NSE7 Advanced Networking and SD-WAN Practice Question
A FortiGate administrator needs to configure BFD (Bidirectional Forwarding Detection) on a BGP peer to quickly detect link failures. Which CLI command enables BFD on the BGP neighbor 10.1.1.1?
⚠ Common exam trap
Test-takers frequently confuse enabling BFD on the interface (Option B) with enabling it on the BGP neighbor, not realizing that interface-level BFD only supports protocols like OSPF or static routes, not BGP sessions directly.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
config router bgp config neighbor edit 10.1.1.1 set bfd enable next end end
BFD must be enabled specifically under the BGP neighbor configuration to associate BFD with the BGP session. The `config router bgp` → `config neighbor` → `set bfd enable` command activates BFD for that neighbor, allowing rapid link failure detection independent of BGP hold timers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
config router policy set bfd enable end
Why it's wrong here
BFD is not configured under router policy.
- ✗
config system interface edit port1 set bfd enable next end
Why it's wrong here
BFD is not enabled on interfaces globally; it is configured per routing protocol neighbor.
- ✗
config router static set bfd enable end
Why it's wrong here
BFD is not configured on static routes directly; it is per protocol neighbor.
- ✓
config router bgp config neighbor edit 10.1.1.1 set bfd enable next end end
Why this is correct
BFD is enabled per neighbor under the BGP configuration.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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