Protocols and Ports
What Are Protocols? What Are Ports? Common Protocols & Ports Protocol Port Transport Use HTTP 80 TCP Web traffic (unencrypted) HTTPS 443 TCP Secure web traffic FTP 21 TCP File transfer SMTP 25 TCP Sending email DNS 53 UDP/TCP Domain name resolution SSH 22 TCP Secure remote login Telnet 23 TCP Remote login (insecure, legacy) SNMP 161 UDP Network management NTP 123 UDP Time synchronization How Protocols & Ports Work Together Security Considerations Summary:
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