Hello,
I have my own personal lab that consists of 3 Cisco 2610XM routers, a Cisco 2621,and a Cisco 2524. I also have 2950 48-port Switch and 2950 24-port switch. My problem is all of 2600 router only have two FastEthernet port and no serial ports. I would like to connect all the routers for labing.

Can you advice me on what I may need to do so, What interfaces and cables, please?