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300-410 Practice Question: Which THREE symptoms indicate a BFD session…
Which THREE symptoms indicate a BFD session failure? (Choose THREE.)
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
✓
The BFD neighbor state shows 'Down'
A BFD session failure typically results in the neighbor state being 'Down', the routing protocol (like OSPF or EIGRP) neighbor going down due to BFD's fast detection, and BFD timers expiring. The other options are not direct symptoms of a BFD session failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The BFD neighbor state shows 'Down'
Why this is correct
A 'Down' state directly indicates session failure.
- ✓
The OSPF neighbor state changes from Full to Down
Why this is correct
BFD triggers routing protocol neighbor down when BFD session fails.
- ✓
BFD timer expiry messages appear in logs
Why this is correct
Timer expiry indicates that BFD did not receive expected packets, leading to session failure.
- ✗
The interface MTU is set to 1500
Why it's wrong here
MTU setting is unrelated to BFD session state.
- ✗
The BFD discriminator value is zero
Why it's wrong here
Discriminator values are assigned during session setup; a zero value may indicate configuration issues but is not a standard symptom of session failure.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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