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Networks: Guadalupe Pinto and Agustina Weber - Coggle Diagram
Networks: Guadalupe Pinto and Agustina Weber
Disadvantages
Dependance
reliance on network resources
might get stuck without access to it
Risk of
Viruses
Networks make it easy to share viruses and other malware
Hacking
hackers gain access
Expensive hardware
Specialist staff often required
to put expensive hardware at school or office.
Advantages
share files
it is easy to share over a network.
Every computer does not need to fill the hard drive with files.
roaming
information is stored on a network
You can use computers anywhere in the world to access their information
communication
easy to comunicate
share internet connection and devices
Easy to share resources such as printers
possible to stream software using web applications
Types of networks
LAN
Local Area Network
does not need internet
within the same building
WAN
Wide Area Network
LANs connected
connects different organizations from different places
requires broadband cables
VPN
Virtual Private Network
hosted on another network to provide connectivity
often used when working on secure information
WPAN
Wireless Personal Area Network
allows an individual
to connect devices to a desktop machine
to form a Bluetooth connection with devices in a car
PAN
Personal Area Network
wired personal network
WLAN
Wireless Local Area Network
use of
infrared signals
radio
Topologies
Bus Network
Disadvantages
main cable fails, whole network fails
more workstations connected slower performance o network because of data collisions.
not secure that every workstation 'sees' the data and information
Tips
Workstations, servers and printers are connected to one cable
each end of the cable has a terminator that is fitted to stop signals reflecting back down the bus.
Advantages
Cheap to install
Easy to install
ring network
Tips
One device is connected to 2
Data packet
One direction
Advantages
Quickly data transfer
Disadvantages
If one main cable fails
Whole network fails
Star network
Tips
Devices have own cable connected to switch or hub
Advantages
reliable
If one cable fails others continue
High performing as no data collisions
Disadvantages
Expensive to install (cable)
Extra hardware is recuired
If hub or switch fails, devices connected have not network connection
Hardware Devices
Router
Can form a LAN
Connects different networks together
Homes and businesses use it to connect to the internet
Can incorporate a modem within the hardware
Can incorporate hubs, switches and wireless access within the same hardware
Modem
Enables computers to connect to the internet over a telephone line
Converts digital signals from a computer to analogue signals that then are sent down the telephone line
On its other end it converts the analogue signal back to a digital signal which another computer can understand
Hub
Broadcasts data to all devices on a network
can use lot of bandwidth
when unnecessary data is sent
maybe not all computers need it
links up game consoles for a local multiplayer using wired LAN
Bridge
connects two separate LAN networks
A computer can act as a bridge through the operating system
looks for the receiving device before sending the message
It will check if the message was already received
helps to save unneccesary data transfers
Switch
Stores MAC addresses of devices o a network
more efficient when demand is high
filters data packets to see which devices have asked for them
WAP
Wireless Access Points
Connect to network wirelessly
Are usually built into the broadband router
Communication
MAC address
it is embedded in the hardware
when
the product is made in factory
the user cannot change it
it is a unique code built into a NIC on a computer
two computers cannot have the same MAC address
Servers
stores data to be used by other computers on a network
Print servers
Make it easy for various devices to connect to one same printer
that
Removes the need of the devices to install the printer driver software
Connect to the printer using server
Mail servers
Store email messages
Your browser makes request to mail servers to retrieve the messages.
Web Servers
host websites
Generally handle requests for static information
They are used to manage the website on the server
often include FTP software
File server
Users of network can save and load data
HTTP
HTTPs
with "s"
secure
HTTP
no "s"
not secure
HyperText Transfer Protocol
transfers web pages from web servers to the client
All web page addresses start with http
is a secure web address which has been encrypted
is used for sites holding bank details and secure information
VOIP
Voice Over Internet Protocol
Set of protocols that enables people to communicate through voice conversations over the internet
IP
Data packet
Unique IP adress
Intranet
private internet
used for
Web pages
Emails
Sharing files and information
You connect to an internet by a login id and password
Provide information
Extranet
public internet
example: internet
access and share data from other computers
Used for
Share information
You connect to internet by
computer device
router
ISP (internet service provider)