Switching

Question 1

Portfast

Answer 1

Causes port to enter forwarding state immediately, bypassing listening and learning states. Only enable on host ports

spanning-tree portfast edge

Question 2

Root Guard

Answer 2

Prevents a port from becoming a root port. Forces interface to become a designated port to prevent surrounding switches from becoming a root switch. If a better bpdu is received on the port, Root Guard err disables port. Enable on all access ports.

spanning-tree guard root

Question 3

BPDU Guard

Answer 3

Puts interface into err disabled upon receipt of a BPDU. This is to avoid a bridging loop and an authorized switch from becoming the root bridge.

spanning-tree portfast edge bpduguard default

spanning-tree boduguard enable

Question 4

BPDU Filter

Answer 4

Disables STP on a port by preventing them from sending or receiving a BPDU. Takes precedence over a BPDU guard.

spanning-tree bpdu filter default
spanning-tree bpdu filter enable