- A
Only routes matching prefix-list PL-1 are redistributed into EIGRP with metric 100; all other OSPF routes are denied.
Why wrong: Incorrect. The second permit sequence (20) with no match clause acts as a catch-all permit, so all routes are redistributed.
- B
Routes matching prefix-list PL-1 are redistributed with metric 100; all other OSPF routes are redistributed with metric 200.
Correct. Sequence 10 matches PL-1 and sets metric 100; sequence 20 matches all other routes and sets metric 200.
- C
The route-map is missing a deny statement; without it, all routes are permitted with default metric.
Why wrong: Incorrect. A route-map without a deny statement still permits routes; the set actions apply as configured.
- D
The route-map is applied to redistribution, but the metric values are ignored because redistribute command also specifies metric.
Why wrong: Incorrect. When a route-map is used with redistribute, the set metric in the route-map overrides the metric specified in the redistribute command.
Quick Answer
The answer is that routes matching prefix-list PL-1 are redistributed with metric 100, while all other OSPF routes receive metric 200. This occurs because the route-map metric setting in redistribution uses sequential permit clauses: the first sequence matches PL-1 and explicitly sets the metric to 100, and the second permit sequence acts as a catch-all with no match condition, setting the metric to 200 for any route that did not match the first. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of how route-map logic applies during redistribution, specifically that a permit sequence without a match clause will match all remaining routes, overriding any default or command-line metric. A common trap is assuming the redistribute command’s metric keyword (metric 1000 100 255 1 1500) applies to all routes, but the route-map’s set metric overrides it for matched sequences. Memory tip: think of route-map sequences as “first match wins”—the first permit sets the metric, and the second permit catches everything else, so no route is left with the default.
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.
Examine the following partial configuration on R1:
!--- R1 configuration route-map RMAP permit 10 match ip address prefix-list PL-1 set metric 100 ! route-map RMAP permit 20 set metric 200 !
router eigrp 100 network 10.0.0.0
redistribute ospf 1 metric 1000 100 255 1 1500 route-map RMAP !
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
Routes matching prefix-list PL-1 are redistributed with metric 100; all other OSPF routes are redistributed with metric 200.
The route-map RMAP has two permit sequences. The first matches prefix-list PL-1 and sets metric to 100. The second is a catch-all permit with no match, setting metric to 200. All redistributed OSPF routes will match either sequence and have their metric set accordingly. If a route matches the first sequence, its metric is set to 100; otherwise, it matches the second and gets metric 200. There is no deny sequence, so 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.
- ✗
Only routes matching prefix-list PL-1 are redistributed into EIGRP with metric 100; all other OSPF routes are denied.
Why it's wrong here
Incorrect. The second permit sequence (20) with no match clause acts as a catch-all permit, so all routes are redistributed.
- ✓
Routes matching prefix-list PL-1 are redistributed with metric 100; all other OSPF routes are redistributed with metric 200.
- ✗
The route-map is missing a deny statement; without it, all routes are permitted with default metric.
Why it's wrong here
Incorrect. A route-map without a deny statement still permits routes; the set actions apply as configured.
- ✗
The route-map is applied to redistribution, but the metric values are ignored because redistribute command also specifies metric.
Why it's wrong here
Incorrect. When a route-map is used with redistribute, the set metric in the route-map overrides the metric specified in the redistribute command.
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.
Trap categories for this question
Command / output trap
Incorrect. When a route-map is used with redistribute, the set metric in the route-map overrides the metric specified in the redistribute command.
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: Routes matching prefix-list PL-1 are redistributed with metric 100; all other OSPF routes are redistributed with metric 200. — The route-map RMAP has two permit sequences. The first matches prefix-list PL-1 and sets metric to 100. The second is a catch-all permit with no match, setting metric to 200. All redistributed OSPF routes will match either sequence and have their metric set accordingly. If a route matches the first sequence, its metric is set to 100; otherwise, it matches the second and gets metric 200. There is no deny sequence, so 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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