For any enterprise network, a firewall must be installed in various infrastructure locations to protect from attackers. Firewalls receive and analyze traffic based on layers of the Open Systems Interconnection (OSI) model. The OSI model is an industry standard that describes the way systems communicate. Each layer represents a component of communications and the traffic that travels across a wire. Layer 7 is the top layer of the OSI model, and it provides the most information available to a firewall. It also represents the most common distributed denial-of-service (DDoS) attacks seen today, which is why layer 7 firewalls are preferred over older firewall standards.
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