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200-301 · Question #1359

In which circumstance would a network architect decide to implement a global unicast subnet instead of a unique local unicast subnet?

The correct answer is D. when the subnet must be routable over the internet. A network architect would choose a global unicast subnet when the network resources need to be directly accessible and routable over the public internet.

Submitted by kwame.gh· Mar 5, 2026

Question

In which circumstance would a network architect decide to implement a global unicast subnet instead of a unique local unicast subnet?

Options

  • Awhen the subnet must be available only within an organization
  • Bwhen the subnet does not need to be routable
  • Cwhen the addresses on the subnet must be equivalent to private IPv4 addresses
  • Dwhen the subnet must be routable over the internet

How the community answered

(42 responses)
  • A
    2% (1)
  • B
    7% (3)
  • C
    2% (1)
  • D
    88% (37)

Why each option

A network architect would choose a global unicast subnet when the network resources need to be directly accessible and routable over the public internet.

Awhen the subnet must be available only within an organization

Unique Local Addresses (ULAs) are specifically designed for use only within a private network or organization and are not intended for routing on the public internet, making this scenario a reason to use ULAs, not GUAs.

Bwhen the subnet does not need to be routable

If a subnet does not need to be routable to the public internet, Unique Local Addresses (ULAs) would be the appropriate choice, as they are not globally routed, directly contradicting the use case for GUAs.

Cwhen the addresses on the subnet must be equivalent to private IPv4 addresses

Unique Local Addresses (ULAs) are the IPv6 equivalent of private IPv4 addresses (like RFC 1918 addresses), meaning they are used for internal network communication and are not globally routable. This aligns with the use case for ULAs, not GUAs.

Dwhen the subnet must be routable over the internetCorrect

Global Unicast Addresses (GUAs) in IPv6 are globally unique and designed to be routable across the entire internet, similar to public IPv4 addresses. Therefore, if a subnet needs to be publicly accessible from outside the organization, GUAs must be used.

Concept tested: IPv6 Global Unicast vs. Unique Local Addresses

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/xe-16/ipv6-xe-16-book/ip6-addr-basic-conn.html

Topics

#IPv6 Addressing#Global Unicast IPv6#Unique Local IPv6#IPv6 Routability

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