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What devices do we have here.

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This is a writer.

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This is a Cisco 43 21 rotor.

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I've chosen this road specifically why purchase this right specifically because it's available in Packet

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Tracer.

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This is a Cisco 35 66 switch again 35 60 switches are available in Packet Tracer.

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You don't need to spend money buying all these devices.

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I've done that for you.

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Now obviously if you want to you could buy physical equipment.

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It's nice in some ways to work with physical equipment but for the CCMA you don't have to use physical

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equipment if you can afford it.

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Just use packet tracer and I'll show you in a moment when I boot up this rider and the switch and compare

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it to Packet Tracer you'll see it's very very similar.

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This is an example of a 29 60 switch.

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What I like about these switches is they families.

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So I have them on my desk here and it doesn't make a lot of noise and mess up the recordings but here

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we've got two interesting devices.

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They look very similar very similar to each other.

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But what you'll notice and these are older devices is this is a Cisco AC 55 of 5 This is called a firewall

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firewalls allow us to stop bad people getting into our network so we can restrict who can access our

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network.

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They use what are called firewall rules to permit or deny traffic.

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This is a small little firewall typically used again in a small business.

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The idea here is we can connect a bunch of devices directly to the firewall so it's acting like a switch.

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In some ways but I could specify what's called the outside interface and the inside interface.

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And I do not allow or this firewall does not allow traffic from the outside interface to the inside

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interface unless you explicitly allow it your home rider probably does something similar has a built

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in Firewall your P.C. may be also running a firewall a software firewall directly on the P.C..

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This is an example of a hardware dedicated firewall.

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Now riders as mentioned often have firewall functionality but this is a dedicated firewall.

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Now you could connect your internet directly to the firewall if you haven't Ethernet connection and

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then to the rotor and then to the switch where you're inside devices or or your land is all you could

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connect to the rudder and then have the firewall behind the rudder so you either have the firewall in

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front of the router or behind the router in many cases you're going to have this behind the router because

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your ISP may manage the rudder all you need a physical connection that's not Ethernet.

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These devices typically only support Ethernet Ryder will support other types of technologies such as

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a DSL or cable as an example.

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So the internet connects to the road it connects to the firewall which then connects to your switch

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in your internal network.

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Now he has another device looks very much the same but this is a wireless LAN controller.

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Another small wireless LAN controller.

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You'll notice the form factor looks exactly the same but it has different functionality.

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This is used to manage access points.

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If you've only got one access point it makes sense to manage the access point directly using what's

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called an autonomous access point economists meaning that you don't need a wireless LAN controller to

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manage it.

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But if you've got 100 of these or 500 of these it's going to be a lot of work to manually configure

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every one of those access points.

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So rather than doing that you use what's called lightweight access points.

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Some of these access points support both so they can either be lightweight or they can be autonomous.

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Some of them have to be lightweight access points varies depending on which one you buy.

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But the idea is is if I had 100 of these or 500 of these they would register with the wireless LAN controller.

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Now obviously this is a small wireless LAN controller so it's not going to support as many access points.

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But the idea is if I have 100 access points they would connect to the wireless LAN controller.

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And notice this doesn't have as many ports as as would be required.

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The wireless LAN controller and the bigger ones even more so don't have so many interfaces.

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They simply connect to switches so the access points connector switches the wireless LAN controller

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connects to switches switches are there to provide lots of ports to connect to in the network.

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So the whole idea here is the wireless LAN controller will manage the access points rather than manually

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managing every one of the access points you manage them through the wireless LAN controller.

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So the wireless LAN controller will manage let's say 100 500 access points depends on the controller.

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Depends what it can support.

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So once again here we've got a firewall.

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This is an older firewall.

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USA Today we have what are called next generation firewalls.

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They support features such as IP s or IBS.

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Now intrusion detection.

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Let me give you an analogy so that you won't forget what intrusion detection is an I.D. S is like a

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dog what a dog can do is help protect you by warning you when there's an attack taking place.

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Let's say you sleeping at night sleeping comfortably in bed the dog however sniffs that there's an attacker

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so an intruder it sniffs that there's an intruder trying to break into your house.

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What does it do.

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It box it warns you that there's an intruder.

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It doesn't stop the attacker.

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It warns you that there's an attacker and then you can do something to stop the attacker trying to break

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into your house.

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An intrusion detection system simply detects that there's a problem and then alerts you that there's

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a problem and then you have to do something about it.

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An intrusion prevention system can alert you that there's a problem but also block the attack so it

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can prevent the attack.

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So if someone breaks into your network remotely let's say a hacker it can see that there's malicious

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activity on the network and then it can block that attacker.

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So prevent that attacker from gaining access to your network intrusion detection systems typically set

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out of band of network traffic so the traffic is going past them but they're not in the flow of traffic

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they're just getting copies of the traffic to see if there's a problem and intrusion prevention system

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sits in line with the traffic.

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The traffic is going through the eyepiece or intrusion prevention system.

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When there's an attack it blocks it so the attacker can't get into your network.

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So think of an I.D. S or an IP s as a dog.

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Is it a small dog ideas.

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If it isn't a very large dog eyepiece can go and attack the attacker.

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Hopefully that analogy will help you never forget what an idea or IP SS.