- A
APIPA assigns an IPv4 address in the 169.254.0.0/16 range when a DHCP server is unavailable.
APIPA (Automatic Private IP Addressing) automatically assigns an address from 169.254.0.0/16 when DHCP fails, allowing local communication without a DHCP server.
- B
IPv6 link-local addresses are always assigned using EUI-64 and start with FE80::/10.
Why wrong: IPv6 link-local addresses do start with FE80::/10, but they are not always assigned using EUI-64; they can also be randomly generated or manually configured.
- C
EUI-64 is used to generate the network prefix of an IPv6 address from the interface's MAC address.
Why wrong: EUI-64 generates the interface ID (host portion) of an IPv6 address, not the network prefix.
- D
A host can have only one default gateway configured at a time for both IPv4 and IPv6.
Why wrong: A host can have multiple default gateways configured, though only one is typically active at a time based on metrics or priorities.
- E
The ipconfig command on Windows can display both IPv4 and IPv6 addresses, subnet masks, default gateways, and DNS servers.
ipconfig is a Windows command that shows IPv4 and IPv6 configuration details, including subnet masks, default gateways, and DNS servers.
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.
Which TWO statements correctly describe IPv4 and IPv6 host configuration?
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
APIPA assigns an IPv4 address in the 169.254.0.0/16 range when a DHCP server is unavailable.
Option A is correct because APIPA (Automatic Private IP Addressing) automatically assigns an IPv4 address from the 169.254.0.0/16 range when a DHCP server is unavailable, enabling local subnet communication without manual configuration. Option E is correct because the ipconfig command on Windows displays both IPv4 and IPv6 addresses, subnet masks, default gateways, and DNS servers. Option B is incorrect because while IPv6 link-local addresses start with FE80::/10, they are not always assigned using EUI-64; they can also be randomly generated (privacy extensions) or manually configured. Option C is incorrect because EUI-64 generates the interface identifier (host portion) of an IPv6 address from the MAC address, not the network prefix — the prefix is provided via SLAAC, DHCPv6, or manual configuration. Option D is incorrect because a host can have multiple default gateways configured for redundancy, though only one is active at a time per routing table; additionally, IPv4 and IPv6 default gateways are independent and can coexist.
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.
- ✓
APIPA assigns an IPv4 address in the 169.254.0.0/16 range when a DHCP server is unavailable.
Why this is correct
APIPA (Automatic Private IP Addressing) automatically assigns an address from 169.254.0.0/16 when DHCP fails, allowing local communication without a DHCP server.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
IPv6 link-local addresses are always assigned using EUI-64 and start with FE80::/10.
- ✗
EUI-64 is used to generate the network prefix of an IPv6 address from the interface's MAC address.
Why it's wrong here
EUI-64 generates the interface ID (host portion) of an IPv6 address, not the network prefix.
- ✗
A host can have only one default gateway configured at a time for both IPv4 and IPv6.
Why it's wrong here
A host can have multiple default gateways configured, though only one is typically active at a time based on metrics or priorities.
- ✓
The ipconfig command on Windows can display both IPv4 and IPv6 addresses, subnet masks, default gateways, and DNS servers.
Why this is correct
ipconfig is a Windows command that shows IPv4 and IPv6 configuration details, including subnet masks, default gateways, and DNS servers.
Related concept
Read the scenario before looking for a memorised answer.
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.
✓APIPA assigns an IPv4 address in the 169.254.0.0/16 range when a DHCP server is unavailable.Correct answer▾
Why this is correct
APIPA (Automatic Private IP Addressing) automatically assigns an address from 169.254.0.0/16 when DHCP fails, allowing local communication without a DHCP server.
✗IPv6 link-local addresses are always assigned using EUI-64 and start with FE80::/10.Wrong answer — click to see why▾
Why this is wrong here
The statement incorrectly claims that link-local addresses are always assigned using EUI-64.
✗EUI-64 is used to generate the network prefix of an IPv6 address from the interface's MAC address.Wrong answer — click to see why▾
Why this is wrong here
The statement confuses the role of EUI-64; it creates the interface ID, not the network prefix.
✗A host can have only one default gateway configured at a time for both IPv4 and IPv6.Wrong answer — click to see why▾
Why this is wrong here
The statement is too restrictive; multiple default gateways can be configured, especially in multi-homed hosts.
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
Cisco often tests the misconception that EUI-64 generates the network prefix of an IPv6 address, when in fact it generates only the interface identifier (host portion), while the network prefix is assigned via SLAAC, DHCPv6, or manual configuration.
Detailed technical explanation
How to think about this question
APIPA uses a link-local address block (169.254.0.0/16) and performs a gratuitous ARP probe to ensure uniqueness before assigning the address. In IPv6, link-local addresses are mandatory on every interface and are used for neighbor discovery and other local communication, but they are never routed beyond the local link. The EUI-64 process inserts FFFE in the middle of the MAC address and flips the U/L bit to create a 64-bit interface identifier.
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 segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
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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: APIPA assigns an IPv4 address in the 169.254.0.0/16 range when a DHCP server is unavailable. — Option A is correct because APIPA (Automatic Private IP Addressing) automatically assigns an IPv4 address from the 169.254.0.0/16 range when a DHCP server is unavailable, enabling local subnet communication without manual configuration. Option E is correct because the ipconfig command on Windows displays both IPv4 and IPv6 addresses, subnet masks, default gateways, and DNS servers. Option B is incorrect because while IPv6 link-local addresses start with FE80::/10, they are not always assigned using EUI-64; they can also be randomly generated (privacy extensions) or manually configured. Option C is incorrect because EUI-64 generates the interface identifier (host portion) of an IPv6 address from the MAC address, not the network prefix — the prefix is provided via SLAAC, DHCPv6, or manual configuration. Option D is incorrect because a host can have multiple default gateways configured for redundancy, though only one is active at a time per routing table; additionally, IPv4 and IPv6 default gateways are independent and can coexist.
What should I do if I get this 200-301 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.
About these practice questions
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Last reviewed: Jun 11, 2026
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