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Define the required fields of VPN:
RSA:
A public-key cryptosystem for encryption and authentication.
Preshared Key:
The IKE VPN must be defined with a Preshared Key. The Key may be up to
128 bytes long.
ISAKMP (Internet Security Association Key Management Protocol):
An extensible protocol-encoding scheme that complies to the Internet Key
Exchange (IKE) framework for establishment of Security Associations
(SAs).
Main Mode:
This is another first phase of the Oakley protocol in establishing a security
association, but instead of using three packets like in aggressive mode, it
uses six packets.
Aggressive mode:
This is the first phase of the Oakley protocol in establishing a security
association using three data packets.
AH (Authentication Header):
One of the IPSec standards that allows for data integrity of data packets.
ESP (Encapsulating Security Payload):
One of the IPSec standards that provides for the confidentiality of data
packets.
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