Day 21-4 Flashcards - Loop Guard

A […] is a network link where data transmission occurs in only one direction.

unidirectional link

Unidirectional links are typically caused by Layer […] issues.

1

[STP optional feature] protects against loops caused by unidirectional links.

Loop Guard

When a Loop Guard-enabled port's Max Age counts down to 0, it enters the […] state.

Broken (Loop Inconsistent)

Enable Loop Guard on a port: / SW1(config-if)# […]

spanning-tree guard loop

Enable Loop Guard by default: / SW1(config)# […]

spanning-tree loopguard default

Disable Loop Guard on a port: / SW1(config-if)# […]

spanning-tree guard none

On which ports does the command spanning-tree loopguard default enabled Loop Guard?

All ports

Loop Guard and Root Guard [can/can't] be enabled on the same port at the same time.

can't

If you configure spanning-tree guard loop on a port and then spanning-tree guard root, which feature is active on the port?

Root Guard / *the second command replaces the first

If you configure spanning-tree loopguard default in global config mode and then spanning-tree guard root on a port, which feature is active on the port?

Root Guard

When will a Loop Guard-enabled port automatically recover?

When it starts receiving BPDUs again