
AWS Certified Advanced Networking – Specialty (ANS-C01) Certification Guide
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Several hardware and software protocols are used to facilitate and allow communication between systems across a network by dictating how data is transmitted, received, and processed. These protocols are standardized and organized into layers within the Open Systems Interconnection (OSI) model, developed by the International Organization for Standardization to provide an industry standard for understanding how these protocols interoperate. Refer to Figure A1.1 to see how the OSI model is composed of seven layers.
Figure A1.1: OSI model
As you can see in the preceding figure, each layer has a name that corresponds to the number. These numbers are often used as reference points when discussing the layers of the stack. Next, you will look at each of these layers in detail.
The OSI model consists of seven layers of abstraction that help visualize the process of encapsulation and decapsulation when two hosts...