O'Reilly logo

CCNA Exam Prep (Exam 640-802), Second Edition by Heather Stevenson, David Minutella, Jeremy Cioara

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Appendix . Fast Facts

OSI Model in Review

Table FF.1 lists the seven layers of the OSI model and significant aspects of each layer.

Table FF.1. The OSI Model

OSI Layer

Important Functions

Application

Provides an interface between a host’s communication software and any necessary external applications.

Evaluates what resources are necessary and available resources for communication between two devices.

Synchronizes client/server applications.

Provides error control and data integrity between applications.

Provides system-independent processes to a host.

Presentation

Presents data to the application layer.

Acts as a data format translator.

Handles the structuring of data and negotiating data transfer syntax to Layer 7.

Processes involved include data encryption, ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required