Transcript Introduction to Networks Metropolitan area network

Sistemas de Información
Agosto-Diciembre 2007
Sesión # 3
Proyecto Integrador
Objetivo:
Diseñar y desarrollar una aplicación
usando el modelo de bases de datos
relacional (2 o 3 personas)
Entregables:
1. Propuesta de proyecto (8/29)
2. Modelo de datos (9/19, 10 puntos)
3. Prototipo v1.0 (10/17, 10 puntos)
4. Prototipo v2.0 (11/14, 10 puntos)
Proyecto Integrador
Propuesta:
Objetivo del proyecto
Entidades principales
Funciones principales
Calendario de actividades
(entregables)
Grupo de consultores (roles)
Introduction to Networks
Network:
A collection of computers
connected together via
communication devices and
transmission media.
Network node:
A computer or device within
a network
Network Examples
Introduction to Networks
Network types:
Local area network (LAN)
Metropolitan area network (MAN)
Wide area network (WAN)
Introduction to Networks
Local area network (LAN):
A network that connects computers and
devices in a limited geographical area, such
as a room, a building, or campus.
Examples:
Your computer and printer at home
Computers and devices at work
Wireless network on campus (WLAN)
Introduction to Networks
Metropolitan area network (MAN):
A network that connects LANs in a
metropolitan area, such as county,
town, or city.
It handles the bulk of communications
across a metropolitan area.
Examples:
State of Pennsylvania has a MAN
connecting diverse state agencies
within the state capital.
Introduction to Networks
Wide area network (WAN):
A network that covers a large
geographic area, such as a city, a
state, a country or the world.
Examples:
Internet is the world’s largest
WAN.
Introduction to Networks
Internet:
A wide area network (WAN) that
covers a world wide geographic area.
World Wide Web (WWW):
A library of information available to
anyone connected to the Internet.
Web page
Web site
Introduction to Networks
Intranet:
An internal network making information
accessible only to members of a group
of users.
Intranet applications:
Directories
Calendars
Project Management
Organizational information management
Etc…
Introduction to Networks
Intranet examples:
Portal DAE
Portal VAF
BlackBoard courses
WebCT courses
Other?
Introduction to Networks
Network architecture:
The way in which computers
and devices communicate to
each other within a network.
Network architecture types:
Peer-to-Peer
Client/Server
Introduction to Networks
Client/Server Architecture:
A network in which a computer
known as “server” is in charge of
providing information and services
to other computers known as
“clients”.
PDLib: Client/Server Architecture
Introduction to Networks
Client/Server Architecture
Server:
Controls access to the network services.
Provides storage space for programs,
data, and web sites.
Also known as “host computer”.
Client:
Computer, cell phone, or PDA that
requests services to the server, following
predefined rules and procedures.
Network Standards
Network standard:
A set of guidelines that specify the way
in which computers and devices
communicate with each other within a
network, in terms of speed, media,
physical cables, and technology used.
Main network standards:
ANSI
IEEE
Network Protocols
Network protocol:
A set of guidelines that specify the way in
which two devices communicate with each
other within a network, in terms of data
format, coding schemes, and error handling.
Main network protocols:
Ethernet
Token ring
TCP/IP
802.11 (WiFi)
Bluetooth
IrDA
Ejercicio en Clase
En base a las necesidades de información en
una biblioteca, realiza:
Un Diagrama E – R
Un Diagrama E – R Extendido
Una lista del tipo de búsquedas y consultas que
podrían realizarse en la base de datos ya
implementada, desde el punto de vista de:
El director de la biblioteca
El encargado de realizar reparaciones
Las personas que solicitan préstamo de objetos