10.10. Restricting Network Services
Network services are the building blocks of many network environments. Connecting to the Internet, DNS, DHCP, and other protocols is the main reason for having a network in the first place. One of the best ways to ensure security for file sharing, web services, and mail services is to limit the access that computers have to them. Some computers may need access to these resources; denying them can be detrimental to the workflow. Others may not need access, and giving them access could be potentially damaging. For example, you might allow local users to your network to access your file server but will probably never want to allow access to the file server for users outside your network.
When architecting a network, ...
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