easyMultiple 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 route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks O 10.1.1.0/24 [110/20] via 192.168.1.2, 00:15:30, GigabitEthernet0/0 O 10.2.2.0/24 [110/30] via 192.168.1.2, 00:15:30, GigabitEthernet0/0
Based on this output, which statement is correct?
⚠ Common exam trap
300-410 often tests whether candidates can read the [AD/metric] bracket correctly and distinguish OSPF route codes, tempting them to misread the metric or assume a default route exists.
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 two OSPF routes to different subnets.
The output shows two OSPF-learned routes: 10.1.1.0/24 with metric 20 and 10.2.2.0/24 with metric 30, both via 192.168.1.2 on GigabitEthernet0/0. These are two distinct OSPF routes to different subnets, which matches option B. The 'O' code confirms intra-area OSPF routes, and the timers (00:15:30) indicate the routes have been stable for over 15 minutes.
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 a default route via OSPF.
Why it's wrong here
The output states "Gateway of last resort is not set", and no 0.0.0.0/0 entry appears, so no default route exists via OSPF or otherwise. A default would display as O*E2 or similar. It tempts because OSPF can advertise a default via default-information originate, but that was not configured here.
- ✓
The router has two OSPF routes to different subnets.
Why this is correct
The output lists two OSPF entries, 10.1.1.0/24 and 10.2.2.0/24, each with a distinct destination prefix, confirming separate subnets. Both were learned via 192.168.1.2 on GigabitEthernet0/0, with administrative distance 110 and metrics 20 and 30 respectively. This satisfies the stem's requirement of two OSPF routes to different subnets.
- ✗
The OSPF neighbor is down.
Why it's wrong here
Routes learned via 192.168.1.2 with recent timers and valid AD 110 prove the adjacency formed and is exchanging LSAs, so the neighbour is up. The down state would show no OSPF routes or stale entries. It tempts because a missing neighbour can explain absent routes, but here routes exist, so the premise is contradicted.
- ✗
The metric for 10.2.2.0/24 is 20.
Why it's wrong here
The bracketed value [110/30] shows administrative distance 110 and metric 30 for 10.2.2.0/24; 20 belongs to 10.1.1.0/24. Reading the first number as the metric confuses distance with cost. It tempts because both values sit in the same brackets, but the metric is always the second figure.
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
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Key term
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Key term
OSPF Special Area Types
OSPF special area types are configurations within an OSPF network that limit the type of routing information shared across an area to reduce routing table size and processing overhead.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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