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VPN - Virtual Private Network
Connecting or accessing a private network from other private network over internet
Leased -Dedicated Lines
A leased line is a reserved circuit between two communication points that is always active and rented for a monthly fee. Leased lines are dedicated, meaning that any bandwidth associated with the leased line is solely for private, organizational use.
Fixed Bandwidth, Stable connection,
T1 line - 1.544 Mbps
E1 line - 2.048 Mbps
Broadband internet - Up to 50Mbps, Up to 100Mbps


VPN - Virtual Private Network
— a service that helps you stay private online.
A VPN establishes a secure, encrypted connection between your computer
and the internet, providing a private tunnel for your data and
communications while you use public networks.
Tunnels:
PPTP
SSTP
L2TP
IKE

IPSec
MS CHAPv2
Radius server, AD server, AAA server - user authenticating and authorizing

A VPN uses end-to-end encryption to provide you with online privacy and security.
It routes your data through an encrypted tunnel, so nobody can see what
you're doing it on the internet and expose your identity. Even if hackers
intercepted your encrypted traffic, they wouldn't be able to view its content
VPN is safe and cheaper than leased lines
User connect to remote infrastructure like connecting in Local Network
where we cant able to use leased line connection, there VPN works



VPN Servers:
Firewall - pfsense, Palo Alto., Dell Sonicwall TZ300 VPN, TP-Link SafeStream
D-link 8-port Gigabit VPN Router
VPN Router

MS Windows Server - RRAS/RA(Remote Access)
Linux Server

The four main types of VPN are:
Remote access VPNs.
Personal VPN services.
Mobile VPNs.
Site-to-site VPNs
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