TCP/IP is based on a theoretical model developed by the Department of Defense. In computer networks, it has become the de facto standard. Discuss the relevance of TCP/IP in computer communications in depth with the use of diagrams.

Transmission Control Protocol/Internet Protocol (TCP/IP) is a suite of protocols that controls the way information travels from location to location across a network or the Internet. The protocols perform a wide array of functions. From the perspective of penetration testing, why is it important to understand TCP/IP and the layers of the Open Systems Interconnection (OSI) model?

What is the difference between OSI and TCP/IP protocol models? Justify your claim with evidence.

Define a TCP connection and discuss its significance. Although TCP connections are used, does this mean that the Internet is not a connection-based packet-switched network?