These lecture notes and excerpts cover various aspects of computer architecture and networking. Lecture 1 introduces network fundamentals, the OSI model, and data coding (decimal, binary, hexadecimal, ASCII). Lecture 5 focuses on wireless technologies (infrared, Bluetooth, WiFi) and LAN equipment. Lecture 8 details support protocols like ARP and DHCP, IP addressing, and NAT. Lecture 9 discusses IPv6 and its advantages over IPv4. Lecture 11 explores encryption methods and HTTP(S). Finally, other documents provide supplementary material on data communication, packet switching, transmission media, error detection/correction, multiplexing, and cloud computing.