STP Port States and Roles 2

Question 1

Which STP port role is assigned to the port that provides the best path from a non-root switch to the root bridge?

Accepted Answer

Root Port

Answer

Each non-root switch has exactly one Root Port, which is the port offering the lowest-cost path toward the root bridge.

Question 2

On each network segment, which STP port role is responsible for forwarding traffic toward the root bridge on behalf of that segment?

Accepted Answer

Designated Port

Answer

The Designated Port on each segment is the one elected to forward traffic from that segment toward the root bridge.

Question 3

In RSTP (802.1w), what is the name of the port role that provides an alternate path to the root bridge and can quickly take over if the Root Port fails?

Accepted Answer

Alternate Port

Answer

The Alternate Port in RSTP is a blocking port that offers a redundant path to the root bridge and can rapidly transition to Root Port if needed.

Question 4

What port role does the root bridge assign to ALL of its active ports?

Accepted Answer

Designated Port

Answer

All active ports on the root bridge are Designated Ports because the root bridge always has the best path cost (zero) to itself.

Question 5

In RSTP, which port role is in Discarding state and provides a backup to a Designated Port on the SAME switch segment?

Accepted Answer

Backup Port

Answer

A Backup Port is an RSTP port role that provides redundancy for a Designated Port on the same shared segment, but it stays in Discarding state.

(STP) Spanning Tree Protocol Practice Test

(STP) Spanning Tree Protocol Practice Test

STP Port States and Roles 2