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VPNs - Virtual Private Networks

Virtual Private Network Concepts and Implementations An extensive overview of Virtual Private Networks (VPNs), defining them as a network security technology that creates a secure, private tunnel over public infrastructure. It emphasizes that VPNs rely on tunneling and protocols like IPSec to ensure privacy and data integrity through encryption and hashing algorithms. The text systematically presents various classifications of VPNs based on deployment, OSI layers, trust level, and security, while also listing significant advantages such as cost savings and scalability. Finally, the source details the two main types of VPNs: Site-to-Site VPNs, which connect entire networks (like branch offices to a main office), and Remote-Access VPNs, which connect individual users or hosts securely to a private network, often utilizing client software like Cisco AnyConnect or SSL for connection.