mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to verify EIGRP routes…
A network engineer runs the following command to verify EIGRP routes over DMVPN:
R1# show ip eigrp topology all-links
P 10.10.10.0/24, 1 successors, FD is 128256 via 10.0.0.2 (128256/128256), Tunnel0 via 10.0.0.3 (131072/128256), Tunnel0
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
✓
The route has a successor via 10.0.0.2 and a feasible successor via 10.0.0.3.
The output shows two paths for 10.10.10.0/24: one via 10.0.0.2 with feasible distance 128256 (successor), and one via 10.0.0.3 with reported distance 128256 (feasible successor).
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 route 10.10.10.0/24 has two equal-cost paths via Tunnel0.
Why it's wrong here
Incorrect because the FDs are different (128256 vs 131072), so not equal-cost.
- ✓
The route has a successor via 10.0.0.2 and a feasible successor via 10.0.0.3.
Why this is correct
Correct: The successor has the lowest FD, and the other path has a reported distance equal to the FD, making it a feasible successor.
- ✗
Both paths are in active state and being queried.
Why it's wrong here
Incorrect because both are passive (P).
- ✗
The route is not reachable because both paths are down.
Why it's wrong here
Incorrect because the route is passive and has successors.
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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