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OK, so in the last lecture we saw that switches earlier to devices, which means this segment, the



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network within the Mac addresses.



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Now, if you see the familiar three switch, that means you're referring about the router and not a



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layer to switch off.



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Sometimes routers are also called as layer three switches, so don't get confused between them.



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The term router and the layer three switch are interchangeable.



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Now, what is a router router is a network device used to connect many sometimes disparate network segments



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together, combining them into what we call the in the network that is the Internet that you are using



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today.



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Oh, well, configured router can make intelligent decisions about the best way to get network data



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to its destination, so it gathers the information it needs to make these decisions based on the network's



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particular performance data.



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Another important thing is routers use IP addresses to make the forwarding decisions.



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They're considered as layer three devices because IP addresses are used at least three and Mac addresses



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are used at to now on the screen again.



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So.



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On the screen, you can see a Cisco router, which is a typical device which is used to connect to the



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Internet.



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Now.



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Rorters can be Multiphasic devices to behave like computers and to themselves with their own complex



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operating systems.



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For example, Cisco does have their own operating system.



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Who can even think of them as sleep users are totally dedicated to the process of routing packets.



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And due to their complexity and flexibility, you can configure them to actually perform the functions



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of other types of network devices.



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Now, rorters can have many different names in the beginning of this lecture, I have told you that



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Routley also known as alertly switch, or it is also known as a multilayer switch.



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Remember, if you hear the word switch, it means little to do.



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It's OK if you just hear the word switch, it means later to reverse routers.



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Layer three switches and molecular switches mean the same.



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Now, as you can see on the screen, there is a router which is held to connect to different network



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segments and make use of the laser pointer here.



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Yeah, so this is a router which is used to connect this network and this network.



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So if Bc5 if this PC, OK.



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Now, if this PC wants to transfer the data to, let's say, PC three.



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So how will it go?



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It will transfer the data to this packet.



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Now, this is a hub and we have seen that hub transports data to all other PCs.



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This data will for will be forwarded to this all the pieces, and then it will also forward to this



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PC as well.



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And after this, the hub sends the data to router router checks if this data is present for which Internet



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work.



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So as the intended data is four out of five I'm sorry, PC three of the other segment that out properly



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routing data to the switch.



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Now on the switch there is a packet and in that packet it is the time that it is for PC five.



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OK, it is four, PC five.



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So now this switch now we all know that switch does not broadcast the packet to all other hosts.



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It simply transfers this packet to PC five.



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So in this way, the networking device Bc5 of segment one.



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This is the first segment.



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And this is the second segment, so pick one.



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P.S., five of four segments will transfer data to ABC three now in this diagram explaining we understood



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the concepts of hub and switch.



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So I hope you are now comfortable with all the three devices hub.



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Serrato and switch, right, I hope you understand these devices correctly, because these are the most



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important devices in any networking and you must understand the basic difference between all these devices



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now before moving ahead.



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You can see that I have taken enormous efforts to explain you all the concepts in very basic form.



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So I request you to please leave a rating for our course because, you know, leaving a rating will



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also help other students to know about this, because now we are not doing this for the money purposes.



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We are just doing so that you can understand.



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And if you find out that art is the only course on computer networking, which will explain you in every



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detail.



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So if you're enjoying the scores, please write us a review.



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And if you have any grievances, let us know through the question and answer session.



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We will try to address them as fast as possible in the next lecture.



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We'll talk about firewalls.



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Then we'll get to know InterXion about ideas and ideas and other devices.