Discover the definition of the term Layer (Couche) presented by Les Assises de la Cybersécurité.


In the field of computer networks, network layers are a model designed to simplify the understanding of how the network works. One of the two main models (OSI, the other being TCP/IP) recognizes seven layers, from the physical layer (the cable itself) to the application layer (the way in which data is arranged so that applications know how to use it, for example protocols such as http for the web, SMTP for email, etc.). In cybersecurity, the notion of network layers is important because it defines different levels where it will be possible to place filtering solutions. The first firewalls, for example, operated at a low level (layers 2 and 3) and made it possible to fight against attacks that were very different from current application firewalls, which operate on layer 7 (application) in order to understand the behavior of applications.

The totally virtual aspect of network layers is a dream for many young parents.

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