4. G0/3 is the trunk port which is connected to switch. Port2 is connected to Switch. Hence you can create 3 VLANS on Port2. Additionally you can also assign those VLANs to seperate zones if you want to.
Let me know is it possible in order to create zones only one uplink or I have to take three uplink for separate VLANS. -Yes,with one uplink also it is possible. -One link connected from fortigate to switch will act as trunk port once you configure VLANs on fortigate port2 interface.
Please find the attached screenshots for zones and VLANs created on fortigate.
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