15-47Lesson 5 Configuring Windows Firewall■
Limits the network traffic that comes into a computer by blocking transmission
over all ports except those specifically configured to allow traffic to reach the
computer. When you allow a specific type of traffic into a computer through Win-
dows Firewall, this is called creating an exception. You can create exceptions by
specifying the file name of an application or by configuring specified ports for
which to allow traffic. Windows Firewall lets you create exceptions for each net-
work connection. This differs from Internet Connection Firewall, which only
allowed you to create global exceptions that affected all connections.
■ Can restrict traffic by IP address (or IP address range), meaning that only traffic
from computers with valid IP addresses is allowed through the firewall.
■ Allows you to enable or disable Windows Firewall on each connection configured
on a computer running Windows XP Professional, whether that connection is a
LAN connection, dial-up connection, or wireless connection. You can also set glo-
bal configurations that affect all connections. This differs from Internet Connection
Firewall, which only allowed you to enable or disable the firewall globally for all
connections.
■ Allows you to keep a security log of blocked traffic so that you can view firewall
activity.
■ Performs stateful packet filtering during startup, so that the computer can perform
basic network tasks (such as contacting DHCP and DNS servers) and still be pro-
tected. This differs from Internet Connection Firewall, which did not perform any
filtering during startup.
How to Enable or Disable Windows Firewall for all Network
Connections
The only users who can make changes to Windows Firewall settings are those who log
on to the computer with a user account that is a member of the local Administrators
group. To enable or disable Windows Firewall for all network connections, use these
steps:
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