OSI model - 7 vrstiev
Layer 7 Application (FTP, TELNET, SMTP, HTML)
Layer 6 Presentation (GIF, JPEG, ASCII, MPEG)
Layer 5 Session (DB SQL, NetBIOS Name Queries, NetBEUI)
Layer 4 Transport (TCP, UDP, SPX)
Layer 3 Network (IP, IPX)
Layer 2 Data Link (Ethernet, ISDN, PPP)
Layer 1 Physical (RJ-45, RS-232, V.24, V.35)
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