mediumMultiple Choice
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 eigrp interfaces detail GigabitEthernet0/0
IP-EIGRP interfaces for process 100
Interface Peers Xmit Queue Mean Pacing Time Multicast Pending
Un/Reliable SRTT Un/Reliable Flow Timer Routes Gi0/0 1 0/0 10 0/10 50 0 Hello interval: 5 sec, Hold time: 15 sec Split horizon is enabled Summary address: 10.0.0.0/8 Next xmit serial <none> Un/reliable mcasts: 0/0 Un/reliable ucasts: 0/0 Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 0 Retransmissions: 0 Retry timer: 15 Hello packets sent: 100, received: 99
Based on this output, what is the purpose of the summary address configured on this interface?
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
✓
It advertises a summary route 10.0.0.0/8 to neighbors.
The 'Summary address: 10.0.0.0/8' line shows that a manual summary route is configured on this interface, which will be advertised to EIGRP neighbors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It filters all routes in the 10.0.0.0/8 range.
Why it's wrong here
The summary address advertises a single aggregate 10.0.0.0/8 to EIGRP peers; it does not filter or deny routes in that range. Filtering would require a distribute-list. Summarisation is correct when you want to reduce the number of routes advertised out an interface.
- ✓
It advertises a summary route 10.0.0.0/8 to neighbors.
Why this is correct
The summary address line under an EIGRP interface confirms that 10.0.0.0/8 is the summarised prefix generated for that interface. EIGRP advertises this aggregate to neighbours rather than the individual component subnets, which is exactly what the output indicates.
- ✗
It redistributes connected routes.
Why it's wrong here
The summary address on an EIGRP interface advertises a manual summary route out of that interface; it does not redistribute connected routes. Redistribution injects routes from other protocols or sources into EIGRP, which would be the right choice when importing static or OSPF routes into the EIGRP domain.
- ✗
It disables split horizon.
Why it's wrong here
The summary address aggregates component routes into 10.0.0.0/8 for advertisement; split horizon is a separate loop-prevention rule, shown enabled in the same output. Disabling split horizon requires the no ip split-horizon eigrp command, used on hub interfaces in DMVPN spokes.
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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