N10-009 ports

Port 80

Unencrypted web browsing

Port 443

HTTPS - secure web browsing with TLS/SSL

Port 20/21

FTP (File Transfer Protocol) - transfers files

Port 22

SSH (Secure Shell) - secure remote login/Secure file transfer

Port 69

TFTP (Trivial FTP) - simple, no-auth file transfer

Port 989/990

FTPS - FTP with TLS/SSL

Port 445

SMB - Windows file and printer sharing

Port 25

SMTP - sends email between servers

Port 110

POP3 - downloads email, deletes from server

Port 995

POP3S - secure POP3

Port 143

IMAP - retrieves email, keeps it on server

Port 993

IMAPS - secure IMAP

Port 22

SSH (Secure Shell) - secure remote login

Port 23

Telnet - insecure remote login

Port 3389

RDP (Remote Desktop Protocol) - Windows remote GUI

Port 53

DNS - translates domain names ↔ IP addresses

Port 67=server/68=client

DHCP - automatic IP assignment

Port 123

NTP - synchronizes clocks

Port 514

Syslog - centralized log collection

Port 161

SNMP - queries network devices

Port 162

SNMP Traps - device alerts to monitoring system

Port 389

LDAP - directory services (users, groups)

Port 636

LDAPS - secure LDAP (TLS/SSL)

Port 1812

RADIUS Authentication - AAA login verification

Port 1813

RADIUS Accounting - tracks logins/sessions

Port 49

TACACS+ - Cisco AAA authentication

Port 5060

SIP - VoIP call setup (unencrypted)

Port 5061

SIP Secure - VoIP over TLS

Port 1720

Legacy VoIP/video