DHCP server(A computer running the Microsoft DHCP service that offers dynamic configuration of IP addresses and related information to DHCP-enabled clients)
VPN server(A computer that accepts virtual private network (VPN) connections from VPN clients. A VPN server can provide a remote access VPN connection or a router-to-router VPN connection)
gatekeeper(A server that uses a directory to perform name-to-IP address translation, admission control, and call management services in H.323 conferencing)
