- A
EIGRP is redistributing routes from another protocol into EIGRP, as indicated by the tag 0.
Why wrong: Tag 0 is the default; it does not indicate redistribution. Redistributed routes often have a non-zero tag but not always.
- B
R1 is learning 192.168.10.0/24 via EIGRP and advertising 10.2.2.0/24 back to the same neighbor, which could indicate a routing loop.
Why wrong: This is normal EIGRP operation; R1 learns a route and advertises its own route. There is no loop unless the same route is being sent back.
- C
R1 is receiving an EIGRP update and sending an update in response, which is normal EIGRP behavior.
The output shows standard EIGRP update exchange. No redistribution issue is visible.
- D
The metric of 156160 indicates that the route 192.168.10.0/24 is redistributed from OSPF.
Why wrong: Metric 156160 is a typical EIGRP composite metric; it does not indicate redistribution from OSPF.
Quick Answer
The correct interpretation is that R1 is receiving an EIGRP update and sending an update in response, which is normal EIGRP behavior, not a redistribution issue. This output shows a standard exchange of EIGRP update packets: R1 receives a route for 192.168.10.0/24 from neighbor 10.1.1.2, then enqueues and sends its own update for 10.2.2.0/24. The key technical concept here is that the debug eigrp packets command reveals the bidirectional flow of routing information, and without any error flags, retransmissions, or metric inconsistencies, this is simply the expected operation of the EIGRP protocol. On the Cisco CCNP ENARSI 300-410 exam, this tests your ability to distinguish between normal EIGRP packet exchange and actual redistribution problems—a common trap is assuming any update activity indicates a fault, when in fact redistribution issues typically manifest as missing routes, incorrect metrics, or administrative-distance conflicts, not in the basic packet flow shown here. A useful memory tip: if you see a clean send-and-receive cycle without retries or flag anomalies, think “normal neighborly chat,” not “redistribution trouble.”
300-410 Route Redistribution Practice Question
This 300-410 practice question tests your understanding of route redistribution. 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.
A network engineer runs the following command to troubleshoot a Route Redistribution issue:
R1# debug eigrp packets
And sees the following output:
*Mar 1 00:15:22.123: EIGRP: Received UPDATE on Serial0/0/0 nbr 10.1.1.2 *Mar 1 00:15:22.124: AS 100, Flags 0x1, Seq 45/0 idbQ 0/0 iidbQ un/rely 0/0 *Mar 1 00:15:22.125: Ext: 192.168.10.0/255.255.255.0, metric 156160, tag 0 *Mar 1 00:15:22.126: EIGRP: Enqueueing UPDATE on Serial0/0/0 nbr 10.1.1.2 iidbQ un/rely 0/1 peerQ un/rely 0/0 serno 12-12 *Mar 1 00:15:22.127: EIGRP: Sending UPDATE on Serial0/0/0 nbr 10.1.1.2, retry 0, R=1 *Mar 1 00:15:22.128: Ext: 10.2.2.0/255.255.255.0, metric 128256, tag 0
What does this output indicate?
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
R1 is receiving an EIGRP update and sending an update in response, which is normal EIGRP behavior.
The debug eigrp packets output shows EIGRP update packets being exchanged. R1 receives an update for 192.168.10.0/24 from neighbor 10.1.1.2 and then sends an update for 10.2.2.0/24. This indicates normal EIGRP operation; no redistribution issue is apparent from this output.
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.
- ✗
EIGRP is redistributing routes from another protocol into EIGRP, as indicated by the tag 0.
Why it's wrong here
Tag 0 is the default; it does not indicate redistribution. Redistributed routes often have a non-zero tag but not always.
- ✗
R1 is learning 192.168.10.0/24 via EIGRP and advertising 10.2.2.0/24 back to the same neighbor, which could indicate a routing loop.
Why it's wrong here
This is normal EIGRP operation; R1 learns a route and advertises its own route. There is no loop unless the same route is being sent back.
- ✓
R1 is receiving an EIGRP update and sending an update in response, which is normal EIGRP behavior.
- ✗
The metric of 156160 indicates that the route 192.168.10.0/24 is redistributed from OSPF.
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.
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: R1 is receiving an EIGRP update and sending an update in response, which is normal EIGRP behavior. — The debug eigrp packets output shows EIGRP update packets being exchanged. R1 receives an update for 192.168.10.0/24 from neighbor 10.1.1.2 and then sends an update for 10.2.2.0/24. This indicates normal EIGRP operation; no redistribution issue is apparent from this output.
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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