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COMPUTER NETWORKS

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Zak Radbourne

on 24 June 2015

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Transcript of COMPUTER NETWORKS

COMPUTER NETWORKS
YOU GUIDE TO LAN, WAN AND MORE.
A network
A network is a series of computers or other similar network devices that are all linked. They are all used on one system so information can be shared between multiple users and loggers.
They can range in size. Smaller and more controllable systems are called LAN's , while bigger and more accessible networks are called WAN's.
Additions to the internet
1994-Yahoo invented.
1994-Amazon invented.
1995-E bay launched.
1998-Google released.
2001-Wikipedia opened.
2004-Facebook launched.
2006-Twitter invented.
2010-Instagram opened.
WAN's
Wide area networks (or WAN's) are used for huge corporation and businesses to insure deals and be accessible to all their workers and suppliers.
ADVANTAGES: They are more reliable in virus and hacking check ups. They can be of an infinite size. Services are almost limitless. Information can be shared between multiple loggers.
DISADVANTAGES: Information can be accidentally leaked easily. Can be extremely expensive to instal and keep running. Loggers can be separately hacked.
Landmarks of the internet
In 1971 the first E-mail was sent successfully.
1974 is widely considered the birth of the internet as Vinton Cerf and Robert Kahn designed and started developing the TCP. This is a system organizing messages over the internet.
In 1991 the WWW is produced and made. This is mainly considered to be the internet and Tim Bernese-Lee is credited with following through J.C.R. Licklider's dream.
LAN's
Local area networks ( or LAN's ) are used by schools, campuses and big buildings. They are there to be used by multiple loggers in the same or near buildings and they can share info and applications on it.
ADVANTAGES: Problems can be identified quickly and easily, are generally be cheaper then WAN's, information can be uploaded quickly.
DISADVANTAGES: Less reliable system checkups, less frequent updates to the systems, less range, lower amount of applications can be added or expanded.
Origin of the internet
The original concept of the internet was created by J.C.R. Licklider. In 1962 he became director of a major company and pitched his idea of a galactic network of systems. It finally started production in 1968 and it was revealed to the general public in 1969. Later that year the first message using the internet was sent, however it crashed and what was meant to be LOGIN was sent as LO. It is still however a great achievement in the life of the internet.
What does the internet do?
The internet allows hundreds of thousands of computers and other devices to connect to one almost infinitely ranged server. This is enabled by fiber optic broadband, satellite signals, wireless connection, wires, radio waves, communication towers among others.
It is an ever evolving system and is constantly being adapted and added to. Gradually (as it contains elements and systems of TV broadband and telephone lines) it is also replacing many other systems and very soon it will take over every and all of human life.
How the Internet actually works?
The internet is simply thousands of WAN's and LAN's all connected together using connections. All information that is shared is separated into tiny parts and sent through multiple routes. This way the information can be received even if some of the main routes to the target is blocked or shut down.
The World Wide Web
Commonly mistaken as the internet itself,
it is not, even if it takes most of it up. The world wide web is essentially a system of most web servers which all connect in a interlocking way. This is how our brain works and so helps us interpret data and connect to others, even on different web servers.
Non World Wide Web servers
Although taking up the majority of the internet, the WWW is not all that the internet provides. Apps and games that are not found on search engine or the WWW are also a part of the internet. These servers allows you to connect to other computers and internet providers, however only to ones that are using the same server as you. This is why people commonly use the WWW.
The history of
The history of
Google is a globally used and recognized sight used by practically everyone. So how has it become such a big company and what things has it done to insure its place at the top? It all started in 1996 when Larry Page and Sergey Brin started a information sharing service called Backrub.
Eventually this name was ditched for one that represents seamless infinite info: Google. Since then the company has grown without looking to stop, adding multiple offices, different language versions of the site and multiple different google websites including the majorly popular Google images, Google Maps, GMail, and Google Earth.
The history of Google part 2
To ensure constant expanding and keeping on top of the competition Google has since acquired lots more companies and invested in even more global offices.Despite their digital existence this has not limited them from effecting worldwide issues. They have invested in multiple charitable and eco friendly events.
As well as this Google encourages their workers to take time off ans enjoy themselves. This has enabled the company to be a globally loved web network. an example of this can be the amazing logos they produce nearly everyday.
As well as all this Google has started other companies such as Android and the Nexus tablets/phones.
Facebook is the biggest and most popular social network sight in all of history. Its so big that they were even offered 1 billion dollars BEFORE becoming so popular and has since even inspired a film flick!
It was founded by a 23 year old Mark Zuckerberg while still in college and it became an instant hit among classmates. Since then it grew to reach across all US schools and eventually the whole world. Its services have expanded to liking, sharing, posting and also users can use programs and applications within the site.
It is such an achievement example of a WAN originating from a LAN that it has been tackled by high profile layers and still stands tall. As well as this Mark has since rejected offers of over 2 billion dollars from companies such as Google and Yahoo.
Binary Code
This is the code on which all computers and devices understand. Unlike us these systems dont count or interprit things like us. They only understand anything if it is coded using only the number 1 and 2. This means that when we type every letter, symbol and number (except 1 and 0) are transformed into their binary alter ego.
Understanding Binary Coding
Binary is the basis of all computer networks. So how does the system work? When we type 2 what does the computer see. Well 10 actually. The system works so that only 1 and 0 need to be used. O represents a number not present, while 1 represents and singular one of this number.
The basis is doubled. It starts with 1 then 2 then 4 then 8 and so on. So you start with the biggest number that fits in your chosen number and work your way down. If it doesn't fit it gets a o and if it does it gets a 1. So 2 gets one 2 and no 1 as it no longer fits; making 10. Binary numbers that will not be used for numbers are used to represent other things that a computer may need to interpret such as pixels, letters, sounds, and symbols.
NETWORK DEVICES
HUBS:

