- A
IPv6 address: 128-bit identifier for network interfaces
This is correct because global unicast addresses are globally unique and routable on the internet, similar to public IPv4 addresses.
- B
Global unicast address: Publicly routable IPv6 address similar to public IPv4
This is incorrect because link-local addresses are not routable; they are only used for communication on a single network segment.
- C
Link-local address: Automatically assigned address used for communication within a single network segment
This is incorrect because unique local addresses are private and not routable on the internet; they are intended for internal use within an organization.
- D
Unique local address: Private IPv6 address analogous to RFC 1918 IPv4 addresses
This is incorrect because anycast addresses send packets to the nearest interface in the group, not all interfaces simultaneously.
Quick Answer
The correct answer is that a Global Unicast address is a publicly routable IPv6 address similar to public IPv4. This is correct because Global Unicast addresses, identified by the 2000::/3 prefix, are designed for end-to-end communication across the internet, just like public IPv4 addresses, whereas Link-Local addresses (fe80::/10) are confined to a single network segment and Unique Local addresses (fc00::/7) are private and non-routable on the global internet. On the CCNA 200-301 v2 exam, this distinction tests your ability to differentiate IPv6 address types by scope and routability, often appearing in matching or multiple-choice questions where a common trap is confusing Unique Local with Global Unicast due to their similar “private vs. public” roles. A reliable memory tip is to think “Global goes global” for internet routing, while “Link-Local stays local” and “Unique Local is unique to your site.”
CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: a global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.. 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.
Match each IPv6 concept to its most accurate description.
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: 128-bit identifier for network interfaces
These pairings accurately define key IPv6 concepts.
Key principle: A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.
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: 128-bit identifier for network interfaces
Why this is correct
This is correct because global unicast addresses are globally unique and routable on the internet, similar to public IPv4 addresses.
Related concept
A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.
- ✓
Global unicast address: Publicly routable IPv6 address similar to public IPv4
Why this is correct
This is incorrect because link-local addresses are not routable; they are only used for communication on a single network segment.
Related concept
A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.
- ✓
Link-local address: Automatically assigned address used for communication within a single network segment
Why this is correct
This is incorrect because unique local addresses are private and not routable on the internet; they are intended for internal use within an organization.
Related concept
A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.
- ✓
Unique local address: Private IPv6 address analogous to RFC 1918 IPv4 addresses
Why this is correct
This is incorrect because anycast addresses send packets to the nearest interface in the group, not all interfaces simultaneously.
Related concept
A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Be careful not to confuse the scope of IPv6 address types. Link-local addresses are not routable, unique local addresses are private, and anycast is one-to-nearest, not one-to-many. Remember that 'local' in link-local means the link, not the site.
Detailed technical explanation
How to think about this question
IPv6 introduces several key concepts that differ significantly from IPv4, including address types, configuration methods, and routing protocols. A global unicast address in IPv6 is a unique address assigned to a device that can be routed across the internet or large-scale networks, similar to a public IPv4 address. In contrast, a link-local address is automatically assigned to an interface and is only valid within the local network segment; it cannot be routed beyond that link. This distinction is fundamental for understanding IPv6 addressing and communication scope. Stateless Address Autoconfiguration (SLAAC) is a mechanism that allows IPv6 hosts to configure their own addresses automatically without requiring a DHCP server. SLAAC uses Router Advertisement messages sent by routers to inform hosts about network prefixes and other configuration parameters. This method simplifies host configuration and supports plug-and-play networking. Meanwhile, OSPFv3 is the version of the OSPF routing protocol designed to support IPv6 networks. Unlike SLAAC, OSPFv3 manages routing information and path selection rather than host address configuration. A frequent source of confusion in Cisco CCNA exams is mixing these concepts due to their simultaneous appearance in IPv6 scenarios. For example, candidates might incorrectly associate SLAAC with routing or think that link-local addresses can be used for global communication. Understanding that address scope (global unicast vs. link-local), configuration method (SLAAC), and routing protocol (OSPFv3) serve distinct roles helps avoid these pitfalls. Practically, Cisco devices use link-local addresses for routing protocol neighbor discovery and management traffic, while SLAAC and global unicast addresses enable broader network communication.
KKey Concepts to Remember
- A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.
- An IPv6 link-local address is automatically assigned and only valid within the local network segment, preventing routing beyond the link.
- SLAAC allows IPv6 hosts to self-configure their addresses using router advertisements without requiring DHCP servers.
- OSPFv3 is the IPv6-compatible version of the OSPF routing protocol that manages routing tables and path selection in IPv6 networks.
- IPv6 address types and configuration methods serve distinct roles and should not be confused during CCNA exam scenarios.
- Link-local addresses are essential for IPv6 routing protocol operations like neighbor discovery but are not used for global communication.
- Router advertisements in SLAAC provide prefix information enabling hosts to generate their own global unicast addresses.
- OSPFv3 uses link-local addresses for neighbor relationships but routes global unicast addresses for end-to-end communication.
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
A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.
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. A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks. 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.
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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 — A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks..
What is the correct answer to this question?
The correct answer is: IPv6 address: 128-bit identifier for network interfaces — These pairings accurately define key IPv6 concepts.
What should I do if I get this 200-301 question wrong?
Review a global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
A global unicast IPv6 address is assigned to a device for routable communication across the internet or large networks.
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. Which two statements accurately describe IPv6 link-local addresses?
medium- ✓ A.They are used for communication on the local segment only.
- B.They are globally routable across the Internet.
- ✓ C.They are commonly involved in local IPv6 neighbor interactions.
- D.They exist only when DHCPv6 fails.
- E.They replace the need for any default gateway logic.
Why A: IPv6 link-local addresses are designed for communication on the local segment only. In plain language, they allow devices to talk to nearby neighbors without needing globally routable addresses. They play an important role in IPv6 functions such as Neighbor Discovery and are commonly used when hosts communicate with the default gateway on the same link. These addresses are normal and expected in IPv6 environments. They are not globally Internet-routable, and they are not just emergency fallbacks for DHCPv6 failure. The two correct answers are the ones that preserve their local-link purpose and their importance in standard IPv6 behavior rather than treating them as optional or globally reachable.
Last reviewed: Apr 12, 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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