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 uniquely identifies an interface and is routable across different IPv6 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.
Which statement best describes a global unicast IPv6 address?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It is the normal IPv6 address type used for routed communication across networks.
A global unicast IPv6 address is the normal IPv6 address type used for routed communication across networks. In practical terms, it plays the role that a normal public unicast IPv4 address plays in routed IPv4 communication. Unlike a link-local address, it is not limited to the local segment only.
This question tests whether you can separate IPv6 address scope correctly. The common mistake is to confuse global unicast with link-local or loopback addressing.
Key principle: A global unicast IPv6 address uniquely identifies an interface and is routable across different IPv6 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.
✓
It is the normal IPv6 address type used for routed communication across networks.
Why this is correct
This is correct because global unicast addresses are used for wider routed IPv6 communication.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
A global unicast IPv6 address uniquely identifies an interface and is routable across different IPv6 networks.
✗
It can be used only on the local link and is never routed.
Why it's wrong here
This is wrong because that describes link-local scope.
When this WOULD be correct
If the question asked about link-local IPv6 addresses specifically, then option B would be correct, as link-local addresses are indeed used only on the local link and are not routable beyond that scope.
✗
It is used only for loopback testing inside a device.
Why it's wrong here
This is wrong because that describes the loopback address, not global unicast.
When this WOULD be correct
If the exam question asked about the purpose of the IPv6 loopback address specifically, stating that it is used only for loopback testing inside a device would be correct. For example, a question could ask, 'What is the function of the IPv6 address ::1?'
✗
It is created only when EUI-64 is disabled.
Why it's wrong here
This is wrong because global unicast addressing is not dependent on that condition.
When this WOULD be correct
In a question that asks specifically about the address creation process in IPv6, stating that a global unicast address is created only when EUI-64 is disabled could be correct if the context is about a specific configuration scenario where EUI-64 is indeed disabled, leading to a different address generation method.
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.
✓It is the normal IPv6 address type used for routed communication across networks.Correct answer▾
Why this is correct
This is correct because global unicast addresses are used for wider routed IPv6 communication.
✗It can be used only on the local link and is never routed.Wrong answer — click to see why▾
Why this is wrong here
Option B is incorrect because a global unicast IPv6 address is designed for routing across different networks, while link-local addresses are the ones that are limited to the local link and not routed.
★ When this WOULD be the correct answer
If the question asked about link-local IPv6 addresses specifically, then option B would be correct, as link-local addresses are indeed used only on the local link and are not routable beyond that scope.
Why candidates choose this
Candidates may confuse global unicast addresses with link-local addresses due to the similarities in their structure and the fact that both are types of IPv6 addresses, leading to a misunderstanding of their routing capabilities.
✗It is used only for loopback testing inside a device.Wrong answer — click to see why▾
Why this is wrong here
Option C is incorrect because a global unicast IPv6 address is designed for communication across different networks, not limited to loopback testing, which uses the loopback address (::1).
★ When this WOULD be the correct answer
If the exam question asked about the purpose of the IPv6 loopback address specifically, stating that it is used only for loopback testing inside a device would be correct. For example, a question could ask, 'What is the function of the IPv6 address ::1?'
Why candidates choose this
Candidates may choose this option due to confusion between different types of IPv6 addresses, particularly if they recall that loopback addresses are valid in IPv6 but misapply that knowledge to global unicast addresses.
✗It is created only when EUI-64 is disabled.Wrong answer — click to see why▾
Why this is wrong here
Option D is incorrect because global unicast addresses can be created regardless of whether EUI-64 is enabled or disabled; they are not limited to a specific address creation method.
★ When this WOULD be the correct answer
In a question that asks specifically about the address creation process in IPv6, stating that a global unicast address is created only when EUI-64 is disabled could be correct if the context is about a specific configuration scenario where EUI-64 is indeed disabled, leading to a different address generation method.
Why candidates choose this
Candidates may find this option tempting due to confusion between address types and the methods of address generation in IPv6, leading them to mistakenly associate global unicast addresses with EUI-64 settings.
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
A frequent exam trap is mistaking the global unicast IPv6 address for a link-local or loopback address. Link-local addresses are confined to the local network segment and never routed, while loopback addresses are used only for internal device testing. Candidates often confuse these scopes because all are IPv6 unicast addresses but serve very different purposes. Another trap is believing global unicast addresses depend on EUI-64 addressing, which is incorrect since global unicast addresses can be assigned regardless of EUI-64 usage. Understanding the address scope and routing capability is critical to avoid this confusion.
Detailed technical explanation
How to think about this question
A global unicast IPv6 address is a unique address assigned to an interface that is routable on the IPv6 internet or within an enterprise network. It functions similarly to a public IPv4 address, allowing devices to communicate across different networks via routing protocols. These addresses typically start with the prefix 2000::/3, ensuring global uniqueness and reachability. Unlike link-local or loopback addresses, global unicast addresses are designed for end-to-end communication beyond the local segment.
The decision to use a global unicast address depends on the scope of communication required. If a device needs to communicate beyond its local link, a global unicast address is necessary. Cisco devices use these addresses in routing protocols such as OSPFv3 or EIGRP for IPv6 to establish neighbor relationships and exchange routing information. The address assignment can be manual or automatic, including SLAAC or DHCPv6, but the presence of a global unicast address is essential for routed IPv6 communication.
A common exam trap is confusing global unicast addresses with link-local or loopback addresses. Link-local addresses (FE80::/10) are automatically assigned and only valid on the local link, never routed. Loopback addresses (::1) are used internally for testing and diagnostics. Misunderstanding these scopes can lead to incorrect answers. Practically, network engineers must ensure global unicast addresses are correctly assigned to interfaces that require external communication, while link-local addresses support routing protocol operations on local links.
KKey Concepts to Remember
A global unicast IPv6 address uniquely identifies an interface and is routable across different IPv6 networks.
Global unicast addresses typically use the 2000::/3 prefix, ensuring global uniqueness and reachability.
Link-local IPv6 addresses are limited to local network segments and are never routed beyond the local link.
Loopback IPv6 addresses (::1) are used internally on a device for testing and are not routable externally.
Routing protocols like OSPFv3 and EIGRP for IPv6 require global unicast addresses to establish neighbor relationships.
Global unicast IPv6 addresses can be assigned manually or automatically via SLAAC or DHCPv6, independent of EUI-64 usage.
Confusing global unicast addresses with link-local or loopback addresses is a common exam mistake to avoid.
Global unicast addresses enable end-to-end communication across networks, unlike link-local or loopback addresses.
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 uniquely identifies an interface and is routable across different IPv6 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 uniquely identifies an interface and is routable across different IPv6 networks. 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 200-301 question in full detail.
Review a global unicast IPv6 address uniquely identifies an interface and is routable across different IPv6 networks., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — A global unicast IPv6 address uniquely identifies an interface and is routable across different IPv6 networks..
What is the correct answer to this question?
The correct answer is: It is the normal IPv6 address type used for routed communication across networks. — A global unicast IPv6 address is the normal IPv6 address type used for routed communication across networks. In practical terms, it plays the role that a normal public unicast IPv4 address plays in routed IPv4 communication. Unlike a link-local address, it is not limited to the local segment only.
This question tests whether you can separate IPv6 address scope correctly. The common mistake is to confuse global unicast with link-local or loopback addressing.
What should I do if I get this 200-301 question wrong?
Review a global unicast IPv6 address uniquely identifies an interface and is routable across different IPv6 networks., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
A global unicast IPv6 address uniquely identifies an interface and is routable across different IPv6 networks.
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