Question 721 of 2,152

IPv6 Tunneling Techniques →hardMultiple ChoiceObjective-mapped

300-410 IPv6 Tunneling Techniques Practice Question

This 300-410 practice question tests your understanding of ipv6 tunneling techniques. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

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?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1hardmultiple choice

Study the full EIGRP explanation →

A
EIGRP for IPv6 requires the 'no shutdown' command under the address-family; without it, the process is administratively down.
Unlike EIGRP for IPv4, EIGRP for IPv6 has a shutdown state by default. The 'no shutdown' command is required to activate the address-family.
B
The tunnel interface is not configured with 'ipv6 eigrp' under the interface.
Why wrong: The question states the interface is included in the EIGRP process, so this is not the issue.
C
The IPsec transform set does not allow multicast traffic, which EIGRP uses for hellos.
Why wrong: IPsec can encrypt multicast traffic; EIGRP hellos are sent to the multicast address FF02::A, which is encapsulated in the tunnel.
D
The GRE tunnel does not support EIGRP for IPv6; only OSPFv3 is supported.
Why wrong: GRE tunnels support any Layer 3 protocol, including EIGRP for IPv6.

Full breakdown with real-world context →

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.

Option A is correct because 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'.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.

Common exam traps

Common exam trap: answer the scenario, not the keyword

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.

Detailed technical explanation

How to think about this question

EIGRP for IPv6 uses a separate address-family configuration mode where the 'no shutdown' command is mandatory to enable the process, unlike EIGRP for IPv4 which is enabled by default. The neighbor relationship forms because EIGRP hellos are multicast to FF02::A, which are encapsulated and sent over the tunnel, but without the process being active, the router discards any received updates and does not originate its own routes. This behavior is defined in RFC 7868 and is a common pitfall when migrating from IPv4 to IPv6 EIGRP configurations.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 300-410 question test?

IPv6 Tunneling Techniques — This question tests IPv6 Tunneling Techniques — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: EIGRP for IPv6 requires the 'no shutdown' command under the address-family; without it, the process is administratively down. — Option A is correct because 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'.

What should I do if I get this 300-410 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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