Question 430 of 2,152

EIGRP Troubleshooting →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the distribute-list out does not filter directly connected routes enabled via the network command; it only filters redistributed routes. In EIGRP, when an interface is explicitly enabled under the routing process using `network 0.0.0.0 0.0.0.0`, the connected route on that interface is advertised as an internal EIGRP route, not as a redistributed route. A distribute-list applied under the EIGRP process in classic mode only filters routes that are injected through redistribution or via a `network` statement that does not match a directly connected interface—it cannot override the automatic advertisement of a connected interface’s prefix. On the Cisco CCNP ENARSI 300-410 exam, this is a classic trap: candidates assume a distribute-list under the router process universally filters all outbound updates, but it specifically excludes connected routes. To block such routes, you must apply the distribute-list under the interface configuration or use a prefix-list that matches the interface itself. Memory tip: “Connected routes are native; distribute-lists under the process only filter the imported.”

300-410 EIGRP Troubleshooting Practice Question

This 300-410 practice question tests your understanding of eigrp troubleshooting. 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.

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?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1hardmultiple choice

Study the full EIGRP explanation →

A
The distribute-list out does not filter routes that are directly connected and enabled via the `network` command; it only filters redistributed routes.
EIGRP distribute-list out filters only routes from redistribution; connected routes advertised via network statement are not affected.
B
The distribute-list must be applied inbound on the second router to block the route.
Why wrong: Outbound filtering should work, but the scope is limited to redistributed routes.
C
The prefix-list FILTER is misconfigured; it should deny 10.1.1.1/32 with a ge/le condition.
Why wrong: The prefix-list syntax is correct for exact match.
D
The distribute-list command is not supported in classic mode; it must be used in named mode.
Why wrong: Distribute-list is supported in both modes.

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

✓

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.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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.
Clue confirmation
The clue words "first", "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
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.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this 300-410 question test?

EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: 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.

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

Are there clue words in this question I should notice?

Yes — watch for: "first", "most likely". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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