
HSRP
D.
STP
Explanation:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_configuration_example09186a008009
467c.shtml
Introduction
Spanning Tree Protocol (STP) is a Layer 2 protocol that runs on bridges and switches. The
specification for STP is IEEE 802.1D. The main purpose of STP is to ensure that you do not create
loops when you have redundant paths in your network. Loops are deadly to a network.