In business, the subnet mask assigned to a device commonly is not the default mask based on the class of IP address being used. For example, at a college, the IP address 10.104.10.88 and subnet mask 255.255.255.0 are assigned to a computer. The 10 in the first octet shows that this is a class A IP address. A class A IP address has a default mask of 255.0.0.0. The 255 in the subnet mask is made up of eight 1s in binary in the first octet (11111111) followed by all 0s in the remaining octets (00000000.00000000.00000000).
The purpose of a subnet mask is to tell you (and the network devices) which portion of the IP address is ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
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.
Head of Cybersecurity
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.
Field Engineer
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.
Data Platform Tech Lead
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.
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.
