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3.1.1 Network Resources - Describe the purpose of the network recources…
3.1.1 Network Resources - Describe the purpose of the network recources
Media Converter
Definition
A simple networking device that makes it possible to connect two dissimilar media types
Works by changing physical signals where different types of network links meet.
Example: Fibre-optic meeting twisted pair cables
Server
Definition
A computer on a network that manages resources
File Server
Definition
Main computer on the network with a large amount of RAM and hard disk space. Dedicated to storing user files.
holds:
Network Operating System Software,
Application Software,
User Files,
System Software
and Utility Software
Purpose
Monitors all computers
Connects all computers
Allows users to log on
Stores User Files and Folders
Stores Application Software
Stores Network Software
If the file server breaks
NONE
of the computers on the network will work.
Printer Server
Definition
A computer that is used to manage one or more printers
The printer server allows the client stations to use a printer controlled by it.
Other Types
Web Server
- A web server uses HTTP to serve requested web pages to client machines. It will serve HTML pages, JavaScript, CSS and image files. Apache and Microsoft IIS are common web servers. A web server that provides web pages for users on a LAN is called a intranet.
Mail Server
- This sends, receives and stores emails using protocols such as IMAP, POP and SMTP. Services such as Gmail, Hotmail and Yahoo Mail provide a wed page interface for the user and have a mail server on the backend.
Database server
- This allows client computers or software to access a central database at the same time. This s a service provided by the Database Management System (DBMS). Microsoft SQL server and MySQL are database servers
Network Card
Definition
Required to communicate with the file server and all other computers on the network. It provides a 'port' to allow the data from the network to be transmitted to the computer via fixed cable.
Normally installed on a computer when bought.
Connects to wireless router which provides mobile access to a network.
Repeater
Definition
Used to regenerate, replicate or amplify a signal that is travelling along a long network cable to prevent it being distorted by transmission loss.
reconstructs a signal to near its original quality, it doesn't just amplify it as the distortion and noise will also be amplified.
Hubs can operate as repeaters by replaying messages to all connected computers.
Used to link two segments of cable.
Over long distances signal strength weakens, the repeater regenerates signals distorted by loss over distance.
Signal strength can be reconstructed to its original quality with no data loss.
Typical maximum cable lengths:
Think Ethernet - 500m
Thin Ethernet - 185m
Copper cables - 100m
Wireless Access Point
Definition
Hardware devices that allows a wi-fi enabled device to connect to the internet
Normally makes a connection to a router to access a network
Used commonly by Wi-Fi hotspots to support their Wi-Fi coverage.
Switched Hub
Definition
Switches are an advanced form of network hub. When a message arrives the switch reads the IP address of the incoming data packet and transmits it to the destination device.
Connects file server to computers in a LAN.
switch will send data to specific computer by using an IP address to find correct destination
by switching the connection between ports, devices can make use of full bandwidth without collisions
Collisions can occur on a network if two computers try to communicate at the same time.
Network Resources
Definition
The components of a network that allow communication between Devices. Functions as the brain of the network.