NSE7 Advanced Networking and SD-WAN Practice Question
Which BFD mode is used to detect forwarding path failures between two FortiGates that are directly connected?
⚠ Common exam trap
Many exam-takers confuse 'echo mode' with the default mode because echo mode can be used to reduce overhead, but asynchronous mode is the standard and mandatory mode for BFD operation between directly connected peers.
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
✓
Asynchronous mode
Asynchronous mode is the default BFD mode used between two directly connected FortiGates to detect forwarding path failures. In this mode, both peers periodically send control packets at negotiated intervals, and if a peer stops receiving these packets within the detection multiplier, the session is declared down. This allows rapid detection of link or forwarding failures without relying on echo packets or on-demand triggers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Synchronous mode
Why it's wrong here
No such BFD mode.
- ✗
Echo mode
Why it's wrong here
Echo mode uses echo packets; optional, not default.
- ✗
Demand mode
Why it's wrong here
Demand mode reduces hello packets; not typical for direct connections.
- ✓
Asynchronous mode
Why this is correct
Default mode with periodic hello packets.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 practice question is part of Courseiva's free Fortinet certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the NSE7 exam.