7-Layers of the OSI ModelHigh-Tech Talk - Open Systems Interconnection

Heather BorosNet 101 - Baker College, 2013

This presentation will show a representation of the OSI Model,

Open Systems Interconnection Model, starting with the sending end of the data

transmission and finishing at the receiving end of the transmission.

AKA, let’s send an e-mail.

Layer 7 - Application Layer

“The Application layer serves as the interface between the user and the

network.”

Layer 6 - Presentation Layer

“The Presentation layer translates the converted message data into a language

the receiving computer can

process.”

Layer 5 - Session Layer

“The Session layer starts, stops and

maintains the order of the connection.”

Layer 4 - Transport Layer

“The Transport layer ensures

proper and orderly delivery of the file

or message.”

Layer 3 - Network Layer

“The Network layer routes data from

sender to receiver.”

Layer 2 - Data Link

“The Data Link layer supervises the transmission of of the message by specifying the network and grouping

the data.”

Layer 1 - Physical Layer

“The Physical layer encodes the packets into a recognized signal that will carry them to the receiving

computer.”

“An example would be, analog signals being sent over a telephone line.”

Not over yet….

Now, lets run through this one more time, only this time, we will go backwards through the 7 layers.

It is the only way to get the information to the receiver….

Layer 1 - Physical Layer

“The Physical layer encodes the packets into a recognized signal that will carry them to the receiving

computer.”

“An example would be, analog signals being sent over a telephone line.”

Layer 2 - Data Link

“The Data Link layer supervises the transmission of of the message by specifying the network and grouping

the data.”

Layer 3 - Network Layer

“The Network layer routes data from

sender to receiver.”

Layer 4 - Transport Layer

“The Transport layer ensures

proper and orderly delivery of the file

or message.”

Layer 5 - Session Layer

“The Session layer starts, stops and

maintains the order of the connection.”

Layer 6 - Presentation Layer

“The Presentation layer translates the converted message data into a language

the receiving computer can

process.”

Layer 7 - Application Layer

“The Application layer serves as the interface between the user and the

network.”

Ahhhh, the end

We have successfully sent an email from one person to another!

Let’s do it again!