What is a VPN and what are the main virtual private network protocols?

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A VPN, or Virtual Private Network, is a technology that allows you to create a secure encrypted connection over a public network, such as the internet. It encapsulates all transmitted traffic into a special wrapper and encrypts it, protecting data from interception and analysis by malicious actors even when using open Wi-Fi access points in public places.

Modern VPN technologies use various protocols to establish connections and protect information. The choice of a specific solution depends on requirements for speed, security, and the complexity of setting up the network infrastructure. The main protocols can be divided into several categories:

1. IPsec — a classic network-layer protocol that provides a high level of security and is often used to create permanent secure tunnels between company branches.
2. OpenVPN — a flexible SSL/TLS-based protocol that operates at layers 3 and 4, supports numerous encryption algorithms, and easily bypasses most firewalls.
3. WireGuard — a modern lightweight protocol known for high performance, minimal code base, and fast connection establishment.
4. L2TP with IPsec encryption — an aging solution often used to connect user devices to corporate networks due to built-in operating system support.

Using a VPN is critical for enabling remote work when secure access to an organization's internal resources from home or during a business trip is required. Additionally, the technology is used to unite geographically distributed offices into a single corporate network with unified security rules.

What is a VPN and what are the main virtual private network protocols?

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