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Network bandwidth is similar to water flow, it's a somewhat limited resource. Soon all schools will have a 100 Mbit connection to Central, and there should be lots of bandwidth to the Internet from there. However despite continuing efforts by Tech Services to open up a bigger pipe, demand will often outstrip supply.
While a 100 Mbit connection is a decent speed, as more devices and users connect we need to be cognizant that it is for the entire staff and student population. Technical measures are in place to limit individual connection speeds, particularly on the schoolguest Wi-Fi networks, but there are only a certain number of streaming videos that can be watched simultaneously.
Part of digital citizenship education for students is discussion about mindful and appropriate use. For example you can remind them about using streaming music sites such as Songza, Grooveshark, or Calm.com rather than having YouTube music videos playing while they work (video uses approximately 40 times as much bandwidth as audio).
Of course this will become a more pressing concern as more schools implement "bring your own device" (BYOD) and require students to use their devices for educational activities.