Network conceptual models, protocols and devices

Question 1

Why do we need network models?

Answer 1

To abstract complex physical devices.
To encourage interoperability between different manufacturers.
To standardise terminology.

Question 2

What does layer 1 of the OSI model do?

Answer 2

Physical hardware. Responsible for cable types and frequencies of transmission.

Question 3

What does layer 2 of the OSI model do?

Answer 3

Data link. Responsible for how data is transferred between nodes. Includes MAC addresses.

Question 4

What does layer 3 of the OSI model do?

Answer 4

Network. Packet forwarding and routing. IP addressing. IMCP.

Question 5

What does layer 4 of the OSI model do?

Answer 5

Transport. Coordinates data transfer between end systems and hosts. Uses TCP and UDP.

Question 6

What does layer 5 of the OSI model do?

Answer 6

Session. Creates an environment that allows for data communication between two devices.

Question 7

What does layer 6 of the OSI model do?

Answer 7

Presentation. Prepares the data for transmission. Puts it in the correct format for that application or network layers.

Question 8

What does layer 7 of the OSI model do?

Answer 8

Application. The layer that the user interacts with.

Question 9

What are the 4 layers of the TCP/IP model?

Answer 9

Network interface.
Internet.
Transport.
Application.

Question 10

What are web servers?

Answer 10

Servers that hold information to control how web users access hosted files. They can be accesssed through domains and deliver content to the end-users device.