OK, so now let's start with VPN.
Now, nobody's virtual private networks aren't really that hard to understand.
I want to explain in really simple words, a VPN that is a virtual private network.
It fits somewhere between the local area network that we are connected to and the wide area network
that connects to our more lands.
And many times may seem just like a vine link because your computer on one LAN connects to a different
remote land and uses its resources remotely.
That is the basic definition of a VPN.
Now the key difference between the virtual private networks is a big one security.
So the definition of a connecting a LAN to a one may sound the same, but VPN is much more secure.
Now, here's the difference.
A typical wide area network connects two or more remote local area networks together using someone else's
network like, say, your Internet service provider and router your local host and router see these
networks as remote networks and not as local networks or resources.
This would be a van in its most general definition, right?
So VPN actually makes your local host part of the remote network by using the van link that connects
to the remote LAN.
Now, the VPN will make your host appear as though it's actually local and remote network.
This means that we now have access to the remote local areas resources and that access is very secure.
This may sound like a lot like a villain definition that is a virtual land, that is take my host and
make it appear local to the remote resources.
Just remember that for networks that are physically local, using virtual land is a good solution.
But for networks that are physically remote, those that span a wide area, network weapons is the best
solution for a simple VPN.
Let's use a home office in a country or a city.
And, you know, on the screen you can show you can you can see this figure.
So what basically is going on?
I am sending data to someone on the Internet through a tunnel.
Now, this is a preventive tunnel through which I'm sending a data and whoever is trying to access is
getting rebundled.
So neither hacker nor the government can see what is sending between the data.
And that is why many people use virtual private networks.
Now, in some cases, the let's say if you're watching a Netflix movie now, if you are from India or
from us, some movies of, let's say, European countries are not allowed to be broadcasted in your
country.
So what most people do is they make use of VPN, which means that I suppose this is Netflix and this
is you you are trying to directly access Netflix, but you are not able to do that.
So I'll use this.
So if I drink trying to use Netflix, you are not able to do that.
So what you do is you access Netflix through this country, this ISP of, let's say us, and then this
ISP sends packet to the Netflix and let us say this, ISPs from a country where the movies are allowed
to broadcast.
So what is this here?
So what does this Netflix things that the packets are received from European country and now I can permit.
So these data, this data is again transmitted to the ISP of the country in which the movie is allowed.
And again, this ISP sends the data back to you.
So in this case, instead of this channel, they can you use a VPN here?
So what, uh, what actually, uh, the user or you use it, you use a VPN here, a virtual private
network through which the data is getting transferred.
So now there are different types of weapons.
Now, why is this so important now?
Because, uh, the types of weapons are named based on the kind of role they play in the real world
business.
So the first one is client to client virtual private network, which is also known as a remote access
virtual private network, not a remote access virtual private network allows remote users like telecommunications
to securely access the corporate network wherever and whenever they need to.
It is typical that users can connect to the Internet, but not to the office.
Why are they VPN client?
Because they don't have the correct VPN address and password.
This is the most common problem and one should always check first before trying to access the resources.
The next one is host to host weepin, a host to host a virtual private network is somewhat like a site
to site in concept, except that the end points of the tunnel are to individual hosts.
In this case, all the traffic is protected from the time it leaves the network interface card of one
host until it reaches the network interface card of the next host.
Which means if you are trying to communicate with your friend and if you are using a VPN that is a kind
of a host to host virtual private network, site to site, virtual private network.
Now site to site weapons are also known as Internet weapons allows a company to connect is remote sites
to the corporate backbone securely over a public media like the Internet.
Now, instead of requiring more expensive area that is a wide area network connections, this is probably
the best solution for connecting remote office to a machine company.
So if someone asks you how do you connect your remote office to the main company headquarters, the
answer is site to site virtual private networks.
And the last kind of VPN is extranet VPN Extranet Vivienne's allows and organization suppliers, its
partners and its customers to be connected to the corporate network in a limited way for only business
purposes.
So these are the types of weapons that you need to remember from the exact point of view or any example
where you're going to appear on an interview you're going to appear for.
Just make sure that you remember the definition of VPN.
Why do we require Ripkin?
The answer is for security purposes.
And just remember the four types of weapons that we have just discussed.
That is it for this lecture.