CompTIA Network+ N10-006 Q417

Ann, a technician, connects a pair of switches using redundant links. When she checks the status of the links, one of them is not active, even when she changes ports. Which of the following MOST likely disabled the redundant connection to the other switch?

A. Spanning tree
B. IGRP routing
C. SSID mismatch
D. Port mirroring

Correct Answer: A

Explanation/Reference:
http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/5234-5.html