module 2.1 introducing networkshighveldpark.co.za/.../2020/04/2_1-intro-to-networks.pdf2020/04/02...
TRANSCRIPT
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Module 2.1
Introducing networks
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What is a network?
Advantages of networks
• Fast, efficient communication
• Sharing of hardware
• Sharing of files
Disadvantages of having a network
Test and improve
Written module activity
Contents
• Centralisation of data
• Flexible access
• Leisure
• Increased control and security
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We have a network when two or more computers or mobile devices are
connected to each other
What is a network?
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Local Area Networks(LAN)
Global Networkinternet
(GAN)
What is a network?
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LAN vs. GAN
• Local Area Network
• Covers a relatively small are such as a school, university campus, office building etc.
• Cannot be accessed outside of the area.
• Most common connection.
• Global (Area) Network
• Covers a large geographical area such as provinces, countries and continents. Hence ‘GLOBAL’.
• Eliminates distance constraints.
• The Internet is a GAN.
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• A network is a collection of computers and other devices such as smartphones or tablets
• that are connected either via cable or wirelessly (both know as the communication media)
• to allow (purpose) users to:
• Communicate
• Share software
• Share hardware
• Share data and information
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Fast, efficient communication
• School environment: email / SMS parents
• Instant messages: WhatsApp / BBM / Messenger / WeChat etc
• Social Networks: Facebook / Instagram
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Advantages of networks
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Advantages of networks
Sharing of hardware
• Equipment can be shared by users on a network – it is cheaper than buying a device for each computer.
• You can even print from your smartphone to any printer in the world!
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• Files on a server can be accessed by learners,and teachers can retrieve learners’ files.
• Files can be saved in the ‘cloud’ –on a computer connected to the internet 9
Advantages of networks
Sharing of files
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• Networking allows us to access files or folders on a central computer (as if these were actually on our own computer)
• Databases ensure that multiple users cannot make conflicting changes to data (while also ensuring that changes made by users are immediately available to other users)
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Advantages of networks
Centralisation of data
No two people can book the
same seat in a theatre!
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• We are not limited to the physical location of our computers
• Using internet removes location-specific limit of a network
• Use cloud storage to save & ‘sync’ files
• Internet banking can be done from home
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Advantages of networks
Flexible access
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Advantages of networks
• Radio, video and television can be ‘streamed live’ over the internet
• E-books, online newspapers and magazines can be downloaded
• Online gaming – play against others around the world (MMORPG)
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Leisure
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• Easier to control access to data (not anyone can access data…almost like in the class. Only you can access your data using your username and password)
• Data is stored centrally (one place) – easier to make backups
• Maintain integrity of data – update in one location
• Easier to send updates (e.g. anti-virus software) to all computers from one central computer
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Advantages of networks
Increased control and security
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Disadvantages of having a network
• Learning curve – how to protect your privacy online and how to communicate safely.
• Can be expensive to set up and maintain
• Confidential / sensitive information may be stolen
• Harmful software can spread quickly
• If network develops a problem, users might not be able to communicate or access data (how many times
have you been at Jet where the system is ‘offline’?)
• Central fault in network can cause loss of data
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Test and improve
Network
Server
Internet
Advantages
Disadvantages
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Summary – concepts, terms and tips
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Written module activitypage 93
number 1-9
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