- A
The interface is configured for redistribution, which is correct for EIGRP.
Why wrong: EIGRP redistribution is configured globally under the EIGRP process, not per interface.
- B
The 'redistributed' flag indicates that routes are being redistributed into EIGRP on this interface, which is not a standard EIGRP feature.
EIGRP does not have per-interface redistribution; this output is likely from a different context or a misinterpretation.
- C
The interface has one EIGRP neighbor, and redistribution is working correctly.
Why wrong: The neighbor count is normal, but redistribution is not an interface-level feature.
- D
The output shows that redistribution is enabled, but the interface is not sending hellos.
Why wrong: The hello interval is shown, so hellos are being sent.
Quick Answer
The answer is that the 'redistributed' flag in the EIGRP interface output indicates a misconfiguration, as redistribution is a global process and cannot be applied per interface. This flag appears under the Redistribution field in the `show ip eigrp interfaces detail` command, but standard Cisco IOS does not display such a field; its presence suggests that redistribution was incorrectly configured under the interface configuration mode rather than the EIGRP routing process. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding that EIGRP redistribution is controlled globally via the `redistribute` command under `router eigrp`, not on a specific interface. A common trap is confusing interface-level filtering (like `distribute-list`) with redistribution itself. Remember the memory tip: "Redistribution is a router-wide decision, not a port-specific permission."
300-410 Route Redistribution Practice Question
This 300-410 practice question tests your understanding of route redistribution. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
A network engineer runs the following command on Router R1:
R1# show ip eigrp interfaces detail GigabitEthernet0/1
IP-EIGRP interfaces for process 100
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Gi0/1 1 0/0 10 0/10 50 0 Hello interval is 5 sec Next xmit serial <none> Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/0 Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0 Retransmissions: 0 Out of sequence: 0 Authentication mode: none Redistribution: redistributed
Based on this output, what is the problem?
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 'redistributed' flag indicates that routes are being redistributed into EIGRP on this interface, which is not a standard EIGRP feature.
The output shows 'Redistribution: redistributed' under the interface details, indicating that redistribution is enabled on this interface. However, this is not a standard field in 'show ip eigrp interfaces detail' output; it is likely a custom or misinterpreted output. The problem is that redistribution is applied per interface, but EIGRP redistribution is a global process, not interface-specific. This could cause confusion or misconfiguration.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 interface is configured for redistribution, which is correct for EIGRP.
Why it's wrong here
EIGRP redistribution is configured globally under the EIGRP process, not per interface.
- ✓
The 'redistributed' flag indicates that routes are being redistributed into EIGRP on this interface, which is not a standard EIGRP feature.
- ✗
The interface has one EIGRP neighbor, and redistribution is working correctly.
Why it's wrong here
The neighbor count is normal, but redistribution is not an interface-level feature.
- ✗
The output shows that redistribution is enabled, but the interface is not sending hellos.
Why it's wrong here
The hello interval is shown, so hellos are being sent.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
The hello interval is shown, so hellos are being sent.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Route Redistribution — This question tests Route Redistribution — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The 'redistributed' flag indicates that routes are being redistributed into EIGRP on this interface, which is not a standard EIGRP feature. — The output shows 'Redistribution: redistributed' under the interface details, indicating that redistribution is enabled on this interface. However, this is not a standard field in 'show ip eigrp interfaces detail' output; it is likely a custom or misinterpreted output. The problem is that redistribution is applied per interface, but EIGRP redistribution is a global process, not interface-specific. This could cause confusion or misconfiguration.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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