A utility issues a temporary local user account on the FortiGate for a two-day facility inspection by an outside auditor, with the account set to expire automatically at the end of the visit. What is the main operational benefit of using an expiring guest-style account here rather than a standard, permanent local account?

A guest-style account with a built-in validity period automatically stops authenticating once that period elapses, closing the realistic operational gap where a temporary account is created, used briefly, and then forgotten — a forgotten but still-active outside account is a genuine, well-documented access-control risk that expiration directly addresses without depending on an administrator remembering a manual cleanup step. It does not bypass firewall policies; the account still must match a policy's user or group criteria like any other identified user, and any traffic it generates is still subject to normal policy evaluation, NAT, and security profiles. Nothing about account expiration grants automatic group membership — the auditor's account still needs to be explicitly placed in whatever group the relevant policy expects, and an unassigned account still hits the implicit deny. The account is also not exempt from being referenced by policy; expiration is a property of the account's validity, not a substitute for the policy match criteria that determine what it can reach in the first place. A caveat worth flagging: expiration protects against the account being forgotten, but does not protect against misuse during its valid window, so scoping the account's group access tightly still matters. Confirm expiration works by checking the account after its window closes to verify login is refused.