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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 route summary
And sees the following output:
Route Source Networks Subnets Replicates Overhead Memory (bytes) connected 2 0 0 0 512 static 1 0 0 0 256 ospf 1 5 0 0 0 1280 eigrp 100 3 0 0 0 768 bgp 65000 2 0 0 0 512 internal 1 0 0 0 256 Total 14 0 0 0 3584
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 router has 14 routes total, with OSPF contributing the most routes.
The show ip route summary output provides a count of routes from each source. It shows that OSPF has 5 routes, EIGRP has 3, BGP has 2, and static has 1. This can help identify if redistribution is working by comparing expected routes.
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 router has 14 routes total, with OSPF contributing the most routes.
Why this is correct
The output shows OSPF has 5 routes, which is the highest count. This indicates OSPF is learning many routes, possibly via redistribution.
- ✗
The router is not redistributing any routes because the counts are low.
Why it's wrong here
The counts are not necessarily low; redistribution could be occurring. Without baseline, we cannot conclude.
- ✗
BGP is the only protocol with external routes.
Why it's wrong here
The output does not differentiate between internal and external routes.
- ✗
EIGRP has 3 routes, all of which are redistributed from OSPF.
Why it's wrong here
The output does not show the origin of routes; they could be internal or redistributed.
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.
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Last reviewed: Jun 18, 2026
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