- A
A distribute-list configured under the EIGRP process using an ACL will filter routes based on the source IP address of the EIGRP update, not the route prefix.
When using an ACL in a distribute-list under EIGRP, the ACL matches the source IP address of the router sending the update, not the route prefix itself. This is a common misconception.
- B
A prefix-list applied in a distribute-list under EIGRP can filter routes based on both the prefix and the prefix length, using ge and le operators.
Prefix-lists allow granular matching of prefix and prefix length using 'ge' (greater than or equal) and 'le' (less than or equal) operators, making them more flexible than ACLs for route filtering.
- C
An outbound distribute-list on an EIGRP router will prevent the router from installing filtered routes in its own routing table.
Why wrong: An outbound distribute-list filters routes being sent to neighbors; it does not affect the local router's routing table. Inbound distribute-lists filter routes being received and installed.
- D
If a distribute-list is applied both at the EIGRP process level and on a specific interface, the process-level distribute-list takes precedence for that interface.
Why wrong: Interface-specific distribute-lists override the process-level distribute-list for that interface. The more specific configuration takes precedence.
- E
The 'distance' command configured under EIGRP can be used to filter routes by setting the administrative distance to 255, which prevents the route from being installed.
Setting the administrative distance to 255 effectively filters the route because routes with AD 255 are not installed in the routing table. This is a valid method to filter routes.
Quick Answer
The correct answer is that the 'distance' command configured under EIGRP can be used to filter routes by setting the administrative distance to 255, which prevents the route from being installed. This works because an administrative distance of 255 tells the router that the route is unreachable, effectively filtering it from the routing table without removing it from the topology table. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding that EIGRP route filtering is not limited to distribute-lists or prefix-lists; the distance command is a subtle but valid filtering method. A common trap is assuming only distribute-lists or route-maps can filter, but the exam expects you to recognize that setting distance 255 is a legitimate filtering technique. For memory, think "255 kills the route from being alive in the table."
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An engineer is troubleshooting an EIGRP network where some routers are not learning all routes, and suspects a route filtering issue. Which TWO statements about EIGRP route filtering are true? (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
A distribute-list configured under the EIGRP process using an ACL will filter routes based on the source IP address of the EIGRP update, not the route prefix.
EIGRP route filtering can be applied using distribute-lists with ACLs or prefix-lists, and can filter inbound or outbound. Distribute-lists applied to the EIGRP process affect all interfaces, while interface-specific distribute-lists override the process-level. The 'prefix-list' can match prefixes and prefix lengths. The 'route-map' can also filter but is more complex. The 'distance' command does not filter routes; it changes administrative distance.
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.
- ✓
A distribute-list configured under the EIGRP process using an ACL will filter routes based on the source IP address of the EIGRP update, not the route prefix.
- ✓
A prefix-list applied in a distribute-list under EIGRP can filter routes based on both the prefix and the prefix length, using ge and le operators.
Why this is correct
Prefix-lists allow granular matching of prefix and prefix length using 'ge' (greater than or equal) and 'le' (less than or equal) operators, making them more flexible than ACLs for route filtering.
Related concept
Standard ACLs match source addresses.
- ✗
An outbound distribute-list on an EIGRP router will prevent the router from installing filtered routes in its own routing table.
Why it's wrong here
An outbound distribute-list filters routes being sent to neighbors; it does not affect the local router's routing table. Inbound distribute-lists filter routes being received and installed.
- ✗
If a distribute-list is applied both at the EIGRP process level and on a specific interface, the process-level distribute-list takes precedence for that interface.
Why it's wrong here
Interface-specific distribute-lists override the process-level distribute-list for that interface. The more specific configuration takes precedence.
- ✓
The 'distance' command configured under EIGRP can be used to filter routes by setting the administrative distance to 255, which prevents the route from being installed.
Why this is correct
Setting the administrative distance to 255 effectively filters the route because routes with AD 255 are not installed in the routing table. This is a valid method to filter routes.
Related concept
Standard ACLs match source addresses.
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.
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: A distribute-list configured under the EIGRP process using an ACL will filter routes based on the source IP address of the EIGRP update, not the route prefix. — EIGRP route filtering can be applied using distribute-lists with ACLs or prefix-lists, and can filter inbound or outbound. Distribute-lists applied to the EIGRP process affect all interfaces, while interface-specific distribute-lists override the process-level. The 'prefix-list' can match prefixes and prefix lengths. The 'route-map' can also filter but is more complex. The 'distance' command does not filter routes; it changes administrative distance.
What should I do if I get this 300-410 question wrong?
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 18, 2026
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