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300-410 Practice Question: Two routers are configured with EIGRP using…
Two routers are configured with EIGRP using `network 0.0.0.0 0.0.0.0` to enable EIGRP on all interfaces. One router has a loopback interface with IP 10.1.1.1/32. The other router learns 10.1.1.1/32 via EIGRP. An engineer then configures `distribute-list prefix FILTER out` under the EIGRP process on the first router, where FILTER denies 10.1.1.1/32. Unexpectedly, the second router still receives the route. Which is the most likely explanation?
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
✓
The distribute-list out does not filter routes that are directly connected and enabled via the `network` command; it only filters redistributed routes.
In EIGRP, distribute-lists applied under the router process (classic mode) affect only routes that are redistributed or injected via `network` commands. However, if the route is directly connected and the interface is enabled for EIGRP via the `network` command, the distribute-list out does not filter connected routes advertised by the network statement. To filter such routes, the distribute-list must be applied under the interface configuration or use a prefix-list that matches the interface.
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 distribute-list out does not filter routes that are directly connected and enabled via the `network` command; it only filters redistributed routes.
Why this is correct
EIGRP distribute-list out filters only routes from redistribution; connected routes advertised via network statement are not affected.
- ✗
The distribute-list must be applied inbound on the second router to block the route.
Why it's wrong here
Outbound filtering should work, but the scope is limited to redistributed routes.
- ✗
The prefix-list FILTER is misconfigured; it should deny 10.1.1.1/32 with a ge/le condition.
Why it's wrong here
The prefix-list syntax is correct for exact match.
- ✗
The distribute-list command is not supported in classic mode; it must be used in named mode.
Why it's wrong here
Distribute-list is supported in both modes.
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
Introduction to ENARSI Exam and Network Fundamentals
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.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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