, , DNS , proxy- , (firewall), (provider)
Proxy - , . proxy , . proxy Web- . proxy, . , proxy . proxy .
- , , . , . . , - , , . , "" , / IP- . , , .
.
, . , .. . .
. , , , - . - , , Windows 2000, Windows XP proxi .
. - , . :
(Internet access providers - ISP)
(online service providers - OSP).
ISP , (, AT$T, Sprint MCI ). , ( WorldNet , ..)
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OSP, " ", , , , . , OSP Microsoft - Microsoft, America Online, IBM .
ISP- .
" " POP (point-of-presence) , .
NAP (Network Access Points), , .
, NAP, .
2.
, .
, . - . , , . , :
(, Ethernet)
DSL,,
.
, .
DSL-
DSL , . DSL DSL, . , .
DSL :
ADSL (Asymmetric Digital Subscriber Line )
HDSL (High data rate Digital Subscriber Line ),
VDSL (Very high data rate Digital Subscriber Line ) .
DSL . , ADSL 1,5 8 /, 640 / 1,5 /. VDSL 13 52 /, 1,5 2,3 / ( VDSL 13 26 /).
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DSL , .
, ADSL 3 8 /, 6 1,5 /. VDSL 52 / 300 , 13 / 1,5 . , , ( ADSL) ( VDSL) DVD.
HDSL , .
DSL . , , . .
. , . , .
, 10Base-T Ethernet USB, .
500 / 1,5 / .
. - , , .
, , . , .. . . .
. . , . , . , , (, , ).
, ( 400 / ) . , , , , 70 .
, , , , .