7 Layers of the Osi Model

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The Seven Layers of the OSI Model Kevin Ludwig Bryant and Stratton College TECH 140 Khaled Sabha 12.08.2009 There are seven layers in the OSI model. Each layer has a function or purpose that is used to set up a network. The International Organization for Standardization began to develop the OSI framework in 1984. The purpose was to have each layer interact with the layer directly beneath it. The layers are starting from the top: Application, Presentation, Session, Transport, Network, Data Link and Physical. The Application layer has the function of providing interface between software applications and network for interpreting the requests and requirements for applications. “This top layer defines the language and syntax…show more content…
The functions of hardware in the OSI model support similar to the functions of the model layers. In the OSI model there are also Protocols and Standards. “ISO defined a group of protocols for internetworking communications based on the OSI model.” (Network Protocols Handbook, 2007, p 217-218). Application consists of BOOTP, DHCP, DNS, FTP, HTTP, HTTPS, IMAP4, PING, POP3, NSLOOKUP, NTP, SFTP, SMTP, SNPM, Telnet and TFTP. The Presentation layer consists of MIME, SSL and TLS. The Network layer consists of ARP, ICMP, IGMP, IP, IPSec and RARP. The Data Link layer possesses L2TP, PPP, PPTP and SLIP. Finally the Physical layer has IEEE 802.3, 802.5, and 802.11. These protocols are the most common in the OSI model. By adhering to this standard model of communications, modem networks, including the Internet have come into existence. For anyone interested in implementing in today’s modem networks, an understanding to the OSI model and its various layers is vital. This standard of communications presents the foundations for today’s entire modern network hardware and software. References OSI MODEL. (2009). In Computer Desktop Encyclopedia (p.01). Pennsylvania: Computer Language Company Inc. Network Protocols Handbook (2007). Protocols Guide: Iso Protocols in OSI7 Layers Reference Model. P

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