How to add Serial Ports to CISCO routers in Packet Tracer software?

 Router connects to the private network through its Fast Ethernet port and connects to the public network (to another router) through Serial port

By default Cisco routers doesn't have serial ports. Therefore we need to add a serial port to router.

• first, open CISCO packet tracer software (if you are not currently working with one)
• then, drag and drop any type of router from the bottom of the interface in to the middle of the working area ( i have used 1841 router here.
• Click the Router--> select Physical tab-->select WIC-IT -->switch off the Router-->add the Serial port to the router (drag and drop the serial port that is displayed in the right bottom corner to the space given)     -->switch on the Router