ISO OSI REFERENCE MODEL

• Industry standards Organization, Open System Interconnection Reference Model.
• All cisco networking is the OSI Reference Model
• OSI Model is the foundation of all network communications Cisco and othrs.
• OSI Reference Model has seven layers.
• Department of Defense has five layers.
• A layered model is one that takes a task, such as data communications, and breaks it down into a series of tasks, activities, or components.