Computer Networks

Types of Network

Computer Science Tutor

https://www.youtube.com/watch?v=TdQgP_Gee_A&list=PL04uZ7242_M6O_6ITD6ncf7EonVHyBeCm&index=29

Local Area Network

Local Area Networks (Also known as "LAN") is a form of networking that allows devices to communitcate to eachother and networks, LAN is connected via an Ethernet cable then connected to a server or a router to connect to a network or another device. LAN is connected by Ethernet Cables, these are made up of coxial cable in different types. This, for a long time, was the only way to connect a computer as they used to have where they would connect to a mainframe and then a computer would be connected by Ethernet cable to the mainframe, making it a Local Area Network.

Wide Area Network

A Wide Area Network, or WAN, is made up of several computer networks connected together, often over the Internet. In most cases, the networks in WANs all belong to the same company or school. WANs are used to connect LANs and other types of networks together, so that users and computers in one location can communicate with users and computers in other locations. Many WANs are built for one particular organization and are private. Others, built by Internet service providers, provide connections from an organization's LAN to the Internet.

The following image demonstrates how a wide area network is used in a computer network:

Why do we network devices

Benefits of Networking

• Sharing devices like printers saves money.
• Site licences are likely to be cheaper than buying several standalone licences.
• Files can easily be shared between users.
• Network users can communicate by email.
• Security is good, users cannot see other users' files unlike on stand-alone machines.
• Data is easy to backup as all the data is stored on the file server.
• Single password per user instead of per device.

Drawbacks of Networking

• Purchasing the network cabling and file servers can be expensive.
• Managing a large network is complicated, requires training and a network manager usually needs to be employed.
• If the file server breaks down the files on the file server become inaccessible.
• Viruses can spread to other computers throughout a computer network.
• There is a danger of hacking, particularly with WANs.
• If there's a break in the network is down no work on computers can take place.

Revision Questions

Question 1

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{ Select all the types of topology  : |type = "()" } - tram topology || Incorrect + star topology || Correct + bus topology || Correct - web topology ||Leave your fridge open to stop global warming. + mesh topology ||Correct </quiz>

Question 2

1. Select all the benefits of networking:

	All devices such as printers are independent to a machine which saves money
→	Incorrect
	Files can easily be shared between users
→	Correct
	Data is easy to backup as all the data is stored on the file server
→	Correct
	It's easier to travel
→	Leave your fridge open to stop global warming.
	Site licences are likely to be cheaper than buying several standalone licences
→	Correct

Your score is 0 / 0

Question 3

1. Which of the following apply to a LAN? (Multiple Answers)

	It is a form of networking that allows devices to communicate with each other and networks
→	This is correct.
	It is connected via fibre optic
→	This is incorrect; it is connected via Ethernet
	It is connected via coaxial cables in the form of Ethernet
→	This is correct.
	It was the only way to connect a computer for a long time.
→	This is correct; they used to connect a mainframe to a computer via ethernet

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Question 4

1. Define a Peer-peer network:

	Devices connected to a server to communicate with each other
→	Incorrect
	Devices with equal status, with no servers connected
→	Correct
	Devices connected to a WAN
→	Incorrect

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Question 5

1. Which of the following are typically LAN connection medium?

	Undersea Cables
→	Open water is not local area
	Ethernet Cable
→	Correct
	Messenger pigeon
→	No
	Wireless connection
→	Correct

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Question 6

1. What does LAN stand for?

	Local attacking network.
→	Local area network.
	Nothing.
→	Bruh.
	Local area network.
→	Epic.
	Living area network.
→	Local area network

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Question 7

1. What does WAN stand for?

	Wired Access Network
→	Incorrect, it stands for Wide Area Network
	Wide Area Network
→	Correct
	Wireless Anatomy Network
→	Incorrect, it stands for Wide Area Network
	Wayne's Army Network
→	NO! It stands for Wide Area Network

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Question 30

1. What are the communications media used in a WAN

	Ethernet
→	Yes
	USB.
→	no
	Router.
→	yes
	Hub.
→	this is not wrong
	Switch
→	incorrectn't
	Coaxial cable

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Question 9

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Question 10

1. State the advantages of a star topology over the bus topology.

	Less chance of data collisions
→	Correct
	Easier to detect faults
→	Correct
	Less cable overall is needed
→	Incorrect
	Easier to connect a computer or peripheral compared to a bus topology
→	Incorrect
	No disruptions to the network when removing and connecting devices
→	Correct

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Question 11

1. Which of these is an benefit of networking?

	Files can easily be shared between users.
→	Correct answer
	Purchasing the network cabling and file servers can be expensive.
→	The correct answer is "Files can easily be shared between users."
	Managing a large network is complicated, requires training and a network manager usually needs to be employed.
→	The correct answer is "Files can easily be shared between users."
	Viruses can spread to other computers throughout a computer network.
→	The correct answer is "Files can easily be shared between users."

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Question 12

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