<P> Although both models use the same term for their respective highest level layer, the detailed definitions and purposes are different . </P> <P> In TCP / IP, the application layer contains the communications protocols and interface methods used in process - to - process communications across an Internet Protocol (IP) computer network . The application layer only standardizes communication and depends upon the underlying transport layer protocols to establish host - to - host data transfer channels and manage the data exchange in a client - server or peer - to - peer networking model . Though the TCP / IP application layer does not describe specific rules or data formats that applications must consider when communicating, the original specification (in RFC 1123) does rely on and recommend the robustness principle for application design . </P> <P> In the OSI model, the definition of the application layer is narrower in scope . The OSI model defines the application layer as the user interface responsible for displaying received information to the user . In contrast, the Internet Protocol model does not concern itself with such detail . OSI also explicitly distinguishes additional functionality below the application layer, but above the transport layer at two additional levels: the session layer, and the presentation layer . OSI specifies a strict modular separation of functionality at these layers and provides protocol implementations for each layer . </P> <Table> <Tr> <Th> Internet protocol suite </Th> </Tr> <Tr> <Th> Application layer </Th> </Tr> <Tr> <Td> <Ul> <Li> BGP </Li> <Li> DHCP </Li> <Li> DNS </Li> <Li> FTP </Li> <Li> HTTP </Li> <Li> IMAP </Li> <Li> LDAP </Li> <Li> MGCP </Li> <Li> NNTP </Li> <Li> NTP </Li> <Li> POP </Li> <Li> ONC / RPC </Li> <Li> RTP </Li> <Li> RTSP </Li> <Li> RIP </Li> <Li> SIP </Li> <Li> SMTP </Li> <Li> SNMP </Li> <Li> SSH </Li> <Li> Telnet </Li> <Li> TLS / SSL </Li> <Li> XMPP </Li> <Li> more...</Li> </Ul> </Td> </Tr> <Tr> <Th> Transport layer </Th> </Tr> <Tr> <Td> <Ul> <Li> TCP </Li> <Li> UDP </Li> <Li> DCCP </Li> <Li> SCTP </Li> <Li> RSVP </Li> <Li> more...</Li> </Ul> </Td> </Tr> <Tr> <Th> Internet layer </Th> </Tr> <Tr> <Td> <Ul> <Li> IP <Ul> <Li> IPv4 </Li> <Li> IPv6 </Li> </Ul> </Li> <Li> ICMP </Li> <Li> ICMPv6 </Li> <Li> ECN </Li> <Li> IGMP </Li> <Li> IPsec </Li> <Li> more...</Li> </Ul> </Td> </Tr> <Tr> <Th> Link layer </Th> </Tr> <Tr> <Td> <Ul> <Li> ARP </Li> <Li> NDP </Li> <Li> OSPF </Li> <Li> Tunnels <Ul> <Li> L2TP </Li> </Ul> </Li> <Li> PPP </Li> <Li> MAC <Ul> <Li> Ethernet </Li> <Li> DSL </Li> <Li> ISDN </Li> <Li> FDDI </Li> </Ul> </Li> <Li> more...</Li> </Ul> </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table>

What is the application layer in osi model
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