mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot OSPF…
A network engineer runs the following command to troubleshoot OSPF route installation:
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
O 10.1.1.0/24 [110/10] via 10.1.1.2, 00:12:34, GigabitEthernet0/0
O IA 192.168.1.0/24 [110/20] via 10.1.1.2, 00:10:00, GigabitEthernet0/0 O E2 5.5.5.5/32 [110/20] via 10.1.1.2, 00:05:00, GigabitEthernet0/0
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
✓
All OSPF routes are learned from the same next-hop 10.1.1.2.
The output shows OSPF routes in the routing table, including intra-area, inter-area, and external 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.
- ✓
All OSPF routes are learned from the same next-hop 10.1.1.2.
Why this is correct
All three OSPF routes have the same next-hop address 10.1.1.2.
- ✗
The route to 5.5.5.5/32 is an intra-area route.
Why it's wrong here
The code 'O E2' indicates an external type 2 route.
- ✗
The route to 192.168.1.0/24 is a directly connected network.
Why it's wrong here
The code 'O IA' indicates an OSPF inter-area route.
- ✗
The router has a default route installed.
Why it's wrong here
The output shows 'Gateway of last resort is not set', meaning no default route.
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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Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
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.
Key term
DMVPN Phase 2
DMVPN Phase 2 is an advanced Cisco routing technology that allows spoke routers to communicate directly with one another without sending traffic through a central hub, using dynamic routing protocols and multipoint GRE tunnels.
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