====== U ======

  * [[wp>U2F]] = Universal 2nd Factor
    * Obsoleted by [[wp>CTAP]] and [[wp>WebAuthn]]
    * Supported by Google Titan security keys
  * ULA = (IPV6) Unique Local Address
    * An IPv6 counterpart to RFC 1918 private address space, defined in [[https://datatracker.ietf.org/doc/html/rfc4193|RFC 4193]], but internally routable. 
    * Compare [[gcp:g|GUA]].
    * Dual-homed VMs can have an ULA and a GUA.
    * Google's ULA prefix is ''fd20::/20''; GCP ULAs are ''/48'' in that range.
  * [[wp>URL]] map: 
    * a GCP configuration resource used to route requests to backend services or backend buckets.
    * For example, with an external HTTP(S) load balancer, you can use a single URL map to route requests to different destinations based on the rules configured in the URL map