This course explores the design, architecture, capabilities, and security of the TCP/IP protocol stack by looking at its history, development, and current applications. The course also explores how TCP/IP has supported the growth of the Internet, Internet of Things (IoT), and next-generation wireless networks and services. The TCP/IP model, standards, and key architectural principles that support data flow are examined through familiarization with the full TCP/IP v4 and v6 protocol suites. Students explore TCP/IP capabilities, addressing/subnetting, performance, and cybersecurity issues. The course also covers security-specific protocols to support secure network communications, user identity protection, and the security aspects of all other protocols. Students will examine secure VPN services and mechanisms for personal and business Internet connectivity. The course concludes with a survey of modern topics including Real-Time Communications and IPv6.