For example, users will try to create memorable passwords by using their names or social security numbers. Callback provides good security and cost savings to users who remotely access networks from one location. However, it is inconvenient for traveling executives. Packet filters allow network administrators to limit a user's access to specific services on the network. For example, a user may be allowed to send electronic mail, but not copy data files from the network.
Packet filtering on the communications server analyzes each message being sent from a remote client.
The filter can determine the computer and service the user is attempting to reach and either permit or deny access to that service. Data encryption uses a secret code to scramble information so that it can be read only by computers using the same code, or encryption technology. While encryption reduces the risk of unauthorized access, it doesn't create a totally safe networking environment on its own. Use of this site indicates you accept the Terms of Use and the Privacy Statement . For comments or questions about this site, contact us .