The correct answer is that ISATAP embeds the IPv4 address into the interface identifier (the last 64 bits) of the IPv6 address. This ISATAP tunneling addressing mechanism works by taking the host’s existing 32-bit IPv4 address and inserting it directly into the lower 64 bits of the 128-bit IPv6 address, typically using the format ::0200:5EFE:IPv4-address, which allows automatic IPv6 address generation without manual configuration. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of transition technologies and how hosts dynamically derive their IPv6 address from a known IPv4 source; a common trap is confusing ISATAP with 6to4, which embeds the IPv4 address in the network prefix rather than the interface ID. Remember the memory tip: “ISATAP puts the IPv4 in the IID” — the Interface Identifier is where the IPv4 address lives, not the prefix.
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.
Which statement correctly describes the behavior of ISATAP tunneling regarding host configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ISATAP embeds the IPv4 address into the interface identifier (last 64 bits) of the IPv6 address.
ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) automatically generates the IPv6 address by embedding the host's IPv4 address into the interface identifier (the last 64 bits of the IPv6 address). This allows hosts to obtain a complete IPv6 address without manual configuration of the full 128-bit address, as the IPv4 address is used to form the unique interface ID. Option C correctly describes this behavior.
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.
✗
ISATAP requires manual configuration of the entire IPv6 address on each host.
Why it's wrong here
ISATAP automates address configuration using the embedded IPv4 address.
✗
ISATAP uses the prefix 2002::/16 for global addresses.
Why it's wrong here
2002::/16 is used by 6to4, not ISATAP.
✓
ISATAP embeds the IPv4 address into the interface identifier (last 64 bits) of the IPv6 address.
Why this is correct
ISATAP uses the format ::5EFE:IPv4-address for the interface identifier.
Related concept
Read the scenario before looking for a memorised answer.
✗
ISATAP is only used for site-to-site tunnels.
Why it's wrong here
ISATAP is designed for intra-site communication, not site-to-site.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between ISATAP and 6to4 tunneling, and the trap here is confusing the 2002::/16 prefix (used by 6to4) with ISATAP's use of a site-specific prefix and the embedded IPv4 address in the interface ID.
Detailed technical explanation
How to think about this question
ISATAP uses a modified EUI-64 format where the interface identifier is constructed as 0000:5EFE:<IPv4 address>, with the IPv4 address placed in the last 32 bits. The 5EFE (or 5EFE in some implementations) acts as a well-known identifier indicating an ISATAP address. This mechanism allows hosts on an IPv4 network to communicate with IPv6 networks without requiring a full IPv6 infrastructure, as the ISATAP router provides the IPv6 prefix and acts as a gateway.
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 practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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: ISATAP embeds the IPv4 address into the interface identifier (last 64 bits) of the IPv6 address. — ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) automatically generates the IPv6 address by embedding the host's IPv4 address into the interface identifier (the last 64 bits of the IPv6 address). This allows hosts to obtain a complete IPv6 address without manual configuration of the full 128-bit address, as the IPv4 address is used to form the unique interface ID. Option C correctly describes this behavior.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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