465: Simple Mail Transfer Protocol over SSL (SMTPS).HTTP protocol, with support for encryption. 443: Hypertext Transfer Protocol Secure (HTTPS).389: Lightweight Directory Access Protocol (LDAP).162: Simple Network Management Protocol (SNMP) Trap.161: Simple Network Management Protocol (SNMP).Protocol at the application level, for accessing emails. 143: Internet Message Access Protocol (IMAP).Protocol for secure transmission of data. 115: Secure File Transfer Protocol (SFTP).Protocol for receiving emails, version three. Protocol for receiving emails, version two.
80: Hypertext Transfer Protocol (HTTP).69: Trivial File Transfer Protocol (TFTP).67: Dynamic Host Configuration Protocol (DHCP).
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Protocol for obtaining registration of ownership details for IP addresses and domain names.
25: Simple Mail Transfer Protocol (SMTP). 23: Telnet, or terminal network, for protocol implementation text interface across a network. 21: File Transfer Protocol (FTP) control channel. 20: File Transfer Protocol (FTP) data channel. Bear with me, because the list is hefty, but hopefully it will serve as a useful reference guide for you. These are the most commonly used ports, alongside their port numbers. Skip to Open Port Scanners and Checkers List > Commonly Used Ports Port numbers are set and correspond to the function for which each port is responsible. In this instance, ports would determine where the request goes, guiding a web server request through port 80 and an FTP server request through port 21. When the server gets an inbound request, the operating system has to decide whether to send the request to the FTP or web server. This is a normal and frequent combination. In practice, port use looks something like this: imagine a server is running an FTP server and a web server simultaneously. Ports are the solution to this issue, allowing multiple processes and activities to have access to a shared network interface. The issue with this is usually devices only have a single network interface. Your hardware is constantly managing multiple activities and tasks at once, and many of these will require network access. 
These gateways exist in the network and can be points of vulnerability. You might describe ports as gates into your hardware.
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