Match the port role to its description.

Explanation:
| Root | Forwards traffic to the root bridge. |
| Designated | Forwards traffic from a segment to the root bridge. |
| Backup | Immediately transitions to a forwarding port if an error occurs with the current forwarding port. |
| Alternate | Discarding state that quickly transitions to forwarding if needed. |
Related exam: 17.3.2 Module Quiz Answers - CCNA 200-301 Exam v1.1 Supplemental Module
