W14webposter

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W14webposter

  1. 1. How Corporate Firewalls Work ・Firewall ・ FTP ・Packet ・Router
  2. 2. Firewall Firewall is software that control connect computer network with outside of network. Firewall can be divided into some types by OSI. Packet filters type works on network layer and transport layer. Circuit level gateway type works on transport layer. This type is added to hardware as part of the function. Application gateway type works on application layer.
  3. 3. FTP The FTP is abbreviation of File Transfer Protocol. It is a protocol to forward the file on the network. That exists since the Internet initial, it is one of the protocols often still use by the Internet. On the protocol, the file transfer between arbitrary hosts can be done. But, it is used forwarding between the client and the server connecting the usually. As a usage: ● Uploading of HTML file and picture file, etc. to web server. ● Download of file from FTP file server to client. It is possible to download it also with the browser software. The FTP client software or the CUI command are need for uploading.
  4. 4. Packet The collected small thing of the data to which control information, including the address of a transmission place etc., was added in online communications. The communication method which divides, transmits and receives data to a packet is called packet communication. It is lost that an intermediate circuit is occupied by communication between some 2 points, and a communication line can be efficiently used by dividing, transmitting and receiving data to many packets. Moreover, since channel selection can be performed flexibly, even if an obstacle comes out in part, there is also an advantage that other circuits can be substituted.
  5. 5. Router In a computer network , it is a communication facility which carries out interconnection of between two or more different network . Since tcp/ip came to be used for a communications protocol , it spread . Outline A router is a communication facility whic carries out interconnection of between networks,and if it says by the OSI basic reference model whic consists of seven layers which classified the function of the computer network,it will bear connection from the 1st layer "physical layer"to the 3rd layer "network layer."Although a basic function is equipment whic enables it to exchange the IP packet between each network,in addition to foundations,various addition functions are realized in practice.
  6. 6. Reference http://ja.wikipedia.org http://e-words.jp/

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