Which statements are true about BFD? (Select two.)

Question

Options

• ABFD provides very fast link error detection but uses more resources than routing protocol fast
• BBFD can be configured only over Ethernet links.
• CBFD not only detects link failures but also speeds up routing event propagation between
• DBFD is resource efficient, as some function can be supported directly in the hardware.
• EBFD is routing protocol independent and can work with all modern routing protocols.
• FBFD can be enabled either globally or per interface.

• A
  2% (1)
• B
  2% (1)
• C
  5% (3)
• D
  89% (55)
• F
  3% (2)

Explanation

BFD (Bidirectional Forwarding Detection) is correctly described by D and E. Option D is true because BFD sessions can be offloaded to hardware ASICs on capable platforms, making it highly resource-efficient compared to software-only keepalive mechanisms. Option E is true because BFD is routing protocol independent - it provides a generic failure detection service that can be used by OSPF, EIGRP, BGP, IS-IS, and static routes. Option A is incorrect because BFD is actually more resource-efficient than routing protocol hello timers. Option B is false - BFD supports multiple link types including serial, ATM, and others, not just Ethernet. Option C is incorrect because BFD detects failures and notifies the routing protocol, but it does not itself propagate routing events.

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