It's good to be able to do things the old fashioned way - but when I was in networking class, the instructor got pissed at me when I mentioned subnetting was not something a boss wants to see an employee doing by hand. You might even get wrote up for poor time management skills. The app on my phone can do it a whole lot faster than I can with a pencil.
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I'm not completely useless, I can be used as a bad example.
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