Application (Layer 7) Firewalls - What they are and how they work

Application Layer, known as Layer 7 or L7 firewalls are capable of inspecting, filtering and even adjusting data up to Layer 7 of the OSI model. They have visibility of the data inside a L7 connection. For HTTP this means content, headers, DNS names .. for SMTP this would mean visibility of email metadata and for plaintext emails the contents.

Understanding how L7 firewalls work and how they differ from more traditional L3, 4 and 5 devices is an essential fundamental skills for anyone in the networking, security or general technical space. In future videos i will be stepping through how AWS implement L7 firewalls into their product set.

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