What is VPN

• VPN → Virtual Private Network
  • Virtual: as if there is a direct private connection between two ends (VPN server & VPN client)
  • Private: secure and encrypted connections to provide greater privacy (establishes a protected network connection over public internet)
  • Network: connection between two ends (VPN server ↔ VPN client)
• VPN is a secure, encrypted connection between two networks or between an individual user and a network
• VPN is a private network that encrypts and transmits data over the internet (a logical connection between two devices i.e. sender and receiver)
• VPN is an encrypted connection over the Internet from a device to a network
• VPN gives an encrypted and secure path called tunnel from source end to destination end over the internet
• VPN has the implementation of secure network using switching or routing capabilities
• VPN connects your PC, smartphone, or tablet to another computer (called a server) somewhere on the internet

Types

• P2S:
  • Point-to-Site VPN (also known as ‘Remote Access VPN’)
  • Example: connecting laptop to office network from home
• S2S:
  • Site-to-Site VPN (also known as router-to-router VPN)
  • Example: connecting on-premise network to Azure vNet

Conponents

• VPN server
• VPN client:
  • In P2S, it’s an application
  • In S2S, a router acts as client
• Tunnel: encrypted connection across the Internet

Usage of VPN

• Anonimity (don’t get tracked)
  • Hide IP address and location
  • Hide web activity
  • Hide browsing history
  • Hide location for streaming
• Access blocked websites
• Cross-premise network
  • Connect on-premise network to cloud virtual network i.e. Azure vNet
  • Hybrid cloud solution i.e. infrastructures are in both on-premise & cloud
• Conneting to office network from home securely
• Connecting different office networks of a company