Definition
TCP/IP, also known as the Internet protocol suite, is a foundational set of communication protocols used for the internet and similar computer networks. It defines how data should be packetized, addressed, transmitted, routed, and received, enabling diverse devices to communicate reliably. This suite operates in layers, with the Transmission Control Protocol (TCP) ensuring reliable data delivery and the Internet Protocol (IP) handling addressing and routing. Understanding TCP/IP is crucial for network administrators and security professionals to troubleshoot connectivity issues, configure network devices, and implement effective security measures. For instance, when you browse a website, your browser uses TCP/IP to request and receive the web page data from the server. It is distinct from the OSI model, which is a conceptual framework rather than a practical implementation. Knowledge of TCP/IP is frequently tested on certifications like CompTIA Security+, Network+, and CISSP.