computer science

Question 1

Application

Answer 1

• Selects and uses the correct protocol to transmit data
• Interacts with the user

Question 2

Transport

Answer 2

• Identifies the server port to use
• Identifies the client port to use
• Divides the data into packets
• Numbers the packets
• Adds the total number of packets
• Sets up communication between hosts / Establishes
  end to end communication
• Passes the packets to the network layer
• Checks the packets arrive at the destination
• Resends any packets that have not arrived

Question 3

Network

Answer 3

• Adds the source/sender’s IP address
• Adds the destination IP address
• Routes the packets

Question 4

Data link

Answer 4

• Controls physical connections between pieces of
  hardware
• Adds MAC addresses to the packets
• Sends the packets on their way
• Adds headers and trailers