Networking: Chapter 2 (The OSI Network Model)

Question 1

What is the Open Systems Interconnection (OSI) model?

Answer 1

• The OSI model is a set of protocols which standardise the transmission of data between computer systems on a network.

Question 2

What is the correct order of the OSI model from top layer to bottom layer?

Answer 2

• Application, Presentation, Session, Transport, Network, Data Link then Physical.

Question 3

What is the Application layer?

Answer 3

• The Application layer provides interfaces for network applications.
• FTP, HTTP and SMTP operate at this layer.

Question 4

What is the Presentation layer?

Answer 4

• The Presentation layer manages the way data is represented so that the computer can understand this data.
• HTML and ASCII operate at this layer

Question 5

What is the Session layer?

Answer 5

• The Session layer creates a connection between the device and the network and maintains it
• The Session layer manages log on and password authentication.

Question 6

What is the Transport layer?

Answer 6

• The Transport layer breaks up files into segments for transport over a network and guarantees these segments are not lost.
• TCP/IP operates at this layer

Question 7

What is the Network layer?

Answer 7

• The network layer crates headers for packets of data and routes these packets.
• Routers operates at this layer

Question 8

What is the Data Link layer?

Answer 8

• The Data Link layer guarantees error free transmission.

* Switches operate at this layer

Question 9

What is the Physical layer?

Answer 9

• The Physical layer transmits bits over the physical characteristics of the network interface.
• Hubs and repeaters operate at this layer