hardMultiple 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# show ip eigrp topology 192.168.10.0/24
And sees the following output:
IP-EIGRP (AS 100): Topology entry for 192.168.10.0/24 State: Passive, Originating, 1 successors, FD is 128256 Routing Descriptor Blocks:
0.0.0.0 (Null0), from 0.0.0.0, Send flag 0x0
Composite metric is (128256/0), Route is Internal Vector metric: Minimum bandwidth is 100000 Kbit Total delay is 5000 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 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
✓
The route is redistributed into EIGRP from another protocol, such as OSPF or BGP.
The show ip eigrp topology command shows a route that is in Passive state and marked as Originating, with the next hop as 0.0.0.0 (Null0). This indicates that the route is a summary route or a redistributed route that is being originated by this router. The metric 128256 and hop count 0 suggest it is a directly connected or redistributed route.
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 route 192.168.10.0/24 is learned from an EIGRP neighbor.
Why it's wrong here
The next hop is 0.0.0.0, which means the route is locally originated, not learned from a neighbor.
- ✗
The route is a summary route configured on this router.
Why it's wrong here
While summary routes also show as originating, the output does not show any summary flag. The route is likely redistributed.
- ✓
The route is redistributed into EIGRP from another protocol, such as OSPF or BGP.
Why this is correct
The route is in Passive state, originating, with next hop 0.0.0.0, indicating it is locally injected into EIGRP, typically via redistribution.
- ✗
The route is a connected interface that is advertised in EIGRP.
Why it's wrong here
Connected interfaces also show as originating, but they would have a different metric and vector metric values. The metric 128256 is typical for redistributed routes.
Visual reference
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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