May 2019
Intermediate to advanced
478 pages
11h 21m
English
Content preview from Hands-On Network Programming with C
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Question format
The DNS Question Format consists of a name followed by two 16-bit values—QTYPE and QCLASS. This Question Format is illustrated as follows:
QTYPE indicates the record type we are asking for, and QCLASS should be set to 1 to indicate the internet.
The name field involves a special encoding. First, a hostname should be broken up into its individual labels. For example, www.example.com would be broken up into www, example, and com. Then, each label should be prepended with 1 byte, indicating the label length. Finally, the entire name ends with a 0 byte.
Visually, the name www.example.com is encoded as follows:
If the QTYPE and ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.