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NETWORKS Year 12 Unit 1. Lesson objectives To understand and define What is a network? LANs and WANs...
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Transcript of NETWORKS Year 12 Unit 1. Lesson objectives To understand and define What is a network? LANs and WANs...
NETWORKSYear 12 Unit 1
Lesson objectives
To understand and define•What is a network?•LANs and WANs •The Internet, Intranet and Extranet •Network Hardware and Software•Networks and standalone computers
What is a network?
•A group of ICT devices which are able to communicate with each other. They may be able to communicate via a wired or wireless connection.
What is a LAN?
•A LAN or local area network is generally confined to a single building or site
•The organisation running a LAN owns all the equipment that links the terminals (Computers)
What is a WAN?
•A WAN or wide area network spans over a wide geographical area, including multiple buildings and sites
•Third party telecommunications equipment is used, i.e. Telephone, radio and satellite communications are needed which are supplied by third party companies such as BT.
What is an Intranet?
•An intranet is a private network that uses the same technology as the internet used for sending messages around a network.
•Its main use is to share resources and organisational information
What is an Extranet?
•An Extranet allows customers, suppliers as well as employees of an organisation to access information.
•They are protected by usernames and passwords.
•This is usually accessed through the internet.
What is the Internet?
•The internet is a network of networks enabling people to exchange information and share data.
Internet Advantages and disadvantagesAdvantages Disadvantages
Methods of cheap communication all around the world
The ability to access inappropriate material
Access to video such as tv programmes Cyber bullying
Ability to send/receive files Advertising pressures – constant bombarding of advertising material
Ability to research information Health problems – such as RSI
Opportunity to share resources Privacy is eroded and lost as information about surfing habits are logged
Wide range of software available Gambling addictions
Incorrect and inaccurate information
•Electronic email sent from one communication device to another.
Email services
Service Use
Search Searching for specific emails
Reply Reply to a message keeping log and doesn’t require you to add email address
Forward Passing on emails
Address Book A list of contacts of people you are likely send an email too
Groups Lists of people and email addressed for group emails
File attachments A file attached to an email
Voice Mailboxes Allows voice messages to be sent
Email advantages and disadvantagesAdvantages Disadvantages
Virtually instantaneous Not everyone has email
No need for the familiarity of a letter Junk email is a problem
Minus the cost of software and hardware, email is free
Worries about security
Emails can be accessed from a wide range of devices
Relies on checking emails
More environmentally friendly Not always secure, emails can be intercepted and attachments may contain viruses
Wifi
Advantages Disadvantages
Allows inexpensive LANs to be set up without cables
Power consumption is high – i.e. laptop battery drains quicker
Allows the freedom of working anywhere within signal
MAY be health problems using Wifi
Ideal for networks in old listed buildings where cables would not be allowed to be install
May be security issues even when using encryption
Can be used worldwide Home networks have limited range
Possible interference if wireless signals overlap