Question

In a network of LANs connected by bridges, packets are sent from one LAN to another through intermediate bridges. Since more than one path may exist between two LANs, packets may have to be routed through multiple bridges. Why is the spanning tree alogorithm used for bridge-routing?

• A. For avoiding loops in the routing paths
• B. For minimizing collisions
• C. For fault tolerance
• D. For shortest path routing between LANs

Answer 1

The correct option is A For avoiding loops in the routing paths

The spanning tree approach is a mechanism in which bridges automatically develop a routing table and update that table in response to changing topology. The algorithm consists of three machanisms.

1. Frame Forwarding
2. Address Learning
3. Loop resolution.