400-007 · Question #52
You are designing a network for a branch office. In order to improve convergence time, you are required to use the BFD feature. Which four routing protocols can you use to facilitate this? (Choose…
The correct answer is A. IS-IS B. static D. EIGRP E. BGP. BFD accelerates failure detection by pairing with routing protocols that have native BFD support; RIP lacks BFD integration in Cisco IOS implementations.
Question
You are designing a network for a branch office. In order to improve convergence time, you are required to use the BFD feature. Which four routing protocols can you use to facilitate this? (Choose four.)
Options
- AIS-IS
- Bstatic
- CRIP
- DEIGRP
- EBGP
How the community answered
(33 responses)- A91% (30)
- C9% (3)
Why each option
BFD accelerates failure detection by pairing with routing protocols that have native BFD support; RIP lacks BFD integration in Cisco IOS implementations.
IS-IS has native BFD support, allowing BFD hello packets to detect link failures faster than IS-IS hello timers alone.
Static routes support BFD via the 'ip route static bfd' command, enabling BFD to track next-hop reachability and remove the static route on failure.
Cisco IOS does not support BFD integration with RIP, making RIP unable to use BFD for improved convergence.
EIGRP supports BFD through the 'bfd all-interfaces' or per-interface command, enabling sub-second failure detection independent of EIGRP hello timers.
BGP supports BFD via 'neighbor <ip> fall-over bfd', allowing BFD to trigger BGP session teardown far faster than the BGP hold-time expiry.
Concept tested: BFD support across routing protocols
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bfd/configuration/xe-16/irb-xe-16-book/bfd.html
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