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300-410 Practice Question: Configures an IPv6 over IPv4 GRE tunnel with…
A network engineer configures an IPv6 over IPv4 GRE tunnel with IPsec protection. The tunnel works for IPv6 traffic, but when the engineer tries to run EIGRP for IPv6 over the tunnel, the neighbor relationship forms but routes are not exchanged. The engineer checks the EIGRP configuration and sees that the tunnel interface is included in the EIGRP process. What is the most likely explanation?
⚠ Common exam trap
Cisco often tests the 'no shutdown' requirement for EIGRP for IPv6, tricking candidates who assume the process is automatically enabled once configured, similar to EIGRP for IPv4.
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
✓
EIGRP for IPv6 requires the 'no shutdown' command under the address-family; without it, the process is administratively down.
EIGRP for IPv6 requires the 'no shutdown' command under the address-family configuration to activate the routing process. Without it, the EIGRP process remains administratively down, which prevents route exchange even though the neighbor relationship forms (since EIGRP hellos are sent but routes are not advertised or processed). This is a common misconfiguration when transitioning from EIGRP for IPv4, which does not require an explicit 'no shutdown'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
EIGRP for IPv6 requires the 'no shutdown' command under the address-family; without it, the process is administratively down.
Why this is correct
Unlike EIGRP for IPv4, EIGRP for IPv6 has a shutdown state by default. The 'no shutdown' command is required to activate the address-family.
- ✗
The tunnel interface is not configured with 'ipv6 eigrp' under the interface.
Why it's wrong here
The question states the interface is included in the EIGRP process, so this is not the issue.
- ✗
The IPsec transform set does not allow multicast traffic, which EIGRP uses for hellos.
Why it's wrong here
IPsec can encrypt multicast traffic; EIGRP hellos are sent to the multicast address FF02::A, which is encapsulated in the tunnel.
- ✗
The GRE tunnel does not support EIGRP for IPv6; only OSPFv3 is supported.
Why it's wrong here
GRE tunnels support any Layer 3 protocol, including EIGRP for IPv6.
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 by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.