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Osi Seven Layer Model


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Osi Seven Layer Model

  1. 1. OSI Seven Layer Model 49771008 蔡柔嫻
  2. 2. File Transfer Protocol <ul><li>&quot;FTP&quot; and &quot;FTP server&quot; redirect here. For other uses, see FTP (disambiguation) . </li></ul><ul><li>File Transfer Protocol ( FTP ) is a standard network protocol used to exchange and manipulate files over an Internet Protocol computer network, such as the Internet . FTP is built on a client-server architecture and utilizes separate control and data connections between the client and server applications. Client applications were originally interactive command-line tools with a standardized command syntax, but graphical user interfaces have been developed for all desktop operating systems in use today. FTP is also often used as an application component to automatically transfer files for program internal functions. FTP can be used with user-based password authentication or with anonymous user access. The Trivial File Transfer Protocol (TFTP) is a similar, but simplified, not interoperable, and unauthenticated version of FTP. </li></ul>
  3. 3. Internet Protocol <ul><li>This article is about a specific protocol technology. For the entire set of Internet related protocols, see Internet Protocol Suite . </li></ul><ul><li>The Internet Protocol ( IP ) is a protocol used for communicating data across a packet-switched internetwork using the Internet Protocol Suite , also referred to as TCP/IP. </li></ul><ul><li>IP is the primary protocol in the Internet Layer of the Internet Protocol Suite and has the task of delivering distinguished protocol datagrams (packets) from the source host to the destination host solely based on their addresses. For this purpose the Internet Protocol defines addressing methods and structures for datagram encapsulation . The first major version of addressing structure, now referred to as Internet Protocol Version 4 (IPv4) is still the dominant protocol of the Internet, although the successor, Internet Protocol Version 6 (IPv6) is being deployed actively worldwide. </li></ul>
  4. 4. Network Time Protocol <ul><li>The Network Time Protocol ( NTP ) is a protocol for synchronizing the clocks of computer systems over packet-switched , variable- latency data networks. NTP uses UDP on port 123 as its transport layer . It is designed particularly to resist the effects of variable latency by using a jitter buffer . NTP also refers to a reference software implementation that is distributed by the NTP Public Services Project . </li></ul><ul><li>NTP is one of the oldest Internet protocols still in use (since before 1985). NTP was originally designed by Dave Mills of the University of Delaware , who still maintains it, along with a team of volunteers. </li></ul>