to protect a computer or network from unauthorized access
Implement firewall hardware as well as firewall software on your computer/computer network and implement the use of Access Control Lists (ACLs) on your network's routers.
A personal network filter used to restrict access to particular Internet resources from a local computer.
The firewall controls what programs can access the internet and what programs from the internet can access the computer what is a firewall ?How does it work? http://computer.howstuffworks.com/computer-internet-security-channel.htm Is a security program which protects your computer from unauthorized access through the Internet. It resides on your PC and filters traffic coming and going from your computer http://www.Microsoft.com/protect/computer/firewall/faq.mspx
You can use its IP address or network name (your firewall has to be configured properly).
That sounds like a firewall.
Firewall provides a way of controlling network access to a computer. However, using firewall may degrade the performance of the system. It is also difficult to configure and maintain the firewall.
The firewall that only allows packets of registered connection is called packet filter. It is also the central piece in firewalling.
Windows Firewall
firewall
Firewall
the action of gaining access to a computer or a network by entering a username and password