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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

R1 R2 R3 R4 10 100 10 100 OSPF picks R1→R2→R4 (cost 20) over R1→R3→R4 (cost 200)

Quick reference

Routing Protocol Comparison

ProtocolMetricMax HopsAlgorithmType
RIP v2Hop count15Bellman-FordDistance vector
OSPFCost (bandwidth)UnlimitedDijkstra (SPF)Link state
EIGRPComposite metricUnlimitedDUALHybrid
IS-ISCostUnlimitedDijkstraLink state
BGPPolicy / attributesUnlimitedPath vectorPath 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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