mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
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.
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.
Why this is correct
The output shows standard EIGRP update exchange. No redistribution issue is visible.
- ✗
The metric of 156160 indicates that the route 192.168.10.0/24 is redistributed from OSPF.
Why it's wrong here
Metric 156160 is a typical EIGRP composite metric; it does not indicate redistribution from OSPF.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
Route Redistribution Between Protocols
Route redistribution between protocols is the process of taking routes learned from one routing protocol and injecting them into another routing protocol so that networks using different protocols can communicate.
About these practice questions
This 300-410 question is part of Courseiva's 1,966-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.