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Descubra todo lo que Scribd tiene para ofrecer, incluyendo libros y audiolibros de importantes editoriales. Why Choose a WAN? Operates beyond the geographic scope of a LAN Used to interconnect the enterprise LAN to remote LANs in branch sites and telecommuter sites Owned by a service provider Organization must pay a fee to use the providers services to connect sites.

Are WANs Necessary? Businesses require communication among geographically separated sites. Examples include: Regional or branch offices must be able to communicate and share data. Organizations must share information with other customer organizations.

Mobile workers must access information that resides on corporate networks. Home computer users must send and receive data across increasingly larger distances. Examples include: Consumers communicate over the Internet with banks, stores, and a variety of providers of goods and services. Students do research by accessing library indexes and publications located in other parts of the country and in other parts of the world.

Evolving Networks Companies expect their networks to perform optimally and to be able to deliver an ever increasing array of services and applications to support productivity and profitability. SPAN Engineering example used in the curriculum.

Contracted to design and implement a full-sized waste conversion facility. Won other projects in neighboring municipalities and in other parts of the country. Hired more staff and leased more office space with several hundred employees, organized itself into functional departments.

Network now consists of several subnetworks, each devoted to a different department. Multiple LANs are joined to create a company-wide network or campus, which spans several floors of the building. To manage those projects, the company has opened small branch offices closer to the project sites. SPAN Engineering now has a data center, which houses the various databases and servers of the company. They must now implement a WAN.

For its branch offices that are in nearby cities, the company decides to use private dedicated lines through their local service provider. For those offices that are located in other countries, the Internet is an attractive WAN connection option. Although connecting offices through the Internet is economical, it introduces security and privacy issues that the IT team must address. Distributed Networks SPAN Engineering has now been in business for 20 years and has grown to thousands of employees distributed in offices worldwide.

Cost of the network and its related services is a big expense. Looking to provide the best network services at the lowest cost. Encouraging teleworking and virtual teams, web-based applications are being used to increase productivity and reduce costs. Site-to-site and remote access Virtual Private Networks VPNs enable the company to use the Internet to connect easily and securely with employees and facilities around the world.

Distributed Networks cont. Network requirements can change dramatically as the company grows. Distributing employees saves costs in many ways, but it puts increased demands on the network.

Network must be able to adapt and grow as the company changes. Network designers and administrators meet these challenges by carefully choosing network technologies, protocols, and service providers, and by optimizing their networks. WANs in the OSI Model WAN access standards typically describe both physical layer delivery methods and data link layer requirements, including physical addressing, flow control, and encapsulation.

Packet Switching Splits traffic data into packets that are routed over a shared network. Packet-switching allow many pairs of nodes to communicate over the same channel. PVCs carry both voice and data traffic. Built on a cell-based architecture, rather than on a frame-based architecture. ATM cells are always a fixed length of 53 bytes.

Always-on connection technology that uses existing twisted-pair telephone lines to transport highbandwidth data, and provides IP services to subscribers. Network access is available from some cable television networks. Cable modems provide an alwayson connection and a simple installation.

Satellite Internet. These technologies support wireless Internet access. What is the geographic scope? What are the traffic requirements? Comience la prueba gratis Cancele en cualquier momento. Fecha en que fue cargado Oct 12, Compartir este documento Compartir o incrustar documentos Opciones para compartir Compartir en Facebook, abre una nueva ventana Facebook. Denunciar este documento. Descargar ahora. Carrusel Anterior Carrusel Siguiente.

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