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OSI TCP-IP.pptx
- 2. Introduction OSI OSI History OSI Layers Introduction TCP/IP TCP/IP Layers OSI vs. TCP/IP Model 2
- 3. The Open System Interconnection Reference Model (OSI Reference Model or OSI Model) is an abstract description for layered communications and computer network protocol design. It divides network architecture into seven layers which, from top to bottom, are the Application, Presentation, Session, Transport, Network, Data Link, and Physical Layers. It is therefore often referred to as the OSI Seven Layer Model. 3
- 4. In 1978, the International Standards Organization (ISO) began to develop its OSI framework architecture. OSI has two major components: an abstract model of networking, called the Basic Reference Model or seven-layer model, and a set of specific protocols. 4
- 5. OSI Model Data unit Layer Function Host layers Data 7. Application Network process to application 6. Presentation Data representation, encryption and decryption 5. Session Interhost communication Segment s 4. Transport End-to-end connections and reliability, Flow control Media layers Packet 3. Network Path determination and logical addressing Frame 2. Data Link Physical addressing Bit 1. Physical Media, signal and binary transmission 5
- 6. DATA FLOWS DOWN FROM UPPER LAYERS TO LOWER LAYERS 6
- 7. The Internet Protocol Suite (commonly known as TCP/IP) is the set of communications protocols used for the Internet and other similar networks. It is named from two of the most important protocols in it: the Transmission Control Protocol (TCP) and the Internet Protocol (IP), which were the first two networking protocols defined in this standard. 7
- 8. OSI TCP/IP Application Layer Application Layer TELNET, FTP, SMTP, POP3, SNMP, NNTP, DNS,NIS, NFS, HTTP, ... Presentation Layer Session Layer Transport Layer Transport Layer TCP , UDP , ... Network Layer Internet Layer IP , ICMP, ARP, RARP, ... Data Link Layer Link Layer FDDI, Ethernet, ISDN, X.25,... Physical Layer 8
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- 11. Layer Protocol Application DNS, TFTP, TLS/SSL, FTP, Gopher, HTTP, IMAP, IRC, NNTP, POP3, SIP, SMTP, SMPP, SNMP, SSH, Telnet, Echo, RTP, P NRP, rlogin, ENRP Routing protocols like BGP and RIP which run over TCP/UDP, may also be considered part of the Internet Layer. Transport TCP, UDP, DCCP, SCTP, IL, RUDP, RSVP Internet IP (IPv4, IPv6), ICMP, IGMP, and ICMPv6 OSPF for IPv4 was initially considered IP layer protocol since it runs per IP-subnet, but has been placed on the Link since RFC 2740. Link ARP, RARP, OSPF (IPv4/IPv6), IS-IS, NDP 11