Question 1,968 of 2,152

Route Maps and Route Filtering →hardMultiple SelectObjective-mapped

Quick Answer

The answer is to add a match ip address prefix-list command that references a prefix-list with a deny entry, inside a route-map deny clause. This configuration works because route-map processing evaluates match conditions sequentially; when a deny clause is matched, the route is blocked from redistribution, effectively preventing route redistribution using route-map logic. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your understanding of redistribution filtering mechanisms, often appearing as a multiple-select question where you must identify two correct changes. A common trap is confusing a distribute-list under EIGRP with route-map filtering—distribute-lists only filter routing updates, not redistribution itself. Another pitfall is assuming a permit clause with no match will block routes; in reality, it permits everything. Remember the memory tip: "Deny the match, block the catch"—if you want to block a specific route, pair a deny clause with a match that points to a deny entry in your prefix-list.

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.

Which TWO configuration changes will prevent a specific route from being redistributed from OSPF into EIGRP using a route-map? (Choose TWO.)

Question 1hardmulti select

Review the full OSPF breakdown →

A
Configure a route-map with a deny clause that matches the route, and apply it to the redistribution command.
Correct. A deny clause in the route-map will prevent the route from being redistributed.
B
Apply a distribute-list out under the EIGRP process that denies the route.
Why wrong: Incorrect. Distribute-lists under EIGRP filter routes from the routing table, not redistribution into EIGRP.
C
Use a route-map with a permit clause and no match statement, then apply it to the redistribution.
Why wrong: Incorrect. A permit clause with no match permits all routes, including the one you want to block.
D
Create a prefix-list that denies the route, then use match ip address prefix-list in a route-map permit clause.
Why wrong: Incorrect. A match in a permit clause will permit the route if it matches the prefix-list. To deny, you need a deny clause or a prefix-list that denies and a permit clause (which would still deny because the match fails). Actually, if the prefix-list denies, the match fails, and the route-map clause is not applied; the route then falls to the next clause or implicit deny. This could block the route if no later permit clause matches. However, the most direct and common method is a deny clause. This option is ambiguous; the typical correct answer is to use a deny clause. Therefore, this option is considered incorrect because it is not a direct configuration change that prevents redistribution—it relies on implicit deny.
E
Add a match ip address prefix-list command that references a prefix-list with a deny entry, inside a route-map deny clause.
Correct. The deny clause will block the route, and the prefix-list with deny ensures the match is specific.

Full breakdown with real-world context →

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

✓

Configure a route-map with a deny clause that matches the route, and apply it to the redistribution command.

To block redistribution, you can either match the route with a deny clause in the route-map, or use a prefix-list that denies the route and reference it in a match clause. A distribute-list under EIGRP is not used for redistribution filtering. A route-map with a permit clause and no match will permit all routes. A match ip address prefix-list with a permit entry will permit the route.

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.

✓
Configure a route-map with a deny clause that matches the route, and apply it to the redistribution command.
Why this is correct
Correct. A deny clause in the route-map will prevent the route from being redistributed.
Related concept
OSPF neighbours must agree on key parameters.
✗
Apply a distribute-list out under the EIGRP process that denies the route.
Why it's wrong here
Incorrect. Distribute-lists under EIGRP filter routes from the routing table, not redistribution into EIGRP.
✗
Use a route-map with a permit clause and no match statement, then apply it to the redistribution.
Why it's wrong here
Incorrect. A permit clause with no match permits all routes, including the one you want to block.
✗
Create a prefix-list that denies the route, then use match ip address prefix-list in a route-map permit clause.
Why it's wrong here
Incorrect. A match in a permit clause will permit the route if it matches the prefix-list. To deny, you need a deny clause or a prefix-list that denies and a permit clause (which would still deny because the match fails). Actually, if the prefix-list denies, the match fails, and the route-map clause is not applied; the route then falls to the next clause or implicit deny. This could block the route if no later permit clause matches. However, the most direct and common method is a deny clause. This option is ambiguous; the typical correct answer is to use a deny clause. Therefore, this option is considered incorrect because it is not a direct configuration change that prevents redistribution—it relies on implicit deny.
✓
Add a match ip address prefix-list command that references a prefix-list with a deny entry, inside a route-map deny clause.
Why this is correct
Correct. The deny clause will block the route, and the prefix-list with deny ensures the match is specific.
Related concept
OSPF neighbours must agree on key parameters.

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: Configure a route-map with a deny clause that matches the route, and apply it to the redistribution command. — To block redistribution, you can either match the route with a deny clause in the route-map, or use a prefix-list that denies the route and reference it in a match clause. A distribute-list under EIGRP is not used for redistribution filtering. A route-map with a permit clause and no match will permit all routes. A match ip address prefix-list with a permit entry will permit the route.

What should I do if I get this 300-410 question wrong?

What is the key concept behind this question?

OSPF neighbours must agree on key parameters.

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