Hi. My name is ***** ***** I can help you set up a span session on your switch. Once set up, whatever you plug into the span session port should be able to see all of your traffic that passes through your 2960C switch which, from what you describe, should be everything. Internet, wired, and wireless.
The basics are:
This example shows how to set up SPAN session 1 for monitoring source port traffic to a destination port. First, any existing SPAN configuration for session 1 is deleted, and then bidirectional traffic is mirrored from source Gigabit Ethernet port 1 to destination Gigabit Ethernet port 2, retaining the encapsulation method.
Switch(config)# no monitor session 1
Switch(config)# monitor session 1 source interface gigabitethernet1/0/1
Switch(config)# monitor session 1 destination interface gigabitethernet1/0/2 encapsulation replicate
This example shows how to remove port 1 as a SPAN source for SPAN session 1:
Switch(config)# no monitor session 1 source interface gigabitethernet1/0/1
Complete information is found in the Cisco documentation here:
Please note if you are not running version 15 code on your switch, the commands might be a little different. Thus if they don't work, please let me know which version of code you are running and I'll try and dig up the docs for your specific version.
Please let me know if you have questions and how it goes.