Networks. Learning Objectives Understand what a network is and the advantages and disadvantages Know...
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Transcript of Networks. Learning Objectives Understand what a network is and the advantages and disadvantages Know...
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Networks
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Learning Objectives
• Understand what a network is and the advantages and disadvantages
• Know the difference between wired and wireless networks
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Networks• What is a Network?
• What hardware do you need to make one?
• What are the advantages and disadvantages of a network?
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NetworksA network is two or more computers connected together so they can communicate which each other.
There are 2 main types of network…
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Networks: LANsLAN stands for:
LOCAL AREA NETWORK
LANs are networks that are found where computers within a building need to communicate.
They are Small and Local!
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Networks: WANsWAN stands for:
WIDE AREA NETWORK
WANs are networks that are found where computers in different areas or countries need to communicate.
They are long range and not local!
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Networks: WANsWhat extra hardware do you need for a WAN network? •Modems : To connect up to
a telephone system (instead of cable).
How a modem works…
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By the end of this section, you will
know and understand the hardware and
software involved in making a
network
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• Main computer on the network.
• More powerful than other computers on the network.
• Contains a large amount of RAM and Hard Disk space.
• Holds the networks OS e.g. Windows XP
• Holds the application software e.g. Microsoft Office Suite.
• Stores the user files created on the system.
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• Also known as NIC.
• Each computer MUST have one of these.
• It communicates with the file server and other computers on the network.
an RJ-45 NIC
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• These plug into the back of each computer and link them together.
• They go straight into the Network Interface Card inside the computer.This is an RJ-45 cable, otherwise known as an
Ethernet Cable.
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• A switch is a single connection point for a group of computers.
• The switch is then connected to the file server and organises the communication.
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Wireless Router
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Phone Line
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Ethernet
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Wireless Network
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By the end of this section, you will
know and understand the
additional hardware and
software involved in making a WAN!
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• Stands for Modulator – Demodulator.
• First created to take digital signals from a computer and convert them to analogue so that they can be transmitted down a telephone line.
• Speed at which a modem operates will affect the download time of web pages and files.
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• An ISP sells Internet access to companies and individuals.
• It provides web servers which connect to the Internet.
• An ISP will provide it’s customers with a wide range of services…
• Bandwidth options.
• Email service.
• Web Hosting.
• Online and Telephone assistance.
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• Browser software allows users to view and use the web pages on the Internet.
• Features include:• An Address Bar.
• A Navigation Bar.
• A Bookmark/Favourites Option.
• A Search Engine.
• A History Button.
• Browser Setting and Internet Options e.g. Filtering.
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Networks:Some advantages of a network are:• Resources (Hardware and Software) can be shared.
• Allows more effective communication between users e.g. via e-mail.
• Networks are cheaper than “stand-alone PCs.”
• Information held on the network can be accessed by all users with authorised access.
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Networks:Some disadvantages of a network are:• The set-up and maintenance costs can be expensive.
• A fault with the network server can cause difficulties with the organisation.
• Networks need security measures to restrict access to users.
• WANs are vulnerable to hackers and viruses.