Bridged Virtual Systems in a cluster monitor which of the following protocols, to fail over a bridged system?

Question

Options

• AOSPF
• BMPLS
• CBPDU
• DSTP
• EVTP

• B
  1% (1)
• C
  94% (66)
• D
  1% (1)
• E
  3% (2)

Explanation

BPDU (Bridge Protocol Data Unit) is correct because bridged virtual systems in a cluster actively monitor BPDU frames - the control messages exchanged between network bridges - to detect bridge or link failures. When BPDU traffic stops being received, the cluster recognizes that the bridge has failed and triggers a failover to the standby system.

Why the distractors are wrong:

• A. OSPF - A Layer 3 link-state routing protocol; it has no role in Layer 2 bridge-level failover detection.
• B. MPLS - A label-switching forwarding mechanism operating at Layer 2.5/3; unrelated to bridge failover.
• D. STP - Spanning Tree Protocol is the framework that uses BPDUs, but the cluster monitors the actual BPDU frames themselves, not the abstract protocol.
• E. VTP - Cisco's VLAN Trunking Protocol propagates VLAN configuration; it plays no role in bridge failover.

Memory tip: Think "Bridges talk in BPDUs." If the bridge goes silent (no BPDUs), the cluster knows to fail over - so it monitors the bridge's own language, BPDU.

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