When your computer transmits data to another computer, it adds a prefix to the data to indicate which port it wants to access. For instance, you may know that HTTP traffic occurs on port 80, HTTPS traffic uses port 443, FTP uses port 21, and SSH uses port 22. There are a number of ports that are well-known, but even these are only conventions. The point is, there’s nothing special about any port they are just a way to designate an address where data transference happens. This system could have been called anything, like "contacts," "connections," or even "penguins," but it the creators used "ports," and that’s the name that we still use today. For the purpose of firewalls, a port is an artificial construct created by the operating system to represent a pathway for a specific type of data. In the world of firewalls, the term port doesn’t refer to a physical connection like a USB, VGA, or HDMI port. PortsĪ firewall is able to manage this traffic by monitoring network ports. In reality, a firewall is just a piece of software controlling incoming and outgoing network traffic. If you understand firewalls, you can keep your network secure by making intelligent choices about the traffic you allow in and out.īecause "firewall" is such an exciting name, people often imagine an intricate Tron-style neon battle happening on the outskirts of a network, with packets of rogue data being set alight to protect your users’ the techno fortress. How well do you know Linux? Take a quiz and get a badgeįirewalls are a vital part of network security, so it’s important for a sysadmin to be familiar with how they work.Linux system administration skills assessment.A guide to installing applications on Linux.Download RHEL 9 at no charge through the Red Hat Developer program.
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