Root_Loop_Guard_flashcards

Question 1

Front

Answer 1

Back

Question 2

[Optional STP feature] prevents a port from accepting superior BPDUs.

Answer 2

Root Guard

Question 3

If a Root Guard enabled port receives a superior BPDU, it will enter the […] state.

Answer 3

Root-Inconsistent

Question 4

Enable Root Guard:
SW1(config-if)# […]

Answer 4

spanning-tree guard root

Question 5

What does a status of BKN mean in the output ofshow spanning-tree?

Answer 5

Broken
(i.e. blocked by Root Guard or Loop Guard)

Question 6

What happens when a port disabled by Root Guard stops receiving superior BPDUs?

Answer 6

The port is re-enabled

Question 7

[STP optional feature] prevents Non-Designated or Root ports from becoming Designated ports after they stop receiving BPDUs.

Answer 7

Loop Guard

Question 8

[STP optional feature] can prevent unidirectional links and ports that stop sending BPDUs from causing loops.

Answer 8

Loop Guard

Question 9

Enable Loop Guard:
SW1(config-if)# […]

Answer 9

spanning-tree guard loop

Question 10

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

Answer 10

spanning-tree loopguard default

Question 11

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

Answer 11

can’t

Question 12

If a Loop Guard enabled port stops receiving BPDUs, it will enter the […] state.

Answer 12

Loop Inconsistent

Question 13

What happens when a port disabled by Loop Guard starts receiving BPDUs again?

Answer 13

It is re-enabled