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HTTP
Unencrypted web traffic (port 80)
HTTPS
Encrypted web traffic using TLS (port 443)
FTP
File transfer protocol (insecure, port 21)
SFTP
Secure file transfer over SSH (port 22)
SSH
Secure remote command-line access (port 22)
Telnet
Insecure remote command-line access (port 23)
SMTP
Sends email between servers (port 25)
POP3
Downloads email to a client (port 110)
IMAP
Syncs email across devices (port 143)
DNS
Resolves hostnames to IP addresses (port 53)
DHCP
Automatically assigns IP addresses (ports 67/68)
SNMP
Monitors network devices (port 161)
LDAP
Directory services and authentication (port 389)
LDAPS
Secure LDAP using encryption (port 636)
RDP
Remote desktop access to Windows systems (port 3389)
SIP
Establishes and manages VoIP calls (ports 5060/5061)
NTP
Synchronizes system time on a network (port 123)
SMB
Windows file and printer sharing (port 445)
ICMP
Network error reporting and diagnostics (ping)