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You don’t need to connect to a network to get the benefits of CPAN. You can install modules from CPAN even though you are on a plane flying over an ocean, in the middle of a desert, or even at a conference with broken Wi-Fi.
The repository is getting pretty big. It’s been around since around 1994, and the rate at which it’s growing is not slowing. As we write this, all of CPAN is just under 7 GB. You can’t even fit it on a DVD anymore.