Session and Presentation Layers Honolulu Community College Cisco Academy Training Center Semester 1...
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Transcript of Session and Presentation Layers Honolulu Community College Cisco Academy Training Center Semester 1...
Session and Presentation LayersHonolulu Community College
Cisco Academy Training Center
Semester 1
Version 2.1.1
Session Layer Functions
This includes starting, stopping, and re-synchronizing sessions (dialogue separation).
Modes of CommunicationTwo-way alternate communication is where two parties take turns sending messages to avoid interrupting each other. Another solution is that each person would type or talk whenever he/she wishes, regardless of who is transmitting/talking, and you would assume that more information is always on the way - this is referred to as two-way simultaneous communication. Determining which role to play is called dialogue control.
Session Layer Protocols
Presentation Layer Functions
Three Main Functions
Data formatting Extended Binary Coded Decimal Interchange Code (EBCDIC) or American Standard Code for Information Interchange (ASCII) or Unicode is used to represent characters onscreen. The presentation layer provides translation between these codes.
Data encryption Data compression
Other Presentation Layer Formats
HTML
This format acts as a set of directions that tell a Web browser how to display and manage documents. Hypertext Markup Language is the language of the Internet. HTML directions tell a browser whether to display text, or to hyperlink to another URL (Uniform Resource Locator). HTML is not a programming language, but is a set of directions for displaying a page.
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