The reason it makes sense NOT to jump into deep packet inspection (or, as you ask, starting at L1), is that starting at an app layer you have a holistic view of *every* possible link in the chain ...

See OSI and ISO. Upper Layers Layers 7 through 4 are geared more to the application than the lower layers, which are designed to move packets from one place to another no matter what they contain.

The OSI model is the basis for most of the modern digital communications. Let’s dive into the seven layers of the OSI model and answers the billion-dollar question: how to protect the transmitted data ...

The third layer of the OSI Model, the network layer, is where most network engineers focus their time and expertise. As Darragh commented in my post on the data link layer, Layer 2 is cool but ...

The answer is where they operate in the OSI model. The Cyber branch’s main areas of concern are layers three, four, and five, so naturally their defense concern would be those three. Some could argue ...

My take This is a good example of de-cerebralisation in action. The 4-7 layer band in the OSI 7-layer network model covers some important tasks, such as load-balancing. But to date they have been ...

In reality, no one uses the pure seven-layer model any longer. OSI architects themselves soon realized that the three upper layers were not as easy to separate as the pretty pictures showed.

Whether it’s wired or wireless, most data communications today happens by way of packets of information travelling over one or more networks. But before these networks can work ...

The open systems interconnection (OSI) Seven-Layer Model defines a structured approach to creating protocols.