So is your argument actually that it's not necessary for people to be able to do this? Or is it that it's not nearly in-depth enough. If you're arguing the latter, I'm pretty sure everyone agrees; this was described as his version of fizzbuzz, to weed out people who literally just can't program. If you're arguing the former, that seems insane. Knowing how a TCP/IP network works is great, but if you're incapable of writing code to implement your knowledge, you're not very useful