Question 430 of 2,152

EIGRP Troubleshooting →hardMultiple ChoiceObjective-mapped

EIGRP Distribute-List: Why It Doesn't Filter Connected Routes

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.

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 →

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.”

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: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

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
Standard ACLs match source addresses.
✗
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: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Real-world example

How this comes up in practice

A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.

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.

What to study next

Got this wrong? Here's your next step.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this 300-410 question test?

EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — Standard ACLs match source addresses..

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?

Standard ACLs match source addresses.

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