Network and Transport Layers

Question 1

What are the three functions of Layer 4 (Transport Layer)?

Answer 1

linking the application layer to the network, segmenting (breaking long messages into smaller packets for transmission), and session management (establishing an end-to-end connection between the sender and receiver).

Question 2

What are the two functions of Layer 3 (Network Layer)?

Answer 2

routing (determining the next computer to which the message should be sent to reach the final destination) and addressing (finding the address of that next computer).

Question 3

What is the PDU at the transport layer called?

Answer 3

A segment.