- A
All routes from neighbor 10.0.0.1 are permitted; routes with tag 100 have their tag changed to 200.
Correct. Sequence 10 changes the tag for routes with tag 100; sequence 20 permits all others.
- B
Routes with tag 100 are denied; all other routes are permitted.
Why wrong: Incorrect. The route-map has permit sequences, so routes with tag 100 are permitted but have their tag changed.
- C
Only routes with tag 100 are permitted; all other routes are denied.
Why wrong: Incorrect. Sequence 20 is a catch-all permit, so all routes are permitted.
- D
The route-map is misconfigured because sequence 20 has no match statement; it should have a match any statement.
Why wrong: Incorrect. A permit sequence with no match statement matches all routes; it is a valid catch-all.
Quick Answer
The answer is that all routes from neighbor 10.0.0.1 are permitted, with routes carrying tag 100 having their tag changed to 200. This is correct because the route-map SETTAG uses two permit sequences: sequence 10 explicitly matches tag 100 and applies the set tag 200 action, while sequence 20 acts as an implicit permit-all with no match or set statements, ensuring no routes are filtered. On the Cisco CCNP ENARSI 300-410 exam, this configuration tests your understanding of how route-map sequence logic works with BGP tag manipulation—specifically that a permit sequence without a match clause allows all unmatched routes through unchanged. A common trap is assuming a missing match statement denies traffic, but in route-maps, only an explicit deny or a missing permit sequence at the end will filter. Remember the memory tip: "Permit without match is a catch-all pass; only deny blocks the path."
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.
Router R4 has the following configuration:
!--- R4 configuration route-map SETTAG permit 10 match tag 100 set tag 200 ! route-map SETTAG permit 20 !
router bgp 65100 neighbor 10.0.0.1 route-map SETTAG in
!
What is the effect of this configuration?
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
All routes from neighbor 10.0.0.1 are permitted; routes with tag 100 have their tag changed to 200.
The route-map SETTAG has two permit sequences. Sequence 10 matches routes with tag 100 and sets the tag to 200. Sequence 20 is a catch-all permit with no match or set statements. Routes from neighbor 10.0.0.1 that have tag 100 will have their tag changed to 200; all other routes are permitted unchanged. No routes are filtered.
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.
- ✓
All routes from neighbor 10.0.0.1 are permitted; routes with tag 100 have their tag changed to 200.
Why this is correct
Correct. Sequence 10 changes the tag for routes with tag 100; sequence 20 permits all others.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
Routes with tag 100 are denied; all other routes are permitted.
Why it's wrong here
Incorrect. The route-map has permit sequences, so routes with tag 100 are permitted but have their tag changed.
- ✗
Only routes with tag 100 are permitted; all other routes are denied.
Why it's wrong here
Incorrect. Sequence 20 is a catch-all permit, so all routes are permitted.
- ✗
The route-map is misconfigured because sequence 20 has no match statement; it should have a match any statement.
Why it's wrong here
Incorrect. A permit sequence with no match statement matches all routes; it is a valid catch-all.
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.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
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: All routes from neighbor 10.0.0.1 are permitted; routes with tag 100 have their tag changed to 200. — The route-map SETTAG has two permit sequences. Sequence 10 matches routes with tag 100 and sets the tag to 200. Sequence 20 is a catch-all permit with no match or set statements. Routes from neighbor 10.0.0.1 that have tag 100 will have their tag changed to 200; all other routes are permitted unchanged. No routes are filtered.
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.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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