[p0d]

I'm a sysadmin and worked in education for 13 years. Most of the age group you are referring to don't understand the difference between who provides their broadband and their browser. My advice would be more show and less tell.

For example, setup an actual server in the classroom. Get them browsing/connecting to the server and then pull the plug (ethernet/wifi) on the server. Then they will see the connection.

Have the students deface their school website with developer tools. That will also go down well I'm sure.

I guess I am saying keep it simple. I did a lesson once on how the web connects with the students holding bits of string. The students enjoyed it and some staff passing by even sat in on the lesson.

Try your best to cater for all the students in the class and not just the whizzos and you will do well.

(Also be prepared to have 10/15 minutes of your time lost to students arriving and getting settled in.)