The TCP/IP protocol suite establishes the technical foundation of the Internet. Development of the TCP/IP started as DOD projects. Now, most protocols in the suite are developed by the Internet Engineering Task Force (IETF) under the Internet Architecture Board (IAB), an organization initially sponsored by the US government and now an open and autonomous organization. The IAB provides the coordination for the R&D underlying the TCP/IP protocols and guides the evolution of the Internet. The TCP/IP protocols are well documented in the Request For Comments (RFC), which are drafted, discussed, circulated and approved by the IETF committees. All documents are open and free and can be found online in the IETF site listed in the reference.
TCP/IP architecture does not exactly match the OSI model. Unfortunately, there is no universal agreement regarding how to describe TCP/IP with a layered model. It is generally agreed that TCP/IP has fewer levels (from three to five layers) than the seven layers of the OSI model. In this document, we force TCP/IP protocols into the OSI 7 layers structure for comparison purpose.
The TCP/IP suite's core functions are addressing and routing (IP/IPv6 in the networking layer) and transportation control (TCP, UDP in the transport layer).
IP - Internet Protocol Addressing of network components is a critical issue for information routing and transmission in network communications. Each technology has its own convention for transmitting messages between two machines within the same network. On a LAN, messages are sent between machines by supplying the six bytes unique identifier (the "MAC" address). In an SNA network, every machine has Logical Units with their own network addresses. DECNET, AppleTalk, and Novell IPX all have a scheme for assigning numbers to each local network and to each workstation attached to the network.
On top of these local or vendor specific network addresses, IP assigns a unique number to every network device in the world, which is called an IP address. This IP address is a four-byte value in IPv4 that, by convention, is expressed by converting each byte into a decimal number (0 to 255) and separating the bytes with a period. In IPv6, the IP address has been increased to 16 bytes. Details of the IP and IPv6 protocols are presented in separate documents.
TCP - Transmission Control Protocol TCP provides a reliable stream delivery and virtual connection service to applications through the use of sequenced acknowledgment with retransmission of packets when necessary. TCP provides stream data transfer, transportation reliability, efficient flow control, full-duplex operation, and multiplexing. Check the TCP section for more details. In the follwoing TCP/IP protocol stack table, we list all the protocols according to their functions in mapping to the OSI 7 layers network communication reference model.
However, the TCP/IP architecture does not follow the OSI model closely, for example, most TCP/IP applications directly run on top of the transport layer protocols, TCP and UDP, without the presentation and session layers in between.
TCP/IP Protocol Stack
Application Layer
BOOTP: Bootstrap Protocol
DCAP: Data Link Switching Client Access Protocol
DHCP: Dynamic Host Configuration Protocol
DNS: Domain Name Systems
FTP: File Transfer Protocol
Finger: User Information Protocol
HTTP: Hypertext Transfer Protocol
S-HTTP: Secure Hypertext Transfer Protocol (S-HTTP)
IMAP & IMAP4: Internet Message Access Protocol
IPDC: IP Device Control
IRCP (IRC): Internet Relay Chat Protocol
LDAP: Lightweighted Directory Access Protocol
MIME (S-MIME): Multipurpose Internet Mail Extensions (Secure MIME)
NAT: Network Address Translation
NNTP: Network News Transfer Protocol
NTP: Network Time Protocol
POP & POP3: Post Office Protocol (version 3)
rlogin: Remote Login in Unix
RMON: Remote Monitoring MIBs in SNMP
SLP: Service Location Protocol
SMTP: Simple Mail Transfer Protocol
SNMP: Simple Network Management Protocol
SNTP: Simple Network Time Protocol
Syslog Protocol
TELNET: TCP/IP Terminal Emulation Protocol
TFTP: Trivial File Transfer Protocol
URL: Uniform Resource Locator
XMPP: Extensible Messaging and Presence Protocol
X-Window: X Window or X Protocol or X System
Presentation Layer LPP: Lightweight Presentation Protocol
Session Layer RPC: Remote Procedure Call protocol
Transport Layer
ITOT: ISO Transport Over TCP/IP
RDP: Reliable Data Protocol
RUDP: Reliable UDP
TALI: Transport Adapter Layer Interface
TCP: Transmission Control Protocol
UDP: User Datagram Protocol
Van Jacobson: Compressed TCP
Network Layer Routing
BGP/BGP-4: Border Gateway Protocol
EGP: Exterior Gateway Protocol
IP: Internet Protocol
IPv6: Internet Protocol version 6
ICMP/ICMPv6: Internet Control Message Protocol
IRDP: ICMP Router Discovery Protocol
Mobile IP: IP Mobility Support Protocol for IPv4 & IPv6
NARP: NBMA Address Resolution Protocol
NHRP: Next Hop Resolution Protocol
OSPF: Open Shortest Path First
RIP (RIP2): Routing Information Protocol
RIPng: RIP for IPv6
RSVP: Resource ReSerVation Protocol
VRRP: Virtual Router Redundancy Protocol
Multicast
BGMP: Border Gateway Multicast Protocol
DVMRP: Distance Vector Multicast Routing Protocol
IGMP: Internet Group Management Protocol
MARS: Multicast Address Resolution Server
MBGP: Multiprotocol BGP
MOSPF: Multicast OSPF
MSDP: Multicast Source Discovery Protocol
MZAP: Multicast-Scope Zone Announcement Protocol
PGM: Pragmatic General Multicast Protocol
PIM-DM: Protocol Independent Multicast - Dense Mode
PIM-SM: Protocol Independent Multicast - Sparse Mode
MPLS Protocols
MPLS: Multi-Protocol Label Switching
CR-LDP: Constraint-Based Label Distribution Protocol
LDP: Label Distribution Protocol
RSVP-TE: Resource ReSerVation Protocol-Traffic Engineering
GMPLS: Generalized Multi-Protocol Lable Switching
Data Link Layer
ARP and InARP: Address Resolution Protocol and Inverse ARP
IPCP and IPv6CP: IP Control Protocol and IPv6 Control Protocol
RARP: Reverse Address Resolution Protocol
SLIP: Serial Line IP
Related protocol suites LAN, MAN, WAN, SAN, Security/VPN
Sponsor Source IETF, DARPA, ISO
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