- A
ipv6 address 2001:db8:1:1:0011:22ff:fe33:4455/64 eui-64
Why wrong: This is incorrect because the EUI-64 format requires inserting 'ff:fe' in the middle of the MAC address, but the MAC address is given as 0011.2233.4455, which is in dotted hex format. The correct EUI-64 interface ID should be 0211:22ff:fe33:4455 (with the 7th bit flipped). This option does not flip the 7th bit and uses the wrong format.
- B
ipv6 address 2001:db8:1:1::/64 eui-64
This is correct because the 'ipv6 address ... eui-64' command automatically derives the interface ID from the MAC address using the EUI-64 process. The prefix is specified as 2001:db8:1:1::/64, and the router will generate the full IPv6 address with the correct EUI-64 interface ID.
- C
ipv6 address 2001:db8:1:1:0211:22ff:fe33:4455/64
Why wrong: This is incorrect because the command does not include the 'eui-64' keyword. Without 'eui-64', the router expects a full 128-bit address, but this option provides only a 64-bit prefix followed by an interface ID, which is not a complete address. The router will reject this command.
- D
ipv6 address 2001:db8:1:1::/64 eui-64 0011.2233.4455
Why wrong: This is incorrect because the 'eui-64' keyword does not accept a MAC address as an argument. The router automatically uses the interface's MAC address to derive the interface ID. Specifying a MAC address is not valid syntax.
Quick Answer
The answer is the command `ipv6 address 2001:db8:1:1::/64 eui-64`. This is correct because the `eui-64` keyword instructs the Cisco IOS to automatically derive the 64-bit interface identifier from the interface’s MAC address using the EUI-64 process, which inserts `FFFE` in the middle and flips the seventh bit (the U/L bit). On the CCNA 200-301 v2 exam, this question tests your ability to distinguish between configuring a static full IPv6 address and using the EUI-64 method; a common trap is trying to specify the full 128-bit address with the `eui-64` keyword, which is invalid syntax—the keyword only accepts a prefix. Another trap is omitting the keyword entirely, which results in a static address that does not use EUI-64. To configure an IPv6 EUI-64 address on a Cisco interface, remember the mnemonic: “Prefix plus eui-64, never the full address.”
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. 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.
You are connected to the console of R1. The network uses IPv6 with EUI-64. R1's GigabitEthernet0/0 has MAC address 0011.2233.4455. You need to configure an IPv6 address on this interface using the prefix 2001:db8:1:1::/64 with EUI-64, and ensure the interface is operational.
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
ipv6 address 2001:db8:1:1::/64 eui-64
Option B uses the correct syntax 'ipv6 address 2001:db8:1:1::/64 eui-64', which configures the prefix and derives the interface ID automatically from the MAC address via EUI-64. Option A is invalid because specifying the full 128-bit address with the eui-64 keyword is not allowed; the eui-64 keyword requires only a prefix. Option C omits the eui-64 keyword, so it configures a static address without using EUI-64, which would not match the requirement to use EUI-64. Option D appends the MAC address after the eui-64 keyword, which is invalid syntax; the eui-64 keyword does not accept an explicit MAC address.
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.
- ✗
ipv6 address 2001:db8:1:1:0011:22ff:fe33:4455/64 eui-64
Why it's wrong here
This is incorrect because the EUI-64 format requires inserting 'ff:fe' in the middle of the MAC address, but the MAC address is given as 0011.2233.4455, which is in dotted hex format. The correct EUI-64 interface ID should be 0211:22ff:fe33:4455 (with the 7th bit flipped). This option does not flip the 7th bit and uses the wrong format.
- ✓
ipv6 address 2001:db8:1:1::/64 eui-64
Why this is correct
This is correct because the 'ipv6 address ... eui-64' command automatically derives the interface ID from the MAC address using the EUI-64 process. The prefix is specified as 2001:db8:1:1::/64, and the router will generate the full IPv6 address with the correct EUI-64 interface ID.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
ipv6 address 2001:db8:1:1:0211:22ff:fe33:4455/64
Why it's wrong here
This is incorrect because the command does not include the 'eui-64' keyword. Without 'eui-64', the router expects a full 128-bit address, but this option provides only a 64-bit prefix followed by an interface ID, which is not a complete address. The router will reject this command.
- ✗
ipv6 address 2001:db8:1:1::/64 eui-64 0011.2233.4455
Why it's wrong here
This is incorrect because the 'eui-64' keyword does not accept a MAC address as an argument. The router automatically uses the interface's MAC address to derive the interface ID. Specifying a MAC address is not valid syntax.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓ipv6 address 2001:db8:1:1::/64 eui-64Correct answer▾
Why this is correct
This is correct because the 'ipv6 address ... eui-64' command automatically derives the interface ID from the MAC address using the EUI-64 process. The prefix is specified as 2001:db8:1:1::/64, and the router will generate the full IPv6 address with the correct EUI-64 interface ID.
✗ipv6 address 2001:db8:1:1:0011:22ff:fe33:4455/64 eui-64Wrong answer — click to see why▾
Why this is wrong here
The EUI-64 process requires flipping the U/L bit (7th bit) of the first byte and inserting 'ff:fe' in the middle of the MAC address. This option does not flip the bit.
Why candidates choose this
Candidates may think that simply inserting 'ff:fe' is enough, forgetting to flip the 7th bit.
✗ipv6 address 2001:db8:1:1:0211:22ff:fe33:4455/64Wrong answer — click to see why▾
Why this is wrong here
The 'ipv6 address' command without 'eui-64' requires a full IPv6 address, not a prefix and interface ID.
Why candidates choose this
Candidates may think that specifying the full EUI-64 address manually is equivalent to using the 'eui-64' keyword, but the command syntax is different.
✗ipv6 address 2001:db8:1:1::/64 eui-64 0011.2233.4455Wrong answer — click to see why▾
Why this is wrong here
The 'ipv6 address ... eui-64' command does not take a MAC address parameter; it uses the interface's own MAC address.
Why candidates choose this
Candidates may think they need to provide the MAC address explicitly, similar to other configuration commands that require a MAC address.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Keyword trap
This is incorrect because the command does not include the 'eui-64' keyword. Without 'eui-64', the router expects a full 128-bit address, but this option provides only a 64-bit prefix followed by an interface ID, which is not a complete address. The router will reject this command.
Command / output trap
This is incorrect because the command does not include the 'eui-64' keyword. Without 'eui-64', the router expects a full 128-bit address, but this option provides only a 64-bit prefix followed by an interface ID, which is not a complete address. The router will reject this command.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 200-301 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.
What to study next
Got this wrong? Here's your next step.
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ipv6 address 2001:db8:1:1::/64 eui-64 — Option B uses the correct syntax 'ipv6 address 2001:db8:1:1::/64 eui-64', which configures the prefix and derives the interface ID automatically from the MAC address via EUI-64. Option A is invalid because specifying the full 128-bit address with the eui-64 keyword is not allowed; the eui-64 keyword requires only a prefix. Option C omits the eui-64 keyword, so it configures a static address without using EUI-64, which would not match the requirement to use EUI-64. Option D appends the MAC address after the eui-64 keyword, which is invalid syntax; the eui-64 keyword does not accept an explicit MAC address.
What should I do if I get this 200-301 question wrong?
Identify which 200-301 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 7, 2026
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