🏢🔗 A site-to-site VPN (Virtual Private Network) securely connects entire networks—like a company’s headquarters and its branch offices—over the internet, making them function as if they’re part of the same local network.

🧩 What Site-to-Site VPN Does

• Creates a secure, encrypted tunnel between two or more networks
• Allows resource sharing (files, databases, applications) across locations
• Enables centralized access to corporate systems from remote offices
• Reduces reliance on expensive leased lines by using the public internet securely

🛠️ How It Works

• Each site has a VPN gateway (usually a router or firewall)
• These gateways establish a tunnel using protocols like IPsec
• Data travels through this tunnel, encrypted and protected from outsiders
• Routing tables ensure traffic flows correctly between networks

🧠 Real-World Analogy

Imagine two office buildings in different cities:

• A site-to-site VPN is like building a private underground tunnel between them
• Employees in either building can walk through the tunnel to access shared resources—securely and seamlessly

✅ Benefits

• Enhanced security for inter-office communication
• Simplified collaboration across locations
• Cost-effective compared to dedicated private lines