Common Ports - CompTIA A+ 220-1201 - 2.1

as we've discussed in a previous video the port numbers used by TCP and UDP can be very important when trying to communicate to a service so it's useful to know what those port numbers are if you're trying to troubleshoot any type of communications issue we might also need to know these port numbers if we're

performing some type of firewall configuration our firewalls often use TCP and UDP port numbers as one of the criteria that it uses to allow or to block Lo Network traffic as you go through this video you'll find there are a number of port numbers that you're required to know as part of your A+

studies you'll find that memorizing these port numbers can sometimes feel a bit tedious but after you start using these applications configuring firewalls and troubleshooting network communication you'll find that most of these port numbers become second nature for the purposes of your A+ studies make sure that you understand not only the port number and the protocol associated

with it but that you understand why that particular protocol is important and how it's used on the network the first port numbers we'll look at are port numbers TCP Port 20 and TCP Port 21 these two port numbers are commonly associated with FTP or the file transfer protocol FTP is a generic file

transfer protocol that could be used by many different operating systems to transfer information from one device to another and different types of FTP may use one or both of these prot protocols TCP Port 20 is often used as the active data transfer and Port 21 is often used as the administration or control Port

the FTP protocol often requires you to have some type of authentication into this system so it may ask for a username a password or some other type of authentication Factor FTP can also be configured with an anonymous or generic login so that anyone can log in regardless of what the username or password might be FTP is also a