Placeholder Image

Subtitles section Play video

  • Cisco Certified Network Associate

  • Day One. Welcome back everybody.

  • I am Imran Rafai, your trainer for this entire series.

  • Today we would be starting with network fundamentals

  • and when I say fundamentals we would deal with the

  • very very basic of the networking

  • industry. So this video is not

  • only for the people who are going for the CCNA certification but

  • anybody who's interested to, OR looking to start a career

  • in networking feel free to watch this because you

  • are going to learn as lot. But CCMA as a certification, is a very valuable

  • certification and I urge everybody to go ahead and

  • take that certification because it is gonna add a lot of value.

  • Before I go any further I would ask

  • everybody to concentrate on the first three days

  • of our video because we will be covering

  • the very basic concepts

  • which, if I can dare, I would say

  • is going to be the base

  • of your entire networking career, maybe even twenty years from now.

  • So please concentrate and

  • be clear with every concept we cover here.

  • And in case you still have doubts please feel free to email me

  • at imran.rafai@NWKING.ORG

  • imran.rafai@NWKING.ORG

  • imran.rafai@NWKING.ORG

  • imran.rafai@NWKING.ORG

  • Alright, without further ado, let

  • us get into the video. Let's start with the

  • very basic question, "What is a network"

  • well when I asked this question to my students

  • more often than not I get answers like Facebook

  • Twitter Picasa whatever whatever you see on the screen but

  • well that is social network, that's not the network we are here to learn

  • and that definitely is not the network I am going to talk about

  • what I am intrested in is it

  • this network the network between computers

  • well this network is also the foundation or the base on which

  • applications like Twitter Facebook picassa

  • is built on. So we learn about

  • this network and maybe if we have time over the course of this

  • this series, we will talk a little bit about those

  • applications here and there. While preparing for this

  • video lecture

  • I was preparing this a image that you see on the screen and I was thinking

  • okay let me see how to explain this concept

  • to students who are starting

  • on at the networking industry so

  • how do I explain this concept without actually using a lot of technical terms

  • Or saying - 'okay this thing communicates with that

  • thing over this thing' - I mean it was difficult

  • and then I thought okay I need a better way to explain this and I i remember the

  • story that a teacher of mine told me when she taught me

  • networking. It is about

  • the olden days of how Kings exchanged messages with

  • the ally, they would pass the message

  • to a messenger who used to ride on ha specs

  • and this go through all these number the peep

  • pot along the road and in the is to go through this did the city gate and then

  • this go to other King and deliver the message

  • so if you compare that to computer network

  • the the messenger sending the message

  • so the message is like the detail that you send in the data could be anything

  • it could be a good

  • doc file a Word document or it could be an excel file it could be any major

  • could be you BDO it could be anything that detail

  • and abroad on which the the messenger traveled

  • that that basically is the network course

  • computer network has much more interesting than just paving

  • drawers up but

  • if you if you see backed is the very pleasing my computer netbook is

  • invented to communicate between computers

  • if you see this image you would see let me just take a

  • a highlighter you will see that we have the Windows PC

  • we have Linux systems an iMac

  • and we have laptop more bite for on palm top

  • you have bebe so is maybe it's running on saint always him database server

  • spite service but

  • in spite of the all running on different operating systems

  • they all can communicate absolutely perfectly with each other

  • this is the magic of computer networks

  • the computer network runs on ok

  • a global standard called or same orders sand and

  • and things like that which defines clearly what

  • when any manufacture manufactures its a networking device

  • what time how they should communicate with each other

  • so the only language of networking

  • and backed enables them to communicate with each other

  • let's try to break this a little more further and see

  • how internet works

  • so if you look at the picture on your screens

  • this is the very basic network

  • to computers connected with the wire in this case we will use

  • a catfight cable a cap to keep a look something like this:

  • and this has becoming different colors you have

  • blue-collar ones red color ones from and this is this obviously another color

  • and this the out a Kabul is just a protective layer

  • inside you have eight tiny keepers

  • these keep it going to a connector called RG fortify keep it

  • that looks something like this that you see on the screen and back of your

  • computer

  • and most the computer that you have today

  • you have a port adj a port like this

  • that is yard interferes your network interface card

  • so your network interface card is ready RG fortify connects

  • and using this you can communicate

  • these two computers can communicate with each other this

  • is the very basic form of networking and this is called as

  • Ethernet ET hedge

  • E arson net Ethernet let me just

  • right down its E sorry book my handwriting and

  • it's very difficult to right on screen

  • especially with my mouse bat lemme

  • chess eat net

  • maybe for my next video out by ice time is so that I can just

  • right tit more legible

  • handwriting alright but for now up

  • yes at this key believe connects between these two computers

  • and you can have a very basic network

  • but what happens if you have more than to computers so

  • let you have fight computers me you obviously kit I mean there's one we

  • obviously can't go on adding more

  • meet network interface cards on your computer then you can have

  • but a better bf connecting is by you making use of a networking device

  • maybe a switch or hub of course which and how but two different devices

  • they have totally different functions we will obviously learned about them in

  • future we do. pursuits

  • backed up for now you know we have a networking device in this case is a

  • switch

  • and these computers can communicate with each other

  • so for instance this guy is caught over a document that he want to send across

  • the network to this guy all he has to do is centered across

  • to use IP address what is an IP address

  • you would ask IP addresses how

  • computers to recognize each other on the network

  • the BB learn about IP addresses in the next

  • I video series but for now just not be a identifiers

  • for computers another

  • critical reason why people use networking is

  • because of devices like this in a maybe let's assume that this was a very

  • expensive

  • printer or scanner that the company invested in

  • if networking was not available the wheat this device be connected is

  • to this let me just check the college's sure that it is

  • I okay lets you select to this is

  • it would have had to be connected directly to the computer

  • no let's assume that this user maybe print one

  • beat Adi and maybe all the

  • users in this computer in this company has similar requirement that they have

  • to pre wanna poop eaters

  • every day so the company will have been missed on more

  • printer still have one more print area this guy will have one more printer

  • so company will have unnecessarily

  • invest on a lot of printers been the uses of damn

  • in all the sprinters are gonna be very very minimal

  • better before computer companies to invest money on IT infrastructures to

  • how one compute one printer

  • very expensive good quality printer light onto the network and everybody can

  • print to it

  • that's a lot of money saved and that's very efficient way of using

  • it. budget

  • so backed is the very basic

  • requirement and the reason why we have computer network

  • so a computer network in a local office you know maybe one

  • home office and a rule mine are in a single company that's called as a lamb

  • local area network and local signify that is very local

  • to a geographer clearly a

  • if this seem local lantz not desert

  • Lance and you have not the land here

  • and let's assume that your company has two offices one in New York and then you

  • have another office in Boston