Question

Why are firewalls needed?

Provide an example of one type of firewall and how it functions

Answer 1

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The Benefits of a Firewall.

Anyone who connects to the Internet, as a single computer or whole network, should use a firewall. A Firewall can protect both individual computers and corporate networks from security threats such as worms, which attempt to exploit networking protocol to access a remote PC.

1. Packet filtering firewall

Packet filtering firewalls operate inline at junction points where devices such as routers and switches do their work. However, these firewalls don't route packets, but rather they compare each packet received to a set of established criteria -- such as the allowed IP addresses, packet type, port number and other aspects of the packet protocol headers. Packets that are flagged as troublesome are, generally speaking, unceremoniously dropped -- that is, they are not forwarded and, thus, cease to exist.

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