December 2017
Intermediate to advanced
410 pages
11h 5m
English
Content preview from Enterprise Cloud Security and Governance
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How a firewall works?
The firewall acts as the front end for receiving packets from remote servers. Whenever a request comes, it is first received at the firewall end:
The firewall will check its Rule table to see if a particular IP is allowed to connect to the remote Server on the specified Port.
If the rule is Allow, then the firewall will allow the packet to go inside; however, if it is denied, then the access is blocked.
There are three major sets in which rules are configured:
- Source IP address
- Destination port
- Rule (Allow or Deny)
If we look at the preceding diagram, the IP address starting from 52.24.52.24 is allowed to access the ...
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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.