COMPTIA A+, Core 1, Common Ports

Port 20

TCP, FTP Data, File Transfer Protocol

Port 21

TCP, FTP Control, File Transfer Protocol

Port 22

TCP, SSH, Secure Shell

Port 23

TCP, Telnet

Port 25

TCP, SMTP, Simple Mail Transfer Protocol

Port 53

TCP/UDP, DNS, Domain Name System

Port 67

UDP, bootps, BOOTP/DHCP Server

Port 68

UDP, bootpc, BOOTP/DHCP Client

Port 80

TCP, HTTP, Hyper Text Transfer Protocol

Port 110

TCP, POP3, Post Office Protocol

Port 123

UDP, NTP, Network Time Protocol

Port 137-139

UDP/TCP, Netbt, NetBIOS over TCP/IP

Port 143

TCP, IMAP4, Internet Mail Access Protocol

Port 161

UDP, SNMP, Simple Network Management Protocol

Port 162

UDP, SNMP-Trap, Simple Network Management Protocol Trap

Port 389

TCP, LDAP, Lightweight Directory Access Protocol

Port 427

TCP, SLP, Service Location Protocol

Port 443

TCP, HTTPS, Hyper Text Transfer Protocol Secure

Port 445

TCP, SMB, Secure Message Block/Common Internet File System

Port 548

TCP, AFP, Apple Filing Protocol

Port 3389

TCP, RDP, Remote Desktop Protocol