OSI Model Overview

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What is the OSI model?

The OSI model is a conceptual model created by the International Organization for Standardization to enable diverse communication systems to communicate using standard protocols.

Which layer of the OSI model is closest to the end user?

The Application Layer (Layer 7) is the closest to the end user.

What does the Presentation Layer in the OSI model do?

The Presentation Layer prepares or translates data between application and network formats.

How many layers are there in the OSI model?

There are seven layers in the OSI model. Signup and view all the answers

Give an example of an application that operates at Layer 7 of the OSI model.

A web browser such as Google Chrome or an app like Skype operates at Layer 7. Signup and view all the answers

What organization created the OSI model?

The International Organization for Standardization (ISO) created the OSI model. Signup and view all the answers

What layer of the OSI model represents the electrical and physical characteristics of a system?

Physical Layer Signup and view all the answers

When troubleshooting a networking problem, why do many professionals check the physical layer first?

To ensure all cables are properly connected and power is not disconnected. Signup and view all the answers

Define encapsulation in networking.

A process of adding protocol information to data as it passes through layers. Signup and view all the answers

Where does the encapsulation process take place - in the sending or receiving computer?

Sending computer Signup and view all the answers

What are the terms used to represent encapsulated data before and after the data in networking models?

Header and trailer Signup and view all the answers

In which model do the terms encapsulation and de-encapsulation play a role in adding and removing protocol information?

Networking model Signup and view all the answers

What is the main function of the Session Layer in the OSI model?

Setup, coordination, and termination between applications at each end of the session. Signup and view all the answers

Which layer in the OSI model deals with the coordination of data transfer between end systems and hosts?

Transport Layer Signup and view all the answers

What is the best-known example of a protocol at the Transport Layer?

Transmission Control Protocol (TCP) Signup and view all the answers

At which layer of the OSI model do TCP and UDP port numbers operate?

Layer 4 - Transport Layer Signup and view all the answers

What is the main responsibility of the Network Layer in the OSI model?

Packet forwarding, including routing through different routers. Signup and view all the answers

What are the two sublayers of the Data Link Layer in the OSI model?

Media Access Control (MAC) layer and Logical Link Control (LLC) layer. Signup and view all the answers