Glossary: Hardening, Firewalls and Intrusion Detection

TCP (Transmission Control Protocol)

Also written: TCP, tcp dport

One of the two common ways to carry data between programs, using connections and numbered ports. In nftables, "tcp dport" means the TCP destination port.

Where the book teaches it

Chapter 5: Intrusion Detection and Prevention
Chapter 6: Firewalls

Related terms

UDP (User Datagram Protocol)Port Layer 4 firewall