Five Network Protocols Cybersecurity Beginners Should Understand

Summary

A beginner’s guide to HTTP, TCP, UDP, SMTP and FTP explains how they work and why they matter for security, including TLS protection, email safeguards, DDoS amplification and the risks of unencrypted FTP.

Key points

• HTTP uses a request–response model; HTTPS adds TLS encryption to help protect web traffic from interception or tampering.
• TCP establishes connections with a three-way handshake and provides reliable, ordered data delivery.
• UDP sends datagrams without connection setup or delivery guarantees and can be abused in DDoS amplification attacks.
• SMTP transfers email, while IMAP and POP3 are used to retrieve it; SPF, DKIM and DMARC provide additional email protections.
• Traditional FTP does not encrypt usernames, passwords or files, so the article highlights the risks of exposed FTP services and recommends secure alternatives.