Transcript Designing a Network

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
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Word processor
spreadsheet
End-user database
Presentation graphics
E-mail
Personal information manager
Virus-scanning software
Aplicaciones por Departamentos
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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
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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