Network Basics for Hackers, Part 01: IP Addresses, Ports, NAT, and DHCP https://hackers-arise.com/networking-basics-for-hackers-part-1/
Network Basics for Hackers, Part 02: TCP/IP https://hackers-arise.com/networking-basics-for-hackers-part-2/
Network Basics for Hackers, Part 03: Subnetting, Network Masks, and CIDR Basics https://hackers-arise.com/network-basics-for-hackers-part-3-subnetting-network-masks-and-cidr-basics/