mediumMultiple Choice
300-410 Practice Question: Runs the following command to verify BFD with…
A network engineer runs the following command to verify BFD with EIGRP:
R1# show ip eigrp 100 topology 10.2.2.0/24
EIGRP-IPv4 Topology Entry for AS(100)/ID(10.2.2.0/24) State: Passive, Query origin flag: 1, 1 Successor(s), FD is 131072 Descriptor Blocks:
10.1.1.2 (GigabitEthernet0/0), from 10.1.1.2, Send flag: 0x0
Composite metric: (131072/130816), Route is Internal Vector metric: Minimum bandwidth is 100000 Kbit Total delay is 100 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 1 Originating router is 2.2.2.2 BFD enabled, BFD state: UP
What does this output indicate?
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
✓
EIGRP is using BFD with state UP, providing sub-second convergence.
The output shows that BFD is enabled for the EIGRP neighbor and the BFD state is UP, indicating fast failure detection is active for this route.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
EIGRP is using BFD with state UP, providing sub-second convergence.
Why this is correct
The topology entry shows BFD enabled with state UP on the successor path via GigabitEthernet0/0. Because BFD detects link failure in milliseconds rather than waiting for EIGRP hold timers, the adjacency is torn down faster, delivering the sub-second convergence described.
- ✗
EIGRP has no BFD session for this neighbor.
Why it's wrong here
The descriptor block explicitly reports BFD enabled with state UP, so a session exists and is operational for this neighbour. Absence of a session is what you would see when BFD is unconfigured or the neighbour lacks it, not in this output.
- ✗
BFD is down, so EIGRP relies on its own hello/dead timers.
Why it's wrong here
The output states BFD state UP, so the session is established and EIGRP is not falling back to hello/dead timers. That fallback occurs when BFD reports Down or no session exists, which is not the case here.
- ✗
EIGRP is using BFD in passive mode only.
Why it's wrong here
Passive describes the EIGRP topology state, meaning the route is stable with no queries outstanding, not a BFD mode. BFD has no passive mode; it negotiates asynchronous or demand echo sessions, and the output separately states BFD state UP.
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
This 300-410 practice question is part of Courseiva's free Cisco 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 300-410 exam.