Entrypoint refers to the identity of a site in a multisite deployment to which down-level clients are added, i.e., these ...

Entrypoint refers to the identity of a site in a multisite deployment to which down-level clients are added, i.e., these clients can only connect to the specified site. If entrypoint parameter is not specified then the site to which the computer on which the cmdlet is executed belongs is used (user may or may not be specifying a ComputerName)