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TCP/IP Stands for Transmission Control Protocol/Internet Protocol, the suite of communications protocols used to connect hosts on the Internet. TCP/IP uses several protocols, the two main ones being TCP and IP. TCP/IP is built into the UNIX operating system and is used by the Internet, making it the de facto standard for transmitting data over networks. Even network operating systems that have their own protocols, such as Novell Netware's IPX/SPX, also support TCP/IP.

Internet Protocol Stack in relation to the OSI Model
Layer 7: Application Layer HTTP, HTTPS, SMTP, FTP, UUCP, NNTP,
SSH, IRC, SNMP, SIP, RTP, Telnet
Layer 6: Presentation Layer AFP, Telnet, FTP, SMTP, SMB, NCP, Net RPC
Layer 5: Session Layer ASP, NetBIOS, Net RPC
Layer 4: Transport Layer TCP, UDP, SCTP, DCCP, ATP, VIPC, NetBEUI, SPX, SPP
Layer 3: Network Layer IP, IPv4, IPv6, ICMP, ARP, IGMP, DDP, VIP, IPX, IDP, CLNP, NetBEUI
Layer 2: Data Link Layer Ethernet, Wi-Fi, Token ring, FDDI, PPP, ODI, NDIS, ATM, NIC's, ARCNET
Layer 1: Physical Layer RS-232, EIA-422, RS-449, EIA-485
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