Authorized Self-Study Guide Building Scalable Cisco Internetworks (BSCI), Third Edition

Appendix G. Open System Interconnection (OSI) Reference Model

This appendix contains information on the Open System Interconnection (OSI) reference model. It includes the following sections:

• Characteristics of the OSI Layers

• Protocols

• OSI Model and Communication Between Systems

• OSI Model’s Physical Layer

• OSI Model’s Data Link Layer

• OSI Model’s Network Layer

• OSI Model’s Transport Layer

• OSI Model’s Session Layer

• OSI Model’s Presentation Layer

• OSI Model’s Application Layer

• Information Formats

The Open System Interconnection (OSI) reference model describes how information from a software application in one computer moves through a network medium to a software application in another computer. The OSI reference model is a conceptual model that is composed of seven ...