So far, we have learned a lot about networking standards and related technologies and even know how
to make computers and devices communicate so that you can get a network up and running.
But there's more because network security is absolutely critical.
I'm going to equip you with the knowledge you need to keep your network safe from hackers.
Yes, communication and accessing the information you need is all good, but knowing the exactly who
is at the other end of the connection is also vital.
Now, this means that you need ways to confirm that the person or the computer at the other end of the
connection is really supposed to be accessing the resource it's trying to.
And even whether the resources or the entities that we are contacting are really who and what they appear
to be.
Seriously, if you don't have network security firmly in place, you are flying dangerously blind.
You could be inadvertently exposing critical data to people who have no right to see that information
and may even intend to exploit it in a big way.
So in this section will focus on some very important pieces of the security puzzle.
The first things that are security filtering and user authentication, the how do we know who is really
at the other end of our connections?
The answer to that may seem simple enough because the computer or the person on the other end must identify
him or herself, right or wrong.
That's not good enough because people, especially hackers, lie.
So it's totally naive to assume that person or computer on the other end of the line is who they are
claiming to be sacked.
But true hackers use many tools out there today with the precise goal of convincing us that someone
else, that is to try to impersonate people.
And we all know that someone has been a victim of this and they have failed to identify theft.
And that is why, thanks to the bad guys with the right spoofing software in hand, which helps us make
it easier to identify them.
This means it's imperative to control who or what can get into one network by identifying the specific
computers.
Well, for starters, I'm going to cover some basic ways to safely allow the computers.
You want to have access in your network, plus keep the weeds out of the ones you honestly don't want
people to.
The first line of defense is something called security filtering, which broadly refers to the V's to
let people securely access your resources.
This process is twofold, and it includes ensuring that only authorized computers get entry to a network,
making sure that the data you are sending back and forth between the networks is secured so that it
can be intercepted and translated by bad guys.
It's sorry and it cannot be intercepted by bad guys.
And that is why we need a security filtering and the idea of network security.
So this was it for this lecture.
So the basic idea of security filtering, as the words suggest, is to disallow bad guys from entering
into your network and not allowing them to tamper with your data.
So there are various security filtering techniques like access control list encryption, which we are
going to see in this section.
So let us get started with the next lecture.