1 00:00:00,253 --> 00:00:06,099 In the previous video, we have done create the most simple computer network in Cisco Packet Tracer, 2 00:00:06,099 --> 00:00:12,000 which is connecting two computer. Here we have PC 0 and PC 1, 3 00:00:12,045 --> 00:00:20,663 and these two PC is connected using UTP cable. The IP Address of PC 0 is 192.168.1.1, 4 00:00:21,360 --> 00:00:25,939 and the IP Address of PC 1 is 192.168.1.2 5 00:00:26,871 --> 00:00:34,054 Now, in this video we are going to learn more detail about IP Address. If you forget about IP 6 00:00:34,054 --> 00:00:40,876 Address, I already say in the previous video that IP Address is the name of computer 7 00:00:40,876 --> 00:00:47,752 in the computer network. Computer will use IP Address to communicate with other computers. 8 00:00:48,576 --> 00:00:56,795 IP Address is consist of 4 parts of number. Let’s say x.x.x.x 9 00:00:57,410 --> 00:01:03,522 and each part of IP Address is number between 0 and 255. 10 00:01:04,176 --> 00:01:12,000 So there is impossible to have minus number in IP Address. It is also impossible to have number 11 00:01:12,000 --> 00:01:22,263 more than 255 in IP Address. So, remember that the number in IP Address always between 0 and 255. 12 00:01:22,640 --> 00:01:30,434 The example of IP Address is that we used in the previous video, which is 192.168.1.1. 13 00:01:31,280 --> 00:01:38,926 So actually the number is not always 192, you can use any number between 0 and 255. 14 00:01:39,627 --> 00:01:47,065 And then, in the IP Address we also have a slash like this, here I have /24. 15 00:01:47,690 --> 00:01:58,280 Slash in IP Address like this is called prefix. So the prefix for this IP Address is /24. 16 00:01:59,035 --> 00:02:07,085 So what is the function of prefix? Prefix is used to tell us how many IP Address that we can use. 17 00:02:07,686 --> 00:02:15,448 In this case, the total IP Address that we can use for prefix /24 is 256. 18 00:02:16,311 --> 00:02:24,216 If you don’t know how to get 256 yet, don’t worry, we will learn more about this in the next video. 19 00:02:24,907 --> 00:02:31,185 The only thing that you need to know for now is, that prefix is used to tell us how many IP 20 00:02:31,185 --> 00:02:40,349 Address that we can use. And in this case we can have 256 IP Address in prefix /24, 21 00:02:41,360 --> 00:02:46,008 so we can have 256 computers in our computer network. 22 00:02:47,120 --> 00:02:55,216 Next, we will also learn about Subnetting. So what is Subnetting? Subnetting is used to determine 23 00:02:55,216 --> 00:03:02,500 the best prefix we can use in the computer network. Let’s say we have an office with six computers. 24 00:03:03,696 --> 00:03:12,194 And we want to build a computer network between this six PC. The question is, which prefix the best we can use? 25 00:03:12,400 --> 00:03:22,221 If we use prefix /24, we know that the Total IP is 256, absolutely this is not suitable for our case. 26 00:03:22,656 --> 00:03:31,925 Because we just need six IP. If we use prefix /24, we will have 250 IP that not used. 27 00:03:32,561 --> 00:03:40,967 So, which prefix is best for six IP or six computers? The answer is /29, why? 28 00:03:40,967 --> 00:03:49,592 Because in prefix /29, the Total IP is 8. This is enough for six IP or six computers. 29 00:03:51,200 --> 00:03:57,846 If you have a question, where we get 8 from prefix /29? Once again, 30 00:03:57,846 --> 00:04:03,762 you don’t need to worry about that yet, we will learn more about that in the next video. 31 00:04:04,631 --> 00:04:13,347 Okay so now I hope you understand what is IP Address, what is prerfix, and what is subnetting. 32 00:04:13,600 --> 00:04:18,085 In the next video, we are going to start learning about subnetting. 33 00:04:18,445 --> 00:04:21,600 Thankyou for watching and see you on the next video!