What two features in Cisco switches help prevent Layer 2 loops? (Choose two.)

The correct answer is A. UniDirectional Link Detection F. loop guard. The STP loop guard feature provides additional protection against Layer 2 forwarding loops (STP loops). An STP loop is created when an STP blocking port in a redundant topology erroneously transitions to the forwarding state. This usually happens because one of the ports of a…

Layer 2 Technologies

Question

Options

AUniDirectional Link Detection
BHot Standby Router Protocol
CVirtual Router Redundancy Protocol
DPortFast
Eroot guard
Floop guard

How the community answered

(30 responses)

A
90% (27)
D
7% (2)
E
3% (1)

Explanation

The STP loop guard feature provides additional protection against Layer 2 forwarding loops (STP loops). An STP loop is created when an STP blocking port in a redundant topology erroneously transitions to the forwarding state. This usually happens because one of the ports of a physically redundant topology (not necessarily the STP blocking port) no longer receives STP BPDUs. In its operation, STP relies on continuous reception or transmission of BPDUs based on the port role. The designated port transmits BPDUs, and the non-designated port receives BPDUs.

Topics

#UDLD#loop guard#Layer 2 loop prevention#switch features

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