Switched Network
Network Tutorials. Basic LAN/WAN troubleshooting tips and free IT resources
http://www.networktutorials.info/switching_tutorial.html

Chip programmer
Dataman specialize in developing, manufacturing and supporting high-quality, well-designed test and measurement equipment at competitive prices.
http://www.dataman.com/

What is my IP address
Do you want to see your IP? This is your portal. You can answer the tipical question: What is my IP? now!!! And here you have a lot of tutorials, speed test, ip tools,...
http://www.see-my-ip.com