1.3.3 Networks

Question 1

What is circuit switching?

Answer 1

The process of creating a direct link between two devices and transferring data the entire duration of the link

Question 2

What does the header of a data packet contain?

Answer 2

• The sender and recipient IP addresses
• Protocols being used
• Order of the packets
• The time to live / hop limit

Question 3

What does the packet trailer contain?

Answer 3

The checksum or cyclic redundancy check

Question 4

What is a proxy server?

Answer 4

A web server that acts as an intermediary, collecting and sending data on behalf of a user, protecting their identity

Question 5

What does an NIC do?

Answer 5

Connects a computer to a network

Question 6

What does a router do?

Answer 6

Connects a network to a network

Question 7

What is the function of a gateway?

Answer 7

Connects two networks and translates protocols so they can communicate without any issues

Question 8

What is the function of the application layer during data transmission?

Answer 8

The Application Layer specifies what protocols need to be used to relate the application to what it’s being used for

Question 9

What is the role of the transport layer during data
transmission?

Answer 9

Establishes an end-to-end connection between the source and recipient computers. It also splits up the data into packets

Question 10

What is the role of the internet layer during data transmission?

Answer 10

Adds the source and destination IP addresses

Question 11

What is the function of the link layer during data
transmission?

Answer 11

Adds the MAC addresses to the packet

Question 12

What is a firewall?

Answer 12

A piece of software that monitors and filters packets going to and from a network