CCNA Network Infrastructure and Connectivity 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: Routable over the public internet, assigned by RIRs.

  Why this is correct

  Global Unicast addresses comprise the 2000::/3 block and are unique across the entire IPv6 internet, enabling end-to-end routing through the global routing table. They are hierarchically allocated by Regional Internet Registries (RIRs) to ISPs and organizations, then subnetted at each level. This makes them directly routable over the public internet, analogous to IPv4 public addresses, until more-specific prefixes are assigned.

• ✗

  Link-Local: Routable across the entire enterprise network, used for inter-VLAN routing.

  Why it's wrong here

  Link-Local addresses use the FE80::/10 prefix and are automatically generated on every interface, but their functional scope ends at the local link or subnet. A router will never forward packets addressed to a link-local destination, so they cannot span VLANs or support inter-VLAN routing; inter-VLAN routing instead requires addresses that are routable between subnets, such as Global Unicast or Unique Local addresses. Their role is limited to on-link protocols like Neighbor Discovery and SLAAC, not enterprise-wide traffic.

  When this WOULD be correct

  This option would be correct if the question asked: 'Which IPv6 address type is automatically assigned on each interface, used for neighbor discovery, and is not routable beyond the local link?'

• ✗

  Unique Local: Globally unique and routable on the public internet, similar to Global Unicast.

  Why it's wrong here

  Unique Local addresses, defined in the FC00::/7 block, are privately scoped for internal site use and are specifically not routable on the public internet; they include a 40-bit pseudo-random global ID to minimize collision if networks merge, but that does not make them globally routable. This behavior parallels IPv4 private addresses such as 10.0.0.0/8, which are non-unique or locally unique but blocked from public forwarding. Consequently, describing them as globally unique and similar to Global Unicast is incorrect because their intended use is never internet transit.

  When this WOULD be correct

  In a question asking for an IPv6 address type that is globally unique but not intended for public routing, such as 'Which IPv6 address type is globally unique but limited to private networks?' Unique Local would be correct.

• ✗

  Multicast: Used for one-to-one communication between two specific hosts.

  Why it's wrong here

  Multicast addresses, identified by the FF00::/8 prefix, implement one-to-many delivery where a single packet is replicated by routers only to interfaces that have joined the corresponding multicast group. This contrasts sharply with unicast, which establishes a direct one-to-one path between exactly two communicating hosts. Since the IPv6 addressing model separates unicast, multicast, and new anycast types, labeling multicast as one-to-one misrepresents both its scope and its forwarding behavior.

  When this WOULD be correct

  A question asking: 'Which IPv6 address type is used for one-to-many communication, where a single packet is sent to multiple destinations?' would make Multicast the correct 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.

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?”

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