In addition to denying and granting access, what other services does a firewall support?

A firewall is a tool to provide security to a network. It is used to protect an internal network or intranet against unauthorized access from the Internet or other outside networks. It restricts inbound and outbound access and can analyze all traffic between an internal network and the Internet. Users can configure a firewall to pass or block packets from specific IP addresses and ports. Firewalls often have network address translation (NAT) functionality. The hosts protected behind a firewall commonly have addresses in the private address range. Firewalls have such functionality to hide the true address of protected hosts. Firewalls are used by administrators to control Internet access based on keyword restriction. Some proxy firewalls can cache data so that clients can access frequently requested data from the local cache instead of using the Internet connection to request it. This is convenient for cutting down on unnecessary bandwidth consumption. Answer: B is incorrect. It is an area where a firewall faces difficulty in securing the network. It is the area where employees make alternate connections to the Internet for their personal use, resulting in useless rendering of the firewall.