Entrypoint refers to the identity of a site in a multisite deployment and when specified indicates that the DirectAccess ...

Entrypoint refers to the identity of a site in a multisite deployment and when specified indicates that the DirectAccess server properties should be configured for that site. Only the following properties are applicable at the site level. The rest of them are global properties and hence the entrypoint parameter has no meaning to them.
1. ClientIPv6Prefix
2. ConnectToAddress
3. TeredoState
If an entrypoint is not specified in a multisite deployment then the entrypoint to which the server on which the cmdlet is executed belongs is used. The server could also be represented by using the ComputerName parameter.
If both entrypoint and computername are specified and the ComputerName doesnt belong to the site represented by the entrypoint then the entrypoint takes precedence and the authentication type is configured for it.