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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[ajiteshrai]

I am so glad that i found your channel just by chance a month ago and watching priceless content here. I am sure that within a year content in this channel will reach out to thousands of people out their, i am just happy to be here so early . Thank you very much for wonderful content and teaching for free !!!

[marcoavendano]

This was an outstanding explanation of a generally complex topic. Thank you.

[frijolito]

I had no idea of this topic but after your video I have a first good view...thanks!!

[HUSTLEwithAHMADA]

You deserve great honour bro, your representation is next level

[vlajov]

So great straightforward explanation! Looking forward for that future video about AWS employing app firewall, I guess its WAF service.

[nordi]

I noticed you're saying Haych for H, when you mention HTTP. This made me curious, and distracted me from the whole presentation, because I needed to look up who says that. In case anyone else was hit by that, it's some people in Ireland. I do appreciate your time put into this though, I did come back to watch the whole thing again.

[zahiddigital]

so if your ISP is using layer 7 firewall/deep packet inspection they can actually see the pictures/data you upload online even if you upload it on secure/HTTPS/encrypted sites such as facebook etc?

[alexandrebeining]

Great video ! I've a question, does the normal firewall which operate at the layer 5 is what we call a "stateful" firewall ? And the previous one (layer 3-4) a "stateless" firewall ?

[vshalraj]

Amazing explanation to a general complex topic!

[amitb]

Does the application firewall inspect http response as well? Like WAF does?