How many layers make up the TCP/IP model?

 The TCP/IP model is a four-layer model that describes how data is transmitted over a network. The four layers are: Application, Transport, Internet, and Network Access. The Application layer provides services and protocols for applications to communicate with each other. The Transport layer provides reliable or unreliable data delivery between hosts. The Internet layer provides routing and addressing of packets across networks. The Network Access layer provides physical and logical access to the network media. References: Training & Certification | Check Point Software, Check Point Resource Library