IPv4
IPv4 (Internet Protocol version 4) is a core networking protocol that provides logical addressing for devices on a network, enabling data packet routing across interconnected systems like the internet. It uses 32-bit addresses, typically expressed in dotted-decimal notation (e.g., 192.168.1.1), to uniquely identify each device. As the foundational protocol for most internet communication, it defines how data is formatted, transmitted, and received between hosts.
Developers should learn IPv4 because it underpins virtually all internet and local network communication, making it essential for network programming, system administration, and troubleshooting connectivity issues. It's crucial for tasks like configuring servers, implementing network security (e.g., firewalls), and developing applications that rely on network protocols such as TCP/IP. Understanding IPv4 is particularly important in legacy systems and environments where IPv6 adoption is incomplete.