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All things you need to know about network ports for CompTIA A+ exam
File Transfer Protocol (FTP)—Data Connection
20; Make files available for download across a network (data connection port)
File Transfer Protocol (FTP)—Control connection
21; Make files available for download across a network (control connection port)
Secure Shell (SSH)
22; Make a secure connection to the command-line interface of a server.
Telnet
23; Make an unsecure connection to the command-line interface of a server.
Simple Mail Transfer Protocol (SMTP)
25; Transfer email messages across a network.
Domain Name System (DNS)
53; Facilitate identification of hosts by name alongside IP addressing.
Dynamic Host Configuration Protocol (DHCP) Server
67; Provision an IP address configuration to clients.
DHCP Client
68; Request a dynamic IP address configuration from a server.
HyperText Transfer Protocol (HTTP)
80; Provision unsecure websites and web services.
Post Office Protocol (POP)
110; Retrieve email messages from a server mailbox.
NetBIOS over TCP/IP
137/139; Support networking features of legacy Windows versions.
Internet Mail Access Protocol (IMAP)
143; Read and manage mail messages on a server mailbox.
Simple Network Management Protocol (SNMP)
161; Query status information from network devices.
SNMP trap operation
162; Report status information to a management server.
Lightweight Directory Access Protocol (LDAP)
389; Query information about network users and resources.
HTTP Secure (HTTPS)
443; Provision secure websites and services.
Server Message Block (SMB)
445; Implement Windows-compatible file and printer sharing services on a local network (also sometimes referred to as Common Internet File System [CIFS])
Remote Desktop Protocol (RDP)
3389; Make a secure connection to the graphical desktop of a computer.
