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So far, we have learned a lot about networking standards and related technologies and even know how

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to make computers and devices communicate so that you can get a network up and running.

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But there's more because network security is absolutely critical.

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I'm going to equip you with the knowledge you need to keep your network safe from hackers.

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Yes, communication and accessing the information you need is all good, but knowing the exactly who

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is at the other end of the connection is also vital.

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Now, this means that you need ways to confirm that the person or the computer at the other end of the

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connection is really supposed to be accessing the resource it's trying to.

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And even whether the resources or the entities that we are contacting are really who and what they appear

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to be.

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Seriously, if you don't have network security firmly in place, you are flying dangerously blind.

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You could be inadvertently exposing critical data to people who have no right to see that information

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and may even intend to exploit it in a big way.

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So in this section will focus on some very important pieces of the security puzzle.

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The first things that are security filtering and user authentication, the how do we know who is really

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at the other end of our connections?

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The answer to that may seem simple enough because the computer or the person on the other end must identify

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him or herself, right or wrong.

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That's not good enough because people, especially hackers, lie.

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So it's totally naive to assume that person or computer on the other end of the line is who they are

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claiming to be sacked.

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But true hackers use many tools out there today with the precise goal of convincing us that someone

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else, that is to try to impersonate people.

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And we all know that someone has been a victim of this and they have failed to identify theft.

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And that is why, thanks to the bad guys with the right spoofing software in hand, which helps us make

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it easier to identify them.

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This means it's imperative to control who or what can get into one network by identifying the specific

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computers.

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Well, for starters, I'm going to cover some basic ways to safely allow the computers.

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You want to have access in your network, plus keep the weeds out of the ones you honestly don't want

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people to.

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The first line of defense is something called security filtering, which broadly refers to the V's to

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let people securely access your resources.

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This process is twofold, and it includes ensuring that only authorized computers get entry to a network,

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making sure that the data you are sending back and forth between the networks is secured so that it

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can be intercepted and translated by bad guys.

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It's sorry and it cannot be intercepted by bad guys.

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And that is why we need a security filtering and the idea of network security.

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So this was it for this lecture.

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So the basic idea of security filtering, as the words suggest, is to disallow bad guys from entering

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into your network and not allowing them to tamper with your data.

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So there are various security filtering techniques like access control list encryption, which we are

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going to see in this section.

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So let us get started with the next lecture.