- A
R1(config-if)# ipv6 enable R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdown
The ipv6 enable command automatically generates a link-local address using EUI-64 based on the MAC address. The ipv6 address 2001:db8:1::/64 eui-64 command configures the global unicast address with EUI-64. The no shutdown command brings the interface up.
- B
R1(config-if)# ipv6 address fe80::/10 eui-64 R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdown
Why wrong: This is incorrect because the link-local address cannot be manually configured with the eui-64 keyword in this manner; it is automatically generated by the ipv6 enable command. The command ipv6 address fe80::/10 eui-64 is not valid for link-local addresses.
- C
R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdown
Why wrong: This is incorrect because without the ipv6 enable command, the interface will not generate a link-local address, which is required for IPv6 operation. The global unicast address alone does not enable IPv6 on the interface.
- D
R1(config-if)# ipv6 enable R1(config-if)# ipv6 address 2001:db8:1::1/64 R1(config-if)# no shutdown
Why wrong: This is incorrect because the global unicast address is configured with a static interface ID (::1) instead of using EUI-64 as required by the question. The question specifies the use of EUI-64 for the global unicast address.
Quick Answer
The correct configuration is to enter interface configuration mode and issue the commands ipv6 enable, ipv6 address 2001:db8:1::/64 eui-64, and no shutdown. The ipv6 enable command explicitly generates an IPv6 link-local address from the MAC address 0011.2233.4455, which is required when no other IPv6 address has been assigned yet. The eui-64 keyword on the global unicast address automatically derives the 64-bit interface identifier from that same MAC address, inserting FFFE in the middle and flipping the U/L bit. On the CCNA 200-301 v2 exam, this tests your understanding that EUI-64 is a stateless address autoconfiguration method, and a common trap is trying to manually configure a link-local address with eui-64, which is invalid because link-local addresses are always derived automatically. Remember the three-step recipe: enable the link-local, assign the global with eui-64, then no shutdown—or as a quick mnemonic, “Enable, EUI, Enable the interface.”
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 interface has MAC address 0011.2233.4455. You must configure the interface to generate an IPv6 link-local address using the 'ipv6 enable' command, and also assign a global unicast address 2001:db8:1::/64 using EUI-64. The interface is currently administratively down.
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
R1(config-if)# ipv6 enable R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdown
The ipv6 enable command explicitly creates a link-local address as required by the scenario. The global unicast address with the eui-64 keyword automatically derives the interface ID from the MAC address. Option B is incorrect because it tries to manually configure a link-local address with eui-64, which is unnecessary and invalid. Option C omits the ipv6 enable command, failing the explicit requirement. Option D assigns a static host portion instead of using eui-64.
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.
- ✓
R1(config-if)# ipv6 enable R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdown
Why this is correct
The ipv6 enable command automatically generates a link-local address using EUI-64 based on the MAC address. The ipv6 address 2001:db8:1::/64 eui-64 command configures the global unicast address with EUI-64. The no shutdown command brings the interface up.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
R1(config-if)# ipv6 address fe80::/10 eui-64 R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdown
Why it's wrong here
This is incorrect because the link-local address cannot be manually configured with the eui-64 keyword in this manner; it is automatically generated by the ipv6 enable command. The command ipv6 address fe80::/10 eui-64 is not valid for link-local addresses.
- ✗
R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdown
Why it's wrong here
This is incorrect because without the ipv6 enable command, the interface will not generate a link-local address, which is required for IPv6 operation. The global unicast address alone does not enable IPv6 on the interface.
- ✗
R1(config-if)# ipv6 enable R1(config-if)# ipv6 address 2001:db8:1::1/64 R1(config-if)# no shutdown
Why it's wrong here
This is incorrect because the global unicast address is configured with a static interface ID (::1) instead of using EUI-64 as required by the question. The question specifies the use of EUI-64 for the global unicast address.
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.
✓R1(config-if)# ipv6 enable R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdownCorrect answer▾
Why this is correct
The ipv6 enable command automatically generates a link-local address using EUI-64 based on the MAC address. The ipv6 address 2001:db8:1::/64 eui-64 command configures the global unicast address with EUI-64. The no shutdown command brings the interface up.
✗R1(config-if)# ipv6 address fe80::/10 eui-64 R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdownWrong answer — click to see why▾
Why this is wrong here
The specific factual error: Link-local addresses are automatically generated using EUI-64 when ipv6 enable is issued; they cannot be manually configured with the eui-64 keyword.
Why candidates choose this
Candidates might think they need to explicitly configure the link-local address with EUI-64, similar to the global unicast address.
✗R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdownWrong answer — click to see why▾
Why this is wrong here
Does not use the ipv6 enable command as required to generate the link-local address.
Why candidates choose this
Candidates might assume that configuring a global unicast address automatically enables IPv6 and generates a link-local address, but that is not the case.
✗R1(config-if)# ipv6 enable R1(config-if)# ipv6 address 2001:db8:1::1/64 R1(config-if)# no shutdownWrong answer — click to see why▾
Why this is wrong here
The specific factual error: The command ipv6 address 2001:db8:1::1/64 assigns a static IPv6 address, not an EUI-64 derived address.
Why candidates choose this
Candidates might think that manually specifying the interface ID is acceptable, but the question explicitly requires EUI-64.
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 link-local address cannot be manually configured with the eui-64 keyword in this manner; it is automatically generated by the ipv6 enable command. The command ipv6 address fe80::/10 eui-64 is not valid for link-local addresses.
Command / output trap
This is incorrect because the link-local address cannot be manually configured with the eui-64 keyword in this manner; it is automatically generated by the ipv6 enable command. The command ipv6 address fe80::/10 eui-64 is not valid for link-local addresses.
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: R1(config-if)# ipv6 enable R1(config-if)# ipv6 address 2001:db8:1::/64 eui-64 R1(config-if)# no shutdown — The ipv6 enable command explicitly creates a link-local address as required by the scenario. The global unicast address with the eui-64 keyword automatically derives the interface ID from the MAC address. Option B is incorrect because it tries to manually configure a link-local address with eui-64, which is unnecessary and invalid. Option C omits the ipv6 enable command, failing the explicit requirement. Option D assigns a static host portion instead of using eui-64.
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 →
Same concept, more angles
1 more ways this is tested on 200-301
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You are connected to the console of R1. The network uses IPv6 with EUI-64. R1's GigabitEthernet0/0 interface has MAC address 001e.4a7b.9c0d. You need to configure an IPv6 address on this interface using EUI-64, with the subnet 2001:db8:abcd:1::/64.
hard- ✓ A.ipv6 address 2001:db8:abcd:1::/64 eui-64
- B.ipv6 address 2001:db8:abcd:1::/64
- C.ipv6 address 2001:db8:abcd:1::/64 link-local
- D.ipv6 enable
Why A: The 'ipv6 address 2001:db8:abcd:1::/64 eui-64' command configures the IPv6 address using EUI-64, which generates the interface ID from the MAC address. This command alone enables IPv6 on the interface and assigns the global address; the 'ipv6 enable' command is not strictly necessary and is only required if a link-local address is needed without a global address. Option B would configure a static interface ID, not EUI-64. Option C incorrectly uses the 'link-local' keyword, which is not valid in this context. Option D only enables IPv6 for link-local addressing without assigning a global unicast address.
Last reviewed: Jun 7, 2026
This 200-301 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 200-301 exam.
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