Doing some practice questions to study for a cert and one of the questions I was going through asked, "What is the first valid host address for a node residing in the 10.119.136.143/20 network?"
I came up with a network address of 10.119.128.0 and when checking my answer for the first valid host I noticed it was 10.119.128.1. Why is the answer that and not 10.119.129.0? Seems all the other subnetting questions I've answered up until this point just add a 1 to the "interesting" octet, but this one rolls over into the next.
Sorry for the dumb question!
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