Ports are doors into your systems. Know these: 20/21: FTP (File Transfer) 22: SSH (Secure Shell) 23: Telnet (Insecure - avoid!) 25: SMTP (Email) 53: DNS (Internet Phonebook) 80: HTTP (Web) 443: HTTPS (Secure Web) 110: POP3 (Email) 143: IMAP (Email) 3389: RDP (Remote Desktop) #IT


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