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

wanna be you could communicate create a network between the

the the two offices a few companies because we had to

the kind of money that is required to cable from New York to Boston

and of course if you can get the permissions you could run your own

private cable from your Boston office to New York office no problem at all

but not too many companies have that kind of money

and not many companies would like to we aced that kind of money

be a better way of doing it no

you could connect your office to local ISP

ISP is nothing but Internet Service Provider

and the similar thing happens on the IBM Boston connects

their office to an ISP Internet Service Provider

and ISP's already have the backbone very massive a high bandwidth connections

between the office

she got beat da that you sent from here course through the network to the ISP

from ISB to the ISBE in Boston and then through that

to go back to the Boston office and a computer to this computer

can commit come you keep with this computer absolutely fine

using the ISP not this

farms the wide ATM network bad

lands are into connected with each other to form a very

wide ATM network and wide here signifies

a wide geographical Adia it could be across the country

it could be in different cities and then the same country

maybe a different countries basically it's a web

so dot is how it works now how to how do you connect from highspeed to

York ER a locally and that's what would you can replace p

when non months situation what happens is you

you get a a jack on the wall

you might have a smaller jack on the wall and y'all your land can

lawn you just connected to the jack so from your from the sewage from that out

of your company

you connected to the check back and design a speedy would

the leaked cable maybe they would kill aid under under the

ground bill a cable to the office

and from the office they go here from Denmark of it again maybe underground

daily a cable

Judah Boston office again there will be a wall socket

that is provided and you just blow to keep from the wall to you

your rotor and that's how

you are when link works when this is also

intended to be using the ISP

intimate is nothing but a better team massive

when which covers the entire world

where you have a lot of public resources so

if you google this is the definition of what an

internet is a global computer network providing

about it. of information and communication facilities

consisting of interconnected networks using standardized communication

protocols well that is pig definition I

well that's exactly what it is you know internet

is nothing but you have a lot of and do you have a man here you have a band here

you have a plan here

you have a ban het and then just brands are connected with each other

so you have another ran here and you have another man here

another one here another one here maybe fuel

more here I know in India that up Whitelock

you have all these things and get connected let's when singer connector

from here

connected here from here connected here at these disconnected this is connected

this is going to this is connected this is connected