Networks - protocols and adv / disadv

​Do Now:

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1. Go to class notebook

2. Complete do now:

   Networks

​Do Now: ANSWERS

​Name 3 input devices

Mouse, keyboard, microphone​

Name 3 output devices

speaker, printer, monitor​

Name a device that is both input and output: Tablet, mobile phone, interactive whiteboard

Hardware is the physical parts of a computer system

An example of hardware is: mouse, keyboard, monitor

Software is the programs, applications and data in a computer system. Any part of a computer system that aren't physical.

An example of software is: Microsoft Teams, Minecraft, Instagram

​Big Question

​What is a computer network and how is data is transmitted between computers across networks?

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What are the advantages and disadvantages of being on a network?

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Key Words: Protocol, network, transmission

​Protocol (noun)

​pro-toe-call

​A system of rules that explain the correct conduct and procedures to be followed in certain situations

​"They followed the correct protocol when the alarm was raised"

​How many devices are connected to the internet?

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Person 1: I think that ....... devices are connected.

Person 2: I agree / disagree / would like to build on that ...​

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​Turn & Talk

​How many devices are connected to the internet?

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Answer:

There are now over 8.2 billion people on the planet.
By 2025, the number of internet‑connected devices worldwide reached well over 30 billion, including smartphones, computers, smart TVs, and smart home devices.

Experts now predict that the number of connected devices will rise to around 40 billion by 2030, as more everyday objects become connected to the internet

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​Turn & Talk

​What is a computer network?

​Computer network – where two or more computers are connected together to allow them to communicate.

​What is a computer network?

​Computer network – where two or more computers are connected together to allow them to communicate.

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What is a network of networks called?​

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​What is a computer network?

​Computer network – where two or more computers are connected together to allow them to communicate.

​The internet is an example of a network. It is a network of networks.

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Interconnected Network

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​What common daily activities do you think use computer networks throughout the day? 

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Person 1: I think that .......

Person 2: I agree / disagree / would like to build on that ...​

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​Turn & Talk

​How many common daily activities do you think use computer networks?

​How many common daily activities do you think use computer networks?

​Morning: music playing via a Bluetooth speaker, asking Alexa for the weather forecast, controlling your central heating via an app on your phone

​How many common daily activities do you think use computer networks?

​Morning: music playing via a Bluetooth speaker, asking Alexa for the weather forecast, controlling your central heating via an app on your phone

​Daytime: logging on to a PC for a Computing lesson, accessing files stored on the school network, printing to the library printer, researching a topic on the internet

​How many common daily activities do you think use computer networks?

​Morning: music playing via a Bluetooth speaker, asking Alexa for the weather forecast, controlling your central heating via an app on your phone

​Daytime: logging on to a PC for a Computing lesson, accessing files stored on the school network, printing to the library printer, researching a topic on the internet

​Evening: Using social media,

using streaming services,

playing games online​

​A message to Australia

​Imagine that you need to send a message from the UK to Australia but no computer networks exist

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What methods would you use?

What information would you need?

Would anyone be involved in relaying the message?​

​A message to Australia

​Imagine that you need to send a message from the UK to Australia and computer networks exist

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What methods would you use?

What information would you need?

Would anyone be involved in relaying the message?​

​Message transmission: email

​Just as a letter does not go directly from the sender to the recipient, the email does not travel from a sender’s machine through a cable or “into the cloud” directly to the recipient’s machine.

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The message is passed on to many mail servers along the way, who help get the message to its destination.

Multiple Choice

A network is...

• A single computer

• Two or more computers that are connected together to allow them to communicate.

• Three or more computers that are connected together to allow them to communicate.

• Computers that are connected to the internet

​Protocols

​All methods of communication need rules in place in order to pass on the message successfully. These sets of rules are called protocols. What protocol exists for meeting someone new? Is this the same in all countries?

​Protocols

​UK: 

• Smile, and say ‘Hello’

• Shake right hands (shaking left hands is considered disrespectful in many countries)

​Protocols

​In which cultures do people use the below protocols to greet each other?

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Bowing

Rubbing noses

Sticking your tongue out

​Protocols

​In which cultures do people use the below protocols to greet each other?

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Bowing: Japan

Rubbing noses: Inuit

Sticking your tongue out: Tibetan

​Protocols

​It is important that both parties involved in communication know the rules. This is the same with computer network protocols.

​Protocols

​What rules (protocols) exist for an email address?

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​Protocols

​What rules (protocols) exist for an email address?

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An ‘@’ symbol must be used. 

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The email address must be unique.

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What about the protocols for sending an email?​

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​Protocols

​What rules (protocols) exist for an email address?

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An ‘@’ symbol must be used. 

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The email address must be unique.

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What about the protocols for sending an email?​

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​It must have an email address to send to

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It must have a sender

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It must contain something

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​Protocols

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​The protocol used for email is called

Simple Mail Transfer Protocol (SMTP)

​Answer the following questions...

Multiple Choice

What is the name of the network protocol that is used by emails? 

• Sample Mail Trying-to Post

• Several Machines Taking Postcards

• Simple Mail Transfer Protocol

• Should Maybe Transfer Post

Multiple Choice

A network has to consist of at least 4 or more devices

• True

• False

​Go to class notebook. Complete Activity 1

​What do we think the advantages and disadvantages of being on a computer network are?

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Person 1: I think that ....... devices are connected.

Person 2: I agree / disagree / would like to build on that ...​

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​Turn & Talk

Security risks
Network failures
Expensive to set up
Can be slow (too many users)
Privacy issues
Cyberbullying, grooming

Disadvantages

Share files easily
Share devices
Communicate easily
Access the internet
Work together
Save work centrally
Easier to manage (updates etc)

Advantages

Being on a network

Multiple Choice

A computer network can share printers and software.

• True

• False

Multiple Select

What is the benefit of being on a computer network?

• Share files

• share printers

• Communicate with others on the network

• Easily hacked

Multiple Choice

The basic advantages of the computer network is

• Hacking

• easy to communicate

• network down

Multiple Choice

A disadvantages of a computer network is

• Hacking is easier on a network

• easy to communicate

• Can increase your storage capability

Multiple Choice

A disadvantages of a computer network is

• If one PC breaks down can use another on the network

• easy to communicate

• It costs more to set up a network

Multiple Choice

A network is...

• A single computer

• Two or more computers that are connected together to allow them to communicate.

• Three or more computers that are connected together to allow them to communicate.

• Computers that are connected to the internet

Multiple Choice

What is a network protocol?

• A shape of a network, such as star

• A set of rules for sharing data

• The requirements for passwords, such as length

• The size of a network, such as WAN

Open Ended

Advantages of being on a network are.....?

Open Ended

Disadvantages of being on a network are.....?

​Go to class notebook. Complete Activity 2