300-410 Layer 3 Technologies Practice Question
A network engineer is configuring EIGRP for IPv6 on a Cisco IOS XE router. The router has two interfaces: GigabitEthernet0/0 (2001:DB8:1::1/64) and GigabitEthernet0/1 (2001:DB8:2::1/64). The engineer wants to enable EIGRP for IPv6 on both interfaces and ensure that the router forms adjacencies. Which configuration is required?
⚠ Common exam trap
The trap here is assuming EIGRP for IPv6 uses the network command like IPv4 EIGRP; it does not, and interfaces must be enabled individually.
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 globally, create an EIGRP for IPv6 routing process, and enable EIGRP on each interface with the ipv6 eigrp command.
EIGRP for IPv6 requires IPv6 unicast routing to be enabled globally, creation of an EIGRP for IPv6 routing process, and explicit enabling of EIGRP on each interface using the ipv6 eigrp command. Unlike IPv4 EIGRP, there is no network command; interfaces must be enabled individually. This ensures the router can form adjacencies and exchange IPv6 routing information.
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 globally, configure an EIGRP for IPv6 routing process, and use the network command under the routing process to advertise the interfaces.
Why it's wrong here
EIGRP for IPv6 does not use the network command to enable interfaces. Unlike EIGRP for IPv4, where network statements activate EIGRP on matching interfaces, EIGRP for IPv6 requires interface-level configuration with ipv6 eigrp. Using network commands under the IPv6 routing process is not supported and will not enable EIGRP on the interfaces.
- ✓
Enable IPv6 unicast routing globally, create an EIGRP for IPv6 routing process, and enable EIGRP on each interface with the ipv6 eigrp command.
Why this is correct
EIGRP for IPv6 requires IPv6 unicast routing to be enabled globally. The routing process is created with ipv6 router eigrp AS number, and then EIGRP must be enabled on each interface using ipv6 eigrp AS number. This allows the interfaces to participate in EIGRP for IPv6 and form adjacencies with neighbors.
- ✗
Enable IPv6 unicast routing globally, configure EIGRP for IPv6 with the no shutdown command under the routing process, and assign IPv6 addresses to interfaces.
Why it's wrong here
While the no shutdown command is necessary to activate the EIGRP for IPv6 routing process, it is not sufficient. The interfaces must also be enabled for EIGRP for IPv6 with the ipv6 eigrp command. Simply configuring the routing process and assigning addresses does not activate EIGRP on the interfaces, so adjacencies will not form.
- ✗
Enable IPv6 unicast routing globally, configure EIGRP for IPv6, and enable EIGRP on interfaces using the ipv6 router eigrp command under each interface.
Why it's wrong here
The ipv6 router eigrp command is used in global configuration mode to create the EIGRP for IPv6 routing process, not under an interface. Under an interface, the correct command is ipv6 eigrp AS number. Using the wrong command syntax will not enable EIGRP on the interface, and adjacencies will not form.
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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JA
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
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.