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300-410 Practice Question: Which TWO configuration changes will prevent a…
Which TWO configuration changes will prevent a specific route from being redistributed from OSPF into EIGRP using a route-map? (Choose TWO.)
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.
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.
- ✗
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.
Visual reference
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.
Go deeper
Related to this question
Learn chapter
OSPF Neighbor Adjacency and Basics
Key term
ACL for Routing Protocols
An ACL for Routing Protocols is a set of rules used to filter routing updates between routers, controlling which network routes are advertised or accepted to improve security and stability.
Key term
BGP Prefix Filtering
BGP Prefix Filtering is the practice of controlling which network routes (prefixes) a router accepts or advertises to its BGP neighbors, preventing unwanted or harmful routes from spreading across the internet.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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