Intranet is a computer-based network protocol, TCP / IP, such as the internet, it is only used in internal company / office, with a web-based application and data communication technology such as internet

If a body of business / business / institutions expose some of the internal network to the outside community, then this is called the Ekstranet.

Inter-intranet can communicate with each other with each other through the Internet connection that provides the backbone communication distance jauh.Akan but actually does not need an intranet connection to the outside Internet to function as benar.Intranet using all TCP / IP and application so that we have " private "Internet.

And put through a router firewall, agency business / company can block access to intranet.Firewall is a software / hardware to manage access to someone in the user access to intranet or in the local network to the outside network.

Information system network (English: the network information system abbreviated NIS) is a protocol that is used to designate directories and offers services in several UNIX platforms.

NIS function as a "phone book" that can be used to find resources in a network based on TCP / IP. Therefore, the original name of the NIS protocol is the Yellow Pages. NIS allow users and applications are through the network to find and access files and applications anywhere in the access network with a central server NIS. Information provided by the NIS Server example is the password file (/ etc / passwd), table hosts (/ etc / hosts), and e-mail address.

NIS operate by sending packets of data in a broadcast, and on most UNIX platforms, the NIS client can communicate with the NIS server by using Remote Procedure Call protocol, which runs in the top layer transport protocol, User Datagram Protocol (UDP). Implementation of the NIS service initially be less so in terms of security. Therefore, many NIS servers in a network-based UNIX often attacked. Sun Microsystems is developing a new protocol of the NIS, which is called as the NIS, which includes several security features (which is not owned by the NIS), although less popular.

http://id.wikipedia.org/wiki/Sistem_informasi_jaringan