Refer to the exhibit. The network uses STP. All switches use the default priority and have the same bandwidth. Which description of the network is true?

Question

Exhibits

Options

• AS3 is elected as the root bridge
• BS2 is elected as the root bridge
• CHost A can always reach host B through S1
• DThe redundant links between the switches are blocked

• A
  3% (1)
• B
  7% (2)
• C
  3% (1)
• D
  86% (25)

Explanation

The core purpose of Spanning Tree Protocol (STP) is to prevent Layer 2 loops in redundant switch topologies. When redundant links exist between switches, STP elects a root bridge and then places redundant (non-root, non-designated) ports into a Blocking state. This means traffic cannot traverse those ports, eliminating the loop. Options A and B cannot be determined without knowing the MAC addresses of S2 and S3 (since default priority is the same for all, the lowest MAC address wins root bridge election - this requires the exhibit). Option C is incorrect because STP may reroute traffic around failed links, and the active path may not always go through S1. Option D is correct because STP's fundamental mechanism is to block redundant links to maintain a loop-free topology.

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