General Musings

Subnet Mask

I will never forget the first real technical question I had during an interview. I have worked in IT for a couple of years, but most of my interviews have been pretty informal so far.

Not this last one, and I found myself pretty unprepared. The first and last technical question I got was, “what is a subnet mask.” Needless to say, I froze and could only point out that it divides the network. . which isn’t quite right. A subnet mask divides an address into a network portion and a host portion.

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