This is an advanced hardware device that connects all computers in one network together. It allows the computers to easily communicate together, and they all connect to a single point( a port ). The computers are connected to the hub through several ports.
ROUTERS:
This is a standard device which allows computers to connect to one another and use the same wi-fi connection. They connect to a computer using either an Ethernet cable or a wireless connection using antennas sending signals.
SWITCHES:
Without these, routers wouldn't even exist. This is the thing that actually makes the network in the first place. They serve as the controllers and are what allows computers to access each other.
More network devices
Network Cards:

This is the little card inside computer devices that actually allow them to communicate within its network.
Wireless Access Points:
This is a device which controls how wireless devices are accessible in a wired network of devices. It usually is originally connected to a router and connects wireless devices to the net.
Modems:
A clever device which converts signals like analogue or radio wave into the digital signal of computers binary code or vice versa. This process is described as modulation and demodulation.
HOW THE INTERNET HAS ADVANCED
Everyone Connected
The future is bright
Darker futures
Once upon a time only about 20 years ago the internet as we know it didn't exist. Nobody had access in their homes and even seemingly simple ideas like hyperlinks were thought of as impossible tasks. But the internet advanced at full pace. Ten years later and practically everyone had a computer, phones were starting to access it and things like Facebook were taking shape. Fast forward to today and everyone's got a smart phone, playing games with people on the other side of the planet, the internet is accessible on practically every device and networks are used by practically all companies.
All devices everywhere will be connected. You will be able to turn the kettle on before you get home and log anything you want anywhere and access it everywhere else. All your issue will be gone: a Birthday coming up? The internet will use their browsing and shopping history to tell you exactly what they will want. Wait your phone has just told you your trains canceled! Don't worry an alternate route just popped up.
Just a little while longer until we will look back on things like internet lag and leaked data and think of it like we do record tapes: a thing of the past. The internet will run everything and could even go as far as to save lives. By using this unlimited system of unregulated data doctors could access your medical history in a flash and save you.
Things like Google glass also give us hope that we will be able to access the internet through use of everyday objects. Consequently the internet will know everything about us, even more than we do. This could allow the internet to organize our lives and help us in various ways, but unfortunately it also will have multiple repercussions as well.
As the internet is so important to our modern lives and is only going to get more so, many people and organizations have tried to predict the future of this great system. And although everyone agrees that it will get bigger literally and more involved in our lives, practically everyone thinks it will happen in different ways.
Some say the internet will be so big that it will be accessible anywhere due to electricity signals to wearable devices like gses or your phone. The internet may log everything you ever do on a system that people will be able to access in the future. Education may be "remade" on the internet so no money is spent on more schools or teachers and you access your learning digitally.
Laws will be forced to reach into the digital medium and eventually all countries will have to share the same rules as criminals will hack into devices located at different countries. As communication across the globe will become seeming less we may have to all speak the same language!
The networks may all become one network run by multiple servers so that it is even easier to access all the information. That way even if one network crashed another would just run your device.
Yes all data will become available, yes the internet may be accesible anywhere on the planet and yes communication is only going to become easier. However is all of this really a good thing? What consequences will there be for one big effortless network of almost infinite data.
Well look how much issue we have now: hacking, trolling, cyber-bullying, pranks, privacy, over used advertising, stalking, pornography, pedophilia and fake accounting. As the internet increases so will all these issues. Not only this, but new issues like international crimes and no privacy will rise as well.
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