Difference between revisions of "Computer Networks"

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=Types of Network=
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===Computer Science Tutor===
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<youtube>TdQgP_Gee_A</youtube>
 +
 +
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.
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 +
The following image demonstrates how a wide area network is used in a computer network:
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[[File:17d1c375cab9c86e64c0b5987e1d6fc5109739c3.gif|x500px]]
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=Why do we network devices=
 
==Benefits of Networking==
 
==Benefits of Networking==
−
- Sharing devices like printers saves money.
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* Sharing devices like printers saves money.
−
- Site licences are likely to be cheaper than buying several standalone licences.
+
* Site licences are likely to be cheaper than buying several standalone licences.
−
- Files can easily be shared between users.
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* Files can easily be shared between users.
−
- Network users can communicate by email.
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* Network users can communicate by email.
−
- Security is good, users cannot see other users' files unlike on stand-alone machines.
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* 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.
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* 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==
 
==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.
  
−
=Types of Network=
+
=Revision Questions=
 +
<quiz display=simple>
 +
{ What does LAN stand for?
 +
| type="[]" }
 +
- Logical active network.
 +
||Local area network was the correct answer.
 +
- Nothing
 +
||Bruh.
 +
+ Local area network.
 +
||Noice one.
 +
- Live area network.
 +
||Local area network was the correct answer.
 +
 
 +
{ Which of the following apply to a LAN? (Multiple Answers)
 +
|type="[]" }
 +
+ 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
 +
- It is a geographically remote network
 +
||This is incorrect; it is geographically confined.
 +
 
 +
{Which of these is not a drawback of using LAN?
 +
| type="[]" }
 +
 +
+ Saves money by sharing devices, like printers
 +
||This is a benefit
 +
- Managing a LAN is complicated
 +
+ Easy to back up data
 +
||This is a benefit
 +
- Viruses can spread to other computers throughout the network
 +
 
 +
{ What does WAN stand for?
 +
| type="()" }
 +
 
 +
- 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
  
−
==Local Area Network==
+
{What are the communications media used in a WAN
−
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.
+
| type="[]" }
 +
+ Ethernet
 +
|| Ethernet cables connect devices in a WAN together.
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- USB.
 +
|| USB is not used in a WAN.
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+ Router.
 +
|| Routers allow networks to connect to a LAN.
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+ Hub.
 +
|| Hubs send data to all connected devices.
 +
+ Switch
 +
|| Switches send data to the device that requested it, or to the device it is directed to.
 +
- Coaxial cable
 +
|| Coaxial cable is not used within a WAN.
  
−
==Wide Area Network==
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{ Select all the benefits of networking:
−
A wide area network (WAN) is a collection of local area networks (LAN) over a geographical area. An example of a WAN is the internet.
+
|type = "[]" }
 +
- 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
 +
+ 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."
 +
</quiz>

Latest revision as of 11:39, 18 November 2019

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:

17d1c375cab9c86e64c0b5987e1d6fc5109739c3.gif

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

1. What does LAN stand for?

Logical active network.
→Local area network was the correct answer.
Nothing
→Bruh.
Local area network.
→Noice one.
Live area network.
→Local area network was the correct answer.

2. 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
It is a geographically remote network
→This is incorrect; it is geographically confined.

3. Which of these is not a drawback of using LAN?

Saves money by sharing devices, like printers
→This is a benefit
Managing a LAN is complicated
Easy to back up data
→This is a benefit
Viruses can spread to other computers throughout the network

4. 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

5. What are the communications media used in a WAN

Ethernet
→ Ethernet cables connect devices in a WAN together.
USB.
→ USB is not used in a WAN.
Router.
→ Routers allow networks to connect to a LAN.
Hub.
→ Hubs send data to all connected devices.
Switch
→ Switches send data to the device that requested it, or to the device it is directed to.
Coaxial cable
→ Coaxial cable is not used within a WAN.

6. 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
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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