Open Systems Interconnection Model

What is the Open Systems Interconnection Model (OSI Model)?

A model that helps explain how the seven different protocols work as well as how networking devices communicate with each other.

Going from layer seven to layer one is known as:

Encapsulation

Going from layer one to layer seven is known as:

Decapsulation

What is the first layer?

Physical Layer

What is the second layer?

Data Link Layer

What is the third layer?

Network Layer

What is the fourth layer?

Transport Layer

What is the fifth layer?

Session Layer

What is the sixth layer?

Presentation Layer

What is the seventh layer?

Application Layer

What is the purpose of the Application Layer?

It serves as the interface between applications that a person uses and the network protocol needed to transmit a message.

What is the purpose of the Presentation Layer?

This layer transforms data received from another layer into a format that other devices using the OSI model can interpret, such as standard formats for videos, images, and web pages.

What is the purpose of the Session Layer?

This layer allows communication between devices to be established and maintained. This layer also allow networking devices to have dialogue with each other.

What is the purpose of the Transport Layer?

This layer supports and controls the communication connections between devices. This involves setting the rules for how devices are referenced, the amount of data that can be transmitted, validating the data's integrity, and determining whether data has been lost.

What is the purpose of the Network Layer?

This layer adds routing and address headers or footers to the data, such as source and destination IP addresses, so that the message reaches the correct devices.

What is the purpose of the Data Link Layer?

This layer formats data packets for transmission. This is determined by the hardware and networking technology.

What is the purpose of the Physical Layer?

This layer converts the message sent from the previous layer into bits so it can be transmitted to other physical devices.

True or false: The Application Layer represents the actual application being used

False

True or false: The Network Layer detects errors.

True

True or false: Encryption occurs at the Presentation Layer

True

Which layer adds Media Access Control (MAC) Addresses?

Data Link Layer

True or false: The physical layer uses Ethernet

False