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Are courses updated?

Hello there,

I’m just wondering if CS courses are updated because I saw a note in the (CS402: Computer Communications and Networks) course that says:

You may notice that some information in the textbook is not completely up-to-date. The Wikipedia article below includes some more recent information for you to explore. Also, Figure 2.1 in the textbook shows the number of hosts on the Internet only through 2007.

So, how do I know if the course content is updated by professors or not?

I really appreciate your help in advance, Thanks.

@sean