hardMultiple 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 vrf BLUE
Codes: 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, 3 subnets, 2 masks C 10.1.1.0/24 is directly connected, GigabitEthernet0/0 C 10.1.2.0/24 is directly connected, GigabitEthernet0/1 O 10.2.0.0/16 [110/20] via 10.1.1.2, 00:00:15, GigabitEthernet0/0
Based on this output, what is the problem?
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 output is normal; no problem is indicated.
The output shows a normal VRF routing table. It contains two directly connected routes (10.1.1.0/24 and 10.1.2.0/24) and one OSPF route (10.2.0.0/16) via next hop 10.1.1.2, which is reachable through GigabitEthernet0/0. The route age of 00:00:15 indicates the OSPF route was installed 15 seconds ago, but that alone is not evidence of a flap; a route can be recently installed after an adjacency forms or after a normal topology change. The absence of a default route is not inherently a problem. Therefore, no problem is indicated by this output.
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 OSPF route 10.2.0.0/16 has a next hop of 10.1.1.2, which is unreachable.
Why it's wrong here
The next hop is reachable via the connected interface GigabitEthernet0/0.
- ✓
The output is normal; no problem is indicated.
Why this is correct
The age of 00:00:15 suggests the route was recently installed, which could indicate a flapping OSPF neighbor or route instability.
- ✗
The VRF BLUE has no default route, which is a problem.
Why it's wrong here
Not having a default route is not necessarily a problem; it depends on the design.
- ✗
The connected routes are not in the routing table.
Why it's wrong here
They are present as shown.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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