In other
words, networks today do not have a single point of entrance; they are multi-entry open environments where
controlled access is required from anywhere within the network. This transformation leads us to start thinking in
terms of multiperimeter networks.
The Difficulty of Defining Perimeter
Traditional networks are growing with the merging of remote network access. Wireless networks, laptops,
mobile phones, PDAs, and numerous other wireless gadgets need to connect from outside the enterprise into
the corporate network. To fulfill these needs, the concept of inside versus outside becomes rather complicated.
For example, when you connect to the corporate network using a virtual private network (VPN), you are no
longer on the outside the network. You are now on the inside of the network, and so is everything that is
running on your computer.
Globally networked businesses rely on their networks to communicate with employees, customers, partners,
and suppliers. Although immediate access to information and communication is an advantage, it raises concerns
about security and protecting access to critical network resources.
Network administrators need to know who is accessing which resources and establish clear perimeters to control
the access.
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