OSI Layer / Networking Device Summary

OSI Layer

Short Description

Device

7 Application Layer

ALL

Applications

The Application layer is

responsible for xchanging

information between the

programs running on a

computer and other services on a network, such as a database or print server.

Gateway

6 Presentation Layer

PEOPLE

Data Interpretation

The Presentation layer

formats information so

that it can be read by

an application.

5 Session Layer

SEEM

Session Control

The Session layer

determines how two

devices communicate.

This layer establishes

and monitors connections

between computers.

4 Transport Layer

TO

Transmission Control

The Transport layer corrects errors in transmission and ensures that the information is delivered reliably

3 Network Layer

NEED

Flow Control, Routing

The Network layer identifies computers on a

network and determines

how to direct information

transferring over a network.

Router

2 Data Link Layer

DATA

Maintain Data

The Data Link layer groups

Packages raw data bits into data frames

Bridge

(MAC Sublayer)

1 Physical Layer

PROCESSING

Physical Definition

The Physical layer defines how a transmission medium, such as a cable, connects to a computer. This layer also specifies how electrical information transfers through the transmission medium.

Repeater