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Common Ports & Protocols.

Essential knowledge of network ports, protocols, and their security implications.

Common Ports & Protocols illustration

Cybersecurity Topic

Network PortsProtocolsSSHFTPHTTPHTTPSDNSRDP

Understanding common network ports and protocols is fundamental for network security. Each port represents a potential entry point for attackers.

Critical Ports

  • SSH (22): Secure Shell for encrypted remote access. Always use key-based authentication.
  • HTTP/HTTPS (80/443): Web traffic. Always redirect HTTP to HTTPS.
  • DNS (53): Can be used for data exfiltration and C2 communication.
  • RDP (3389): Frequently targeted for brute force attacks. Restrict access strictly.
  • SMB (445): Used by ransomware like WannaCry. Never expose to the internet.

Security Best Practices

  • Only expose necessary ports
  • Use firewalls to restrict access
  • Monitor port activity
  • Disable unused services
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