STP

Question 1

Root Guard

Answer 1

Prevents a port from becoming a root. This stops downstream switches from becoming a root. Places port into Root-inconsistent state

Question 2

BPDU Guard

Answer 2

Pairs with portfast. Puts a port into Err-Disable if a BPDU is detected.

Question 3

BPDU Filter

Answer 3

Blocks only BPDUs. Be careful using

Question 4

Loop Guard

Answer 4

Prevents ports from becoming designated due to BPDU loss.

Configured on the root port.

Question 5

UDLD

Answer 5

Unidirectional Link Detection

Has a normal and aggressive mode. Sends info to a device and a copy is sent in reply. detects if one side of a fiber connection is down

Question 6

802.1D

Answer 6

STP

Original standard. Long convergence time. Listening, learning, forwarding, disabled, blocking, and broken states

Question 7

802.1W

Answer 7

RSTP

Shorter convergence time. Discard, learning, and forwarding states. Convergence doesn’t have to be 100% done to forward packets

Question 8

PVST/RPVST

Answer 8

Cisco proprietary. Allows for multiple instances of STP on one device.

Question 9

802.1s

Answer 9

MST. Allows multiple instances of STP on one device. Maps VLANs to an MST instance.