OSI Model

End User Layer

Syntax Layer

Synch & send to ports

TCP

Packets

Frames

Physical Structures

Program that opens what was sent or creates what is to be sent

encrypt & decrypt

Logical Ports

Host to Host, Flow Control

"letter", Contains IP address

"envelopes", contains MAC address

cables, hubs, etc.

resource sharing

Remote File Access

Remote Printer Access

Directory services

Network Management

Character code translation

Data Conversion

Data Compression

Data Encryption

Character Set Translation

Session Establishment

Maintenance and termination

Session support

perform security

name recognition

logging

Message segmentation

Message Acknowledment

Message Traffic Control

Session Multiplexing

Routing

Subnet traffic control

Frame fragmentation

Logical-physical address mapping

Subnet usage accounting

Establishes & terminates the logical link between nodes

Frame Traffic Control

Frame Sequencing

Frame acknowledgment

Frame delimiting

Frame error checking

Media Access Control

Data Encoding

Physical Medium Attachment

Transmission technique

Baseband or broadband

Physical medium transmission Bits and Volts

Land Based Layer(s)

User Application

SMTP

JPEG/ASCII/TIFF

Logical Ports

RPC/SQL

NetBIOS

TCP & UDP

SPX

Routers

IP/IPX/ICMP

Switch

Bridge

WAP

PPP/SLIP

HUB

Open source Interconnection

First

Second

Third

Fourth

Fifth

Sixth

Seventh