Q$2)$ Consider the following exchange between an FTP client and an FTP server:

a$.$ How many connections are needed to run an FTP application? What are the types of these

connections and which port is used for each connection $($server side$)?$

b$.$ How many files are transferred during this exchange? Justify your answer.

c$.$ Which connection $($s$)$ is $($are$)$ used for packets from $1$ to $13?$

d$.$ Explain the purpose of the packet number $6.$

e$.$ If the client wants to retrieve a new file after packet $20,$ which new packets will be exchanged?

Justify your answer.

f$.$ Write the command that should be sent by the client to display the name of the current directory

$($the name of the current directory is MY$-$DIR$).$