File Transfer Protocol (FTP) - 20/21, Secure Shell (SSH) - 22, Telnet - 23, Simple Mail Transfer Protocol (SMTP) - 25, Domain Name Service (DNS) - 53, Dynamic Host Configuration Protocol (DHCP) - 67/68, Hypertext Transfer Protocol (HTTP) - 80, Post Office Protocol 3 (POP3) - 110, NetBIOS/NetBT - 137/139, Internet Mail Access Protocol (IMAP) - 143, Simple Network Management Protocol (SNMP) - 161/162, Lightweight Directory Access Protocol (LDAP) - 389, Hypertext Transfer Protocol Secure (HTTPS) - 443, Server Message Block/Common Internet File System - 445, Remote Desktop Protocol (RDP) - 3389, SMTP/Transport Layer Security (TLS) - 587, IMAP4/Transport Layer Security (TLS) - 993, SMTP/SSL - 465,

CompTIA A+ Core 1 Port Numbers

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