OSI Model

Question 1

What is layer 1 of the OSI Model responsible for?

Answer 1

Physical

Network devices and transmission media.

Question 2

What is layer 2 of the OSI Model responsible for?

Answer 2

Data-link

Control of access, error checking and correction.

Question 3

What is layer 3 of the OSI Model responsible for?

Answer 3

Network

Transmission of the actual data packets and routing.

Question 4

What is layer 4 of the OSI Model responsible for?

Answer 4

Transport

Concerned with keeping track of segments of a network, checking successful transmission and packetisation.

Question 5

What is layer 5 of the OSI Model responsible for?

Answer 5

Session
Looks after starting, managing and ending a session. Provides for simplex, half-duplex and full duplex transmission methods.

Question 6

What is layer 6 of the OSI Model responsible for?

Answer 6

Presentation
Looks after any conversations between data as sent on the network and data as it is needed by the applications. This layer often handles encryption/decryption.

Question 7

What is layer 7 of the OSI Model responsible for?

Answer 7

Application

The layer closes to the user. It collects or delivers data and passes it to and from the presentation layer.