Assign the technical terms Frames, Packets, Segments, and Signals to the layers of the OSI reference model. $[4]$

Suppose that a message $45000034B612400040060$ A$00008$B$5$BC$6$AEE$0$ is transmitted using the internet checksum mechanism.

a$)$ At the sender$\text{'}$s$,$ show the actual message transmitted. Show all your calculations. $[5]$

b$)$ At the receiver's, show the actual message received. Suppose the message was received without errors. Show all your calculations. $[5]$

Receiver $x$ got the message $450000$E$702$FC$4000360637$BC$6$CA$0$A$3300$A$00008$B from Sender $Y.$ Verify the internet checksum. To see whether the message received was correct or in error. Show all your calculations. $[6]$