300-410 Route Maps and Route Filtering Practice Question
This 300-410 practice question tests your understanding of route maps and route filtering. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An engineer configures EIGRP named mode with an offset-list applied to the EIGRP topology table. The offset-list increases the metric of a route learned from a neighbor. However, the route is still used as the successor even though the offset-list increased its metric above the feasible distance (FD) of another route. Which is the most likely explanation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 advertised distance (AD), not the feasible distance (FD).
In EIGRP named mode, the offset-list is applied to the route's metric in the topology table, but it does not affect the feasible distance (FD) calculation. The FD is computed from the original metric before the offset. The successor is chosen based on the FD, not the offset metric, so the route remains the successor.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 is applied to the wrong interface; it must be applied to the outgoing interface.
Why it's wrong here
Offset-list can be applied in or out; the issue is not interface-specific.
✓
The offset-list only affects the advertised distance (AD), not the feasible distance (FD).
Why this is correct
Offset-list modifies the metric of the route but does not update the FD, which is the metric of the best path at the time of learning.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
The offset-list is applied in classic mode, but the router is running named mode.
Why it's wrong here
Named mode supports offset-list; the behavior is the same.
✗
The offset-list value is too small to change the successor; a larger value is needed.
Why it's wrong here
Even a large offset does not affect FD; the successor remains based on FD.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The offset-list only affects the advertised distance (AD), not the feasible distance (FD). — In EIGRP named mode, the offset-list is applied to the route's metric in the topology table, but it does not affect the feasible distance (FD) calculation. The FD is computed from the original metric before the offset. The successor is chosen based on the FD, not the offset metric, so the route remains the successor.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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