1.2 OSI Model

Question 1

List OSI model layers in order.

Answer 1

7. Application
8. Presentation
9. Session
10. Transport
11. Network
12. Data Level
13. Physical

Question 2

What is the OSI layer 1 and describe its function?

Answer 2

Layer 1 is the physical layer.

This layer encompasses everything to do with the hardware used to transmit data. This includes all media like copper, fiber and even WIFI.

Question 3

What is the OSI layer 2 and describe its function?

Answer 3

Layer 2 is the data link layer.

This layer deals with MAC addressing and sending frames between devices.

Question 4

What is the OSI layer 3 and describe its function?

Answer 4

This is the Network layer.

This layer deals with IP addresses and sending frames between a client and server. Also fragments frames to traverse different networks.

Question 5

What is the OSI layer 4 and describe its function?

Answer 5

This is the Transport layer.

This layer deals with protocols and port numbers. Responsible for end to end flow control of communication between devices. Examples of layer 4 are TCP and UDP.

Question 6

What is the OSI layer 5 and describe its function?

Answer 6

Layer 5 is the session layer.

It establishes, manages and terminates connections. Also suspends or reestablishes connections. Tunneling protocol
S

Question 7

What is the OSI layer 6 and describe its function?

Answer 7

Layer 6 is the presentation layer.

Responsible for mapping data to a specific application. It transforms the data into a form the application will accept. Does character encoding and encryption

Question 8

What is the OSI layer 7 and describe its function?

Answer 8

Layer 7 is the application layer.

Interacts with a software applications that implement a communicating component. It’s not the application itself. API’s may operate as part of this layer.