How does network hardware and software implement protocols?

How does the different layers provide their service?

Can a layer be implemented in software or hardware?

Which are the five layers of the internet protocol stack

What is a point-to-point protocol?

What is the purpose of the transport layer

What is the purpose of the app-layer

What is the purpose of the network-layer

What is the purpose of the link-layer

What is the purpose of the physical-layer

What does "store and forward" entail in packet switching?

What kind of delays can a packet be subjected to?

TCP is bidirectional and full-duplex, what does that mean?