CCNA IPv6 link-local addresses (FE80::/10) Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  Global unicast

  Why it's wrong here

  Global unicast addresses (2000::/3) are globally routable and must be obtained either through static configuration, Stateless Address Autoconfiguration (SLAAC), or DHCPv6; they are not automatically created on an interface merely by activating IPv6. The interface's automatic address is strictly link-local, while a global address is assigned based on network prefix information from Router Advertisements or manual setup. This makes global unicast an incorrect answer for an automatically created address type.

  When this WOULD be correct

  If the question asked for an IPv6 address type that is routable on the internet and can be used for global communication, then Global unicast would be the correct answer, as it is designed for that purpose.

• ✓

  Link-local

  Why this is correct

  Link-local addresses (fe80::/10) are automatically generated on all IPv6-enabled interfaces and remain confined to a single link; they are not routed by routers. This automatic creation happens immediately when IPv6 is enabled on the interface, and the address is typically derived from the interface's MAC address using EUI-64 or generated randomly with privacy extensions. This is the address type the question refers to.

• ✗

  Unique local

  Why it's wrong here

  Unique local addresses (fc00::/7) serve a role analogous to IPv4 private addresses, but they are not automatically configured on an interface when IPv6 is enabled. Instead, they require explicit manual configuration or stateful assignment via DHCPv6, and they are designed to be routable within a private site, not restricted to a single link. Because they are not automatically created, they cannot be the correct answer.

  When this WOULD be correct

  If the question were to ask which IPv6 address type is used for communication within a private network and is not routable on the global internet, then Unique Local would be the correct answer, as it fits the criteria for private addressing.

• ✗

  Multicast

  Why it's wrong here

  Multicast addresses (ff00::/8) identify a group of interfaces across a network, not a single interface's unicast identity, and an IPv6 host does not automatically create a multicast address as a source or host address. While an interface joins multicast groups like all-nodes (ff02::1) and solicited-node automatically, those are destination-only group addresses, not address types assigned to the interface itself. Thus multicast is not an automatically created interface address type in the context of this question.

  When this WOULD be correct

  If the question asked for the type of IPv6 address used for sending packets to multiple devices on a local network segment, then 'multicast' would be the correct answer. For example, a question could specify the address type used for group communication within a local subnet.

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.

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?”