May 2019
Intermediate to advanced
478 pages
11h 21m
English
Content preview from Hands-On Network Programming with C
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Answer format
The DNS answer format consists of the same three fields that questions have; namely, a name followed by a 16-bit TYPE and a 16-bit CLASS. The answer format then has a 32-bit TTL field. This field specifies how many seconds the answer is allowed to be cached for. TTL is followed by a 16-bit length specifier, RDLENGTH, followed by data. The data is RDLENGTH long, and the data's interpretation is dependent upon the type specified by TYPE.
Visually, the answer format is shown in the following diagram:
Keep in mind that most DNS servers use name pointers in their answer names. This is because the DNS response will have already included ...
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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.