Ask Slashdot: Software For Learning About Data Transmission?

bellwould writes "In teaching information tech to a 13-year-old with autism spectrum disorder (ASD), I've found she's wildly interested in the details of data transmission but not programming. We've had limited success with command-line tools like traceroute and tcpdump, but now I'm seeking tips/advice on software that may help her explore and visualize things like transmission protocols." What would you recommend?