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300-410 Practice Question: Which TWO configuration steps are required to…
Which TWO configuration steps are required to enable OSPFv3 on a Cisco IOS router for IPv6 routing? (Choose TWO.)
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
✓
Enable IPv6 unicast routing with 'ipv6 unicast-routing' globally.
You must first enable IPv6 unicast routing globally, then configure the OSPFv3 process and enable it on the interface. The 'network' command is OSPFv2; OSPFv3 uses 'ipv6 ospf' under the interface. The router-id is optional but recommended. The 'ipv6 router ospf' command creates the process.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable IPv6 unicast routing with 'ipv6 unicast-routing' globally.
Why this is correct
This is required for any IPv6 routing, including OSPFv3.
- ✗
Use the 'network' command under the OSPFv3 process to specify interfaces.
Why it's wrong here
OSPFv3 does not use the 'network' command; it uses interface-level configuration.
- ✓
Configure the OSPFv3 process using 'ipv6 router ospf <process-id>'.
Why this is correct
This creates the OSPFv3 routing process.
- ✗
Assign a router-id using 'router-id <A.B.C.D>' under the OSPFv3 process.
Why it's wrong here
While recommended, this is not strictly required; OSPFv3 can use an IPv4 address from a loopback.
- ✗
Enable OSPFv3 on the interface using 'ip ospf <process-id> area <area-id>'.
Why it's wrong here
This is OSPFv2 syntax; OSPFv3 uses 'ipv6 ospf <process-id> area <area-id>'.
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
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
IPv6 Next Hop Resolution
IPv6 Next Hop Resolution is the process a router uses to determine the next router or destination device to which a packet should be forwarded, based on the destination IPv6 address and the routing table.
Key term
IPv6 Routing OSPFv3
OSPFv3 is a routing protocol that lets routers share information about how to reach destinations in an IPv6 network, updating routes automatically as the network changes.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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