Problem $11$ of Exercises in Chapter $7($version $7$ of the textbook$)$

The local area network shown in Figure $7-28$ has two hubs $(x$ and $Y)$ interconnecting the workstations and servers. What workstations and servers will receive a copy of a packet if the following workstations$/$servers transmit a message:

Workstation $1$ sends a message to workstation $3$:

Workstation $2$ sends a message to Server $1$:

Server $1$ sends a message to workstation $3$:

b$.$ Replace hub Y with a switch. Now what workstations and servers will receive a copy of a packet if the following workstations$/$servers transmit a message:

Workstation $1$ sends a message to workstation $3$:

Workstation $2$ sends a message to Server $1$:

Server $1$ sends a message to workstation $3$: