VPN :
- ;
- ;
- .
- PPTP (Point to Point Tunneling Protocol) - IP - . PPP.
- L2TP (Layer 2 Tunneling Protocol) - SLIP PPP. IP, , ATM, X.25 Frame Relay.
- MPLS (Multiprotocol Label Switching) - , . , . MPLS , IP-, ATM, SONET Ethernet.
:
- IPSec - . IPSec :
AH (Authentication Header) - .
ESP (Encapsulating Security Payload) - , , .
IKE (Internet Key Exchange) - , .
:
- SSL/TLS (Secure Socket Layer/Transport Layer Security) - . TCP - , UDP.
44. VPN-
VPN . : , , ; .
dial networks Remote Access VPN:
dial-in numbers ;
;
, ;
- .
VPN Internet , -.
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Intranet VPN:
;
, ;
, .
VPN , , , , .
Extranet VPN , . Extranet VPN VPN-, VPN-, .
, , . . . , , , . , .
Extranet VPN , , Intranet VPN Remote AccessVPN. , , Extranet VPN, .