tcp/20  and tcp/21 - File Transfer Protocol (FTP): Sends and receives files between systems, tcp/22 - Secure Shell (SSH): Encrypted console access, tcp/23 - Telecommunication Network (Telnet): Insecure console access, tcp/25 - Simple Mail Transfer Protocol (SMTP): Transfer mail between mail servers, udp/53 and tcp/53 - Domain Name System (DNS): Converts domain names to IP addresses, udp/67 and udp/68 - Dynamic Host Configuration Protocol (DHCP): Automate the IP address configuration process, tcp/80 - Hypertext Transfer Protocol (HTTP): Web server communication, tcp/443 - Hypertext Transfer Protocol Secure (HTTPS): Web server communication with encryption, tcp/110 - Post Office Protocol version 3 (POP3): Receive email into a email client, tcp/143 - Internet Message Protocol v4 (IMAP4): A newer email client protocol, tcp/445 - Server Message Block (SMB): Windows file transfer and printing sharing, udp/161 - Simple Network Management Protocol (SNMP Query): Gather metrics and mange network devices, udp/162 - Simple Network Management Protocol (SNMP Trap): Receive alerts from network devices, tcp/389 - Lightweight Directory Access Protocol (LDAP): Directory Services, tcp/3389 - Remote Desktop Protocol (RDP): Graphical display of remote devices,

Common Network Ports

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