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The five-layer TCP/IP model 5. Application layer DHCP Â· DNS Â· FTP Â· Gopher Â· HTTP Â· NFS Â· NTP Â· (more) 4. Transport layer TCP Â· UDP Â· DCCP Â· SCTP Â· RTP Â· RSVP Â· IGMP Â· IS-IS Â· IGRP Â· EIGRP 2. Data Link layer PPP Â· SLIP 1. Physical layer RS-232 Â· V.35Â· V.34Â· I.430Â· I.431Â· T1Â· E1Â· 10BASE-TÂ· 100BASE-TXÂ· POTSÂ· SONETÂ· DSLÂ· 802.11a/b/g/n PHY This box: view â€¢ talk â€¢ edit This article is about the data-oriented protocol. For the set of communications protocols, see Internet protocol suite. The Internet Protocol (IP) is a data-oriented protocol used for communicating data across a packet-switched internetwork. IP is a network layer protocol in use today is IPv4; this version of the protocol is assigned version 4. IPv4 is described in RFC-791 (1981). IPv6 is the proposed successor to IPv4 whose most prominent change is the addressing. IPv4 uses 32-bit addresses (~4 billion addresses) while IPv6 uses 128-bit addresses (~3.4Ã—1038 addresses). Although adoption of IPv6 has been slow, as of 2008, all United States government systems must support IPv6 (if only at the backbone level). [3] Version numbers 0 through 3 were development versions of IPv4 used between 1977 and 1979. Version number 5 was used by the Internet Stream Protocol (IST), an experimental stream protocol. Version numbers 6 through 9 were assigned to experimental protocols designed to replace IPv4: SIPP (known nowadays as IPv6),