Mac Integration Basics v10.7 - Apple

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Network Security
In addition to user account and system security, network security is also very
important to organizations. The OS X firewall protects your Mac from unauthorized
incoming access from other systems on both a local network and the Internet. The
virtual private networking (VPN) service provides a secure method for your computer
to remotely access networks.
OS X Firewall
The OS X personal firewall can be used to block unwanted incoming connections to
your computer. A firewall protects the services on your computer from other
computers on the network or Internet. Services that are turned on in Sharing
preferences already appear in the list of services to which other computers can
connect. To prevent incoming connections to one of these services, you must turn off
the service in Sharing preferences.
Enable the OS X firewall:
1. Choose Apple menu > System Preferences, click Security & Privacy, and then click
Firewall.
2. Click the lock icon to unlock it, and then type an administrator name and password.