A network is not secure until servers can identify the computers communicating with them. IPSec enables secure, trusted communications between IP addresses. The system behind the IP address has an identity that is verified by using an authentication process. The only computers that must be aware of IPSec are the sending and receiving computers. Each computer handles security at its respective end, and assumes that the medium over which the communication takes place is not secure. Any computers that route data between the source and destination computer are not required supporting IPSec.
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