uccser/cs-field-guide

WEBVTT

Computer Science Education Research,
University of Canterbury, New Zealand
Subtitle file for the video "Network Protocols"
Author: Alasdair Smith
Date: 16/02/2017
Modified by: Courtney Bracefield on 15/10/2019


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Network Protocols

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Talking is easy, right?
We all do it every day.

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Whether it's in person, by email, or by text.

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But what happens when something goes wrong?

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What happens when what we're using to communicate
just isn't reliable reliable relelelelelel.

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We use protocols.

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Protocols is a fancy word for a simple concept:
Communicating formally.

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The stock market's doing so poorly,
whatever shall I do?

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Not like that.
Pilots use protocols.

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Their communication has to be reliable and efficient.

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They have to be able to communicate
with other planes and various airports

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in order to stay safe.

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For example: how do they report their position?
What happens if they don't understand what was said?

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What happens if they don't hear back?

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You can get into some pretty awkward situations.

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- So what runway should we use?
- [Incomprehensible]

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I think he said 'land on the cake'

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Okay, we're landing on the cake.

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What now?

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To avoid this, we use protocols.

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Protocols are a way to formalise communication,
such that we don't get ourselves in trouble.

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That's why pilots are always repeating stuff.
Always repeating stuff.

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And use special codewords to avoid being misheard.

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Christchurch tower, charlie charlie alpha approaching
eastern fire break, one thousand five hundred.

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We have Information Julie at 1-0-3-4 in 4-B-O-B.
Request landing on runway.

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Pilots, emergency services, law enforcement, surgeons,
builders and even you use protocols every day.

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They are essential to effective
and efficient communication.

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Scalpel.

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A lot of people think the internet is bulletproof.
But it's not.

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Messages are lost, corrupted,
and delivered out of order all the time.

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Think about when you send a message on Facebook.

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If we didn't have protocols,
it would look something like this:

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[H3y *>%thony, How a$$re you?!?]

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Luckily, the message arrives on
the other side of the world just fine.

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The protocol is in place to ensure each word or letter
is delivered properly, and if need be, they are resent.

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In this chapter, you'll learn about
protocols such as TCP and UP,

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which are used to build
awesome applications on the web.

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Even people in the film industry use protocols.
For example, to finish filming people say cut.

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- He said cut!
All sorts of people use protocols.
- Good for me

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- I think that's a wrap.
But in this chapter, guys?
- Yep, audio's good.

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Guys?
- See you tommorrow Sam.

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Are we still filming?