, . :
- - DoS- (Denial of Service)
. , . , . TCP/IP SYN-, , -, , . , .
. 1.4. DoS-
- - "man in the middle"
, .
. 1.5. "man in the middle"
- ()
( ) .
. 1.6.
- replay-. replay- , , , .
. 1.7. Replay-
, , TCP/IP, OSI. , TCP/IP, , , -, Internet , -, TCP/IP .