LAN stands for local area network. This means it interconnects with either a home or business site full of computers . it how the internet was born on each pc. A LAN is useful for sharing recorces like printers and files to each computer.
Advantages of using LAN:
they are easy to set up.
they are convenient.
they are also easy to expand.
they connect computers together like marriage
they can now share recourses.
Disadvantages of LAN:
they are not very secure.
limited to a certain geographical area.
need to maintained many times.
not very particle over wide areas.
Hardware.
THE INTERNET
a software consultant named Tim Berners-Lee at the European Organization for Nuclear Research hatched a plan for an open computer network to keep track of research at the particle physics laboratory in the suburbs of Switzerland. Berners-Lee's modestly titled "Information Management: A Proposal," which he submitted to get a CERN grant, would become the blueprint for the World Wide Web. AND THUS THE INTERNET WAS BORN.
The Internet protocol suite is the networking model and a group of communications protocols used for the Internet and similar networks. It is commonly known as TCP/IP, because its most important protocols, the Transmission Control Protocol (TCP) and the Internet Protocol (IP), were the first networking protocols defined in this standard.
Types of LAN setups:
Star topology,
shared link to servers, most common, few data collations, fast, can set up independent segments.
Bus Topology,
good things: one common linking cable, cheapest of them all, nodes connected off the cable.
bad things: slows down when heavy traffic, lots of data collisions, bad cable effects whole network, limited distance is possible.
Ring Topology,
one common linking cable, passes all nodes, one direction travel, fast performance, however... a single problem and the whole network goes down.
DNS DNS DNS!!!!!!!!!'
A DNS (domain name server) is a server that allows the translation of a desired domain, like www.reddit.com, into an IP address which the Internet is based on. So every time you use a website a DNS finds the corresponding IP address. However the interesting thing about DNS systems is: they are in fact their own network, so if one DNS server doesn't recognise or cannot translate it will go and ask another one.
Now, when you enter the web address "www.neatorama.com" it is in an alphabetic value so it needs to be translated into a IP address so the Internet knows where to go. It will go through your routers cache to check if it was recently visited, nope! So it goes to a DNS through the DNS servers till it is translated into an IP address. So the computer now sends off the IP address it received and carries on its way to "neatorama?"
Advantages:
Easier to remember instead of lots of numbers.
Easier for categorising.
And is the sole reason search engines work.
Disadvantages:
Spoofing DNS would result in data being left in the wrong hands.
Breaking an important DNS server would be very dangerous to the Internet.
The Internet was made without wanting to be decentralised, DNS makes it centralised.
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