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Learning networking? These are the 15 most important ports every CCNA, Cybersecurity, and IT professional must know! From FTP (21) to Oracle DB (1521) — these ports are essential for understanding TCP/UDP communication, configuring firewalls, and cracking your next IT exam. 📌 Includes: FTP, SSH, Telnet SMTP, DNS, DHCP HTTP, HTTPS, POP3 ...
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