F5 authenticate for specifics URLS

not that much context.

but assuming you want to put a login page (with authentication against AD) for your admin pages then you need the APM module and an iRule to disable it for other URI. LTM can do some limited authentication but that is very limited and seems to get less every version.

alternatives are to block access to those pages from outside (i.e. internet) with an iRule or AFM. that is already safer and perhaps the admin pages can do the AD authentication themselves.