IPsec
IPsec (Internet Protocol Security) is a suite of protocols that provides secure communication over IP networks by authenticating and encrypting each IP packet in a data stream. It operates at the network layer (Layer 3) of the OSI model, enabling end-to-end security for applications without requiring modifications to the applications themselves. IPsec is commonly used to create Virtual Private Networks (VPNs) and secure data transmission over untrusted networks like the internet.
Developers should learn IPsec when building secure network applications, implementing VPN solutions, or ensuring data confidentiality and integrity in enterprise or cloud environments. It is essential for scenarios requiring encrypted communication between remote offices, secure remote access for employees, or protecting sensitive data in transit over public networks. Knowledge of IPsec is particularly valuable for roles in network security, DevOps, and systems engineering where secure connectivity is critical.