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350-401 · Question #1038

In a campus network design, what are two benefits of using BFD for failure detection? (Choose two.)

The correct answer is A. BFD speeds up routing convergence time. D. BFD provides path failure detection in less than a second.. BFD significantly improves network resilience by enabling ultra-fast detection of path failures, which in turn reduces the time required for routing protocols to reconverge.

Submitted by jaden.t· Mar 6, 2026

Question

In a campus network design, what are two benefits of using BFD for failure detection? (Choose two.)

Options

  • ABFD speeds up routing convergence time.
  • BBFD is an efficient way to reduce memory and CPU usage.
  • CBFD provides fault tolerance by enabling multiple routers to appear as a single virtual router.
  • DBFD provides path failure detection in less than a second.
  • EBFD enables network peers to continue forwarding packets in the event of a restart.

How the community answered

(68 responses)
  • A
    90% (61)
  • B
    1% (1)
  • C
    6% (4)
  • E
    3% (2)

Why each option

BFD significantly improves network resilience by enabling ultra-fast detection of path failures, which in turn reduces the time required for routing protocols to reconverge.

ABFD speeds up routing convergence time.Correct

BFD provides sub-second failure detection, allowing routing protocols like OSPF, EIGRP, or BGP to be notified of a link or path failure almost immediately, thereby speeding up the overall routing convergence time.

BBFD is an efficient way to reduce memory and CPU usage.

While BFD is lightweight, its primary benefit is fast detection, not necessarily a significant reduction in memory and CPU usage compared to other protocols, as it still consumes resources.

CBFD provides fault tolerance by enabling multiple routers to appear as a single virtual router.

This describes the function of First Hop Redundancy Protocols (FHRP) like HSRP or VRRP, not BFD. BFD detects failures, it doesn't provide virtual routing.

DBFD provides path failure detection in less than a second.Correct

BFD's primary purpose is to provide highly aggressive and rapid detection of forwarding path failures, typically within milliseconds to less than a second, which is much faster than traditional routing protocol hello mechanisms.

EBFD enables network peers to continue forwarding packets in the event of a restart.

BFD detects failures; it does not enable network peers to continue forwarding packets during a restart; that is typically handled by non-stop forwarding (NSF) or graceful restart features of routing protocols.

Concept tested: BFD benefits for failure detection

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bfd/configuration/xe-16/ire-bfd-xe-16-book/ire-bfd-overview.html

Topics

#BFD#Failure Detection#Routing Convergence

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