: .
, , (virtual channel virtual circuit)
-
, - . , . , , , . , , . .
27. ?
, , . , , . ( , , , ). , , ; , ; ; .
28. TCP/IP? .
TCP/IP 4
- ( , . Telnet, FTP, TFTP, DNS, http)
- ( . TCP (Transmission Control Protocol) UDP (User Datagram Protocol)
- ( , ; , , ; - . IP (Internet Protocol), RIP (Routing Internet Protocol) OSPF (Open Shortest Path First), ICMP (Internet Control Message Protocol))
- ( . )