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Unit 7: Network Security

many millions of computers. Currently, the Internet has more than 30 million users worldwide, Notes
and that number is growing rapidly. More than 100 countries are linked into exchanges of data,
news and opinions on Web servers.

Figure 7.4: The Internet

7.2.6 Intranet

Intranet can be designed as a network connecting an affiliated set of clients using standard
Internet protocols, especially TCP/IP and HTTP. Another definition of an intranet would be that
an IP-based network of notes behind a firewall, or behind several firewalls connected by secure,
possibly virtual, networks. In general, a web is an unstructured client/server network that uses
HTTP as its transaction protocol. The World Wide Web comprises all HTTP nodes on the public
Internet. An internal web comprises all HTTP nodes on a private network, such as an
organization’s LAN or WAN. Figure displays the simple model of an organisation’s intranet.

Figure 7.5: The Functioning of Intranet

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