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Introduction The company Parstech is undergoing a change in infrastructure. There are several changes which were suggested by the top management. The cost of branch communications should be reduced by using current technology. Besides that, services to be online to make it easier to fix errors. The online services need to be extended up to international level. There should be security for the now-online services. Online services (troubleshooting and maintenance) should be able to continue its operation on 24/7 basis without interruption. Finally, existing technology should be used as much as possible to save cost. Based on the existing technology, it is known that the corporate MAN connection makes use of lease lines. In the office buildings, LAN connection with hybrid bus/star topology is used with Ethernet LAN transmission medium. In the new Network Design, a few additions are present.

Figure 1 - Parstech Wide Area Network This network design shows the Wide Area Network and the relationships between the branch offices and the main headquarters. The main headquarters is where the application servers of the company is present. This is to enhance security by placing it in one place. The branch servers are connected to the main headquarters by means of leased lines using the transmission medium fiber optics. The bandwidth and data rate of fiber optics is required to maintain the connection under high network usage.

Figure 2 – Sample Internal Architecture of LAN in one of the offices.

The diagram above shows the architecture of an office building in one of the branches. The whole network is set behind a firewall as a measure of protection. The switches give connection to terminals and also resources such as printers. Some protocols are needed for the printers to work correctly when remote, namely the Line Printer Daemon Protocol or LPR. This

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