When Virtual systems are deployed in Bridge mode, they use _________ to detect failures and forward traffic to another Virtual System in a cluster?

Question

Options

• AVRRP
• BSTP
• CMPLS
• DPBDU
• EOSPF

• B
  90% (37)
• C
  2% (1)
• D
  2% (1)
• E
  5% (2)

Explanation

STP (Spanning Tree Protocol) is correct because Bridge mode operates at Layer 2, and STP is the Layer 2 protocol designed to detect topology changes (link/node failures) and converge traffic to an alternate path - in this case, redirecting to the surviving Virtual System in the cluster.

Why the distractors are wrong:

• A. VRRP is a Layer 3 redundancy protocol for default gateway failover, not applicable to Layer 2 Bridge mode deployments.
• C. MPLS is a traffic-forwarding/labeling technology used in WANs, not a failure-detection mechanism for HA clusters.
• D. PBDU is a nonsense distractor - the real term is BPDU (Bridge Protocol Data Unit), which is the frame format STP uses, not a protocol itself. Recognizing the reversed acronym is a classic exam trap.
• E. OSPF is a Layer 3 link-state routing protocol and has no role in Bridge/Layer 2 failure detection.

Memory tip: Match the layer - Bridge mode = Layer 2, and STP is the Layer 2 loop-prevention and failover protocol. If you see "bridge" in a clustering question, think "Spanning Tree."

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