STP Port States and Roles

Question 1

How many port states exist in the original IEEE 802.1D Spanning Tree Protocol?

Accepted Answer

5

Answer

3

Answer

4

Answer

6

Question 2

In which STP port state does a switch port learn MAC addresses but NOT forward data frames?

Accepted Answer

Learning

Answer

Blocking

Answer

Listening

Answer

Forwarding

Question 3

A port in the Blocking state will do which of the following?

Accepted Answer

Receive BPDUs but not forward data frames

Answer

Forward data frames and send BPDUs

Answer

Learn MAC addresses and forward BPDUs

Answer

Neither send nor receive any traffic

Question 4

What is the default duration of the Listening state in IEEE 802.1D STP?

Accepted Answer

15 seconds

Answer

5 seconds

Answer

10 seconds

Answer

20 seconds

Question 5

Which STP port state is functionally equivalent to the Discarding state introduced in RSTP (802.1w)?

Accepted Answer

Blocking

Answer

Forwarding

Answer

Learning

Answer

Listening

Question 6

In which two STP port states does a port actively participate in sending and receiving BPDUs? (Choose the pair that applies)

Accepted Answer

Listening and Forwarding

Answer

Blocking and Disabled

Answer

Learning and Disabled

Answer

Disabled and Forwarding

Question 7

What total time does a port transitioning from Blocking to Forwarding take by default in IEEE 802.1D?

Accepted Answer

30 seconds

Answer

15 seconds

Answer

20 seconds

Answer

50 seconds