BFD determines whether a fault has occurred by periodically detecting packets. It is a fast fault detection mechanism that relies on routing protocols.

Question

Options

• ATRUE
• BFALSE
• C
• D

• A
  14% (5)
• B
  72% (26)
• C
  6% (2)
• D
  8% (3)

Explanation

B (FALSE) is correct because the statement contains a critical error: BFD (Bidirectional Forwarding Detection) does not rely on routing protocols - it is explicitly designed to operate independently of them. BFD is a lightweight, protocol-agnostic mechanism that sends control packets between two endpoints to detect forwarding path failures. While routing protocols (OSPF, BGP, IS-IS, etc.) can use BFD to receive faster failure notifications, BFD itself has no dependency on them. This independence is actually BFD's core advantage - it detects link failures far faster than any routing protocol's own hello/keepalive timers could.

Why A (TRUE) is wrong: Accepting the statement as true would mean routing protocols are required for BFD to function, which contradicts BFD's design. BFD can detect faults on links where no routing protocol is running at all.

Memory tip: Think of BFD as a heartbeat monitor sitting beneath routing protocols. The doctor (routing protocol) reads the monitor, but the monitor works on its own - it doesn't need the doctor to keep beeping. BFD = Below, Fast, Decoupled.

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