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web_java GNS3 Appliance:
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The IP security (IPSec) is an Internet Engineering Task Force (IETF) standard suite of protocols between 2 communication points across the IP network that provide data authentication, integrity, and confidentiality. It also defines the encrypted, decrypted and authenticated packets. Site to Site
A site-to-site VPN allows offices in multiple fixed locations to establish secure connections with each other over a public network such as the internet.
A virtual private network extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network.