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DNS is a world-wide system that translates the name of computers on the Internet into their underlying numeric IP address. For example, computerworld.com might be translated to either 151.101.128.230, 151.101.64.230 or 151.101.192.230. Humans deal with names, computers deal with numbers.
I mention this because a problem with DNS can make an otherwise functional Internet connection appear to be broken.
Fortunately, it's easy to test an apparently broken Internet connection to see if the problem is limited to DNS. All that's needed is some browser bookmarks. Specifically, we need to bookmark some IP addresses.
A great place to start is by bookmarking
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