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Learning Network Forensics by Samir Datt

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Making firewalls talk

Simply the name, firewall, conjures up an image of a great wall of fire burning anything that is unauthorized and trying to pass through.

Just as the name suggests, in the digital world, a firewall prevents an unauthorized access to or from a network. A firewall is usually at the perimeter of a private network and the open Internet, it acts as a barrier and allows traffic through based on a set of pre-defined rules:

Making firewalls talk

The preceding image clearly demonstrates the functioning of a firewall. As we can see, the network traffic can either pass through or be rejected by the firewall when found to be contrary to a pre-defined rule. The ...

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