hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures EIGRP named mode with an…
An engineer configures EIGRP named mode with an offset-list that increases the metric of a route on Router A. The route is still selected as the best path on Router A's neighbor, Router B, because Router B learns the same prefix via another EIGRP neighbor with a higher metric. Which is the most likely explanation?
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 offset-list only affects the feasible distance (FD) on Router A; the advertised distance (AD) sent to Router B remains unchanged.
The offset-list in EIGRP affects the composite metric (FD) of the route on the router where it is applied. However, the advertised distance (AD) sent to neighbors is not modified. Router B still sees the original AD from Router A and compares it with metrics from other neighbors.
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 offset-list modifies the advertised distance (AD) sent to neighbors, but Router B ignores it.
Why it's wrong here
Offset-list only changes the feasible distance (FD), not the AD.
- ✓
The offset-list only affects the feasible distance (FD) on Router A; the advertised distance (AD) sent to Router B remains unchanged.
Why this is correct
Router B uses the AD from Router A for its feasibility condition and metric comparison; the offset-list does not alter the AD.
- ✗
The offset-list is applied to the wrong interface; it must be applied to the outgoing interface towards Router B.
Why it's wrong here
Offset-list can be applied in or out, but it still only affects FD on the router where it is applied.
- ✗
EIGRP named mode does not support offset-list; only classic mode supports it.
Why it's wrong here
Named mode supports offset-list with the `offset-list` command under the address-family.
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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