An even easier way is to set up a proxy server that caches a copy of a web site so that other students that use it get it from the locally cached copy rather than having to go out to the Internet to get copies of all the pictures and pages. It should be possible to verify facts within a good web site. Information should usually be consistent with what is already known on the topic. If the information consists of ground-breaking new material, it should be well documented. They seem to present factual information, but it is not substantiated, or it is really statements of someone's opinion.
Web resources are only one of many ways to reach curriculum objectives.
For many students, it is very motivational to use the Internet, but only use it if it is the best way to cover those objectives.