Question $4$

Describe briefly the main functionalities of the Presentation layer of the OSI model. $[5]$

Question $5$

Which layer of the OSI model adds a trailer and why? Describe briefly. $[5]$

Question $6$

Define process to process delivery with an appropriate example. $[5]$ Question $7$

"The OSI Reference Model has proven to be extremely useful in coordinating different groups

working on the different parts of the problem." $-$ What problem is the author talking about and

how was it solved? $[5]$Question $3$

In Figure $1,$ how many networks are present, and in there, how many LAN$($s$)$ and WAN$($s$)$ are

present and why? If PC$1$ wants to transmit data to PC$3,$ how many hops does it need to pass in

order to reach PC$3?[10]$

Figure $1$: Network Topology