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Designing a Network COMP 315 Choosing Desktop Computers • Apoyar dos o más plataformas de computadoras es problemático. Considere lo siguiente: – Necesidad de tener expertise en varias plataformas – Necesidad de tener en “stock” piezas de equipos diferentes – Necesidad de tener varias licencias e inventario de software – Incompatibilidad – Limitación en la programación a desarrollar Aspectos a considerar • Confiabilidad y servicio • Precio y ejecutoria Requerimientos de un “Network Workstation” • Hardware – NIC (network interface card) – Cables – conectores • Network workstation software Accesando las necesidades del network • ¿Cuánto espacio de almacenamiento se requiere? • ¿Cuánta capacidad de la línea de transmisión (bandwidth) se requiere? • ¿Qué servicios ó aplicaciones se requieren? • ¿Cuál es el presupuesto del proyecto? Aplicaciones • • • • • • • Word processor spreadsheet End-user database Presentation graphics E-mail Personal information manager Virus-scanning software Aplicaciones por Departamentos • • • • • • • • • • • Accounting Distribution and inventory control Manufacturing /MRP Information technology Electronic commerce Human resources Payroll and stock administration Publishing Marketing support Legal Other line-of-business applications specific to the company’s industry Usuarios • Bandwidth requirements • Storage requirements • Service requirements Network services • • • • • • • • • • • • • • File and print services Backup and restore services Internet web browsing FTP and Telnet Internet or external e-mail Internet security services Dial-out from LAN through a modem pool Dial-out to LAN through a modem pool Fax into LAN Dynamic host configuration protocol (DHCP) services Centralized virus-protection services WAN services to other locations streaming internet radio and other media Voice over IP (VoIP) Security and Safety • Need to keep information secure – both inside and outside a company- and to keep the company’s data safe from loss Growth and Capacity Planning • A network designed for a rapidly growing company looks different from one for a slowly growing company, even if both companies start out at the same size. Meeting Network Needs • Choosing Network Type – Ethernet is by far the most common type of network installed today • For wiring to the desktop, you should choose 100Base-T • For your network backbone, you can usually use a higher-bandwidth connection, such as 1000Base-T Choosing Network Structure • Ethernet’s CDMA/CD collision handling means that an Ethernet network will handle only about one-third of its rated speed. • Except in the smallest networks, plan on a network backbone to which the hubs connect. • The physical building might dictate how you structure your network. • Consider running the backbone speed at 10 times the hub/desktop network speed. Choosing servers • NOS (network operating system) – PC-centric networks • Novell Netware 5 or Windows 2000 Server