hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip route summary IP routing table maximum-paths: 32 IP routing table has 15 routes, using 900 bytes of memory
Number of prefixes: /8: 1, /16: 2, /20: 3, /24: 9 Route types: Connected: 4, Static: 1, OSPF: 10 Route sources: OSPF: 10, Connected: 4, Static: 1
Based on this output, what is a potential issue regarding route summarization?
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
✓
There are too many /24 prefixes, suggesting poor summarization.
The routing table has many /24 prefixes (9), indicating that route summarization is not being used effectively, leading to a larger routing table.
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 routing table is too small.
Why it's wrong here
15 routes is not large, but the issue is lack of summarization.
- ✓
There are too many /24 prefixes, suggesting poor summarization.
Why this is correct
Having 9 /24 prefixes indicates that more specific routes are present, and summarization could reduce the table size.
- ✗
There are too many OSPF routes.
Why it's wrong here
10 OSPF routes is not excessive.
- ✗
The routing table is empty.
Why it's wrong here
There are 15 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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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