Firewalls and Internet Security: Repelling the Wily Hacker, Second Edition

Chapter 13. Network Layout

intranet (in’ tr nt’), n. Any collection of networks owned by a single entity that is too large to be controlled by that entity.

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Corporations and other large entities often imagine that their networks are contained within a secure perimeter. While this may have been true when there were only few hundred hosts involved, large companies now have intranets with tens or even hundreds of thousands of hosts.

These nets typically have several firewalls, numerous connections to business partners (called extranets), VPNs to remote ...