( ) . .
OSI :
- ;
- ;
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- .
3- , .. , . , , , IP . , , . , ( ), .. .
. 4 OSI. Check Point . , IP- , . , , 7 . 90- : FTP, SMTP, Telnet .
80- DEC
(VPN)
VPN (. Virtual Private Network ) , ( ) (, ). , (, ), (, , , ).
, VPN : -, - -.
VPN :
. , , . VPN : IPSec, OpenVPN PPTP.
( )
, . . VPN : Multi-protocol label switching (MPLS) L2TP (Layer 2 Tunnelling Protocol) ( , , L2TP, , IPSec).
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VPN
- IPSec (IP security) IPv4.
- PPTP (point-to-point tunneling protocol) , Microsoft.
- L2TP (Layer 2 Tunnelling Protocol) Microsoft Cisco.
- OpenVPN SSL VPN , PPP, bridge, point-to-point, multi-client server
VPN- -.
. (Virtual Private Network) , . VPN , . VPN. VPN , , - .
VPN , . VPN :
- ;
- ;
- .
VPN VPN . VPN , , . VPN , .
. - , () . () (). , . , , IP- .
IDS ( Intrusion Detection System ) (), , .
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, . , , , , ( , )
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DLP ( , . Data Leak Prevention, DLP) , ( -) .
DLP- , . , (, , ) .
DMZ ( ,) , , , ( ) (), , .
Honeypot (́) (. ) , . Honeypot , , . Honeypot , - . . Honeypot , , , - , .