1 00:00:00,555 --> 00:00:06,505 In the previous video, we already learn about what is IP Address and what is subnetting. 2 00:00:06,695 --> 00:00:11,117 And as I said, now we are going to learn about subnetting. 3 00:00:11,501 --> 00:00:17,572 But before that, we are going to learn about Public IP Address and Private IP Address first. 4 00:00:18,127 --> 00:00:24,717 So what is that? Public IP Address is the IP Address that used in the internet. 5 00:00:25,167 --> 00:00:32,386 For example is the IP Address of google, facebook, youtube, twitter, and others. 6 00:00:33,291 --> 00:00:36,096 All of that is using Public IP. 7 00:00:36,527 --> 00:00:44,863 Let’s say here we have Internet, and here we have some server, let’s say facebook.com, 8 00:00:45,000 --> 00:00:51,586 youtube.com, google, and others. There is many server that connected to the internet. 9 00:00:51,716 --> 00:00:57,000 And all of this server is using Public IP Address 10 00:00:57,876 --> 00:01:03,959 The main characteristic of Public IP Address is that they are accessable from anywhere. 11 00:01:04,353 --> 00:01:12,074 Let’s say we are in home, we absolutely can access facebook.com, youtube.com, google.com and others. 12 00:01:12,516 --> 00:01:18,384 Let’s say we are in the office, we will also able to access facebook.com, 13 00:01:18,384 --> 00:01:21,531 youtube.com, google.com and others. 14 00:01:21,926 --> 00:01:28,877 And let’s say again we are in the vacation to another city or another country. We will still 15 00:01:28,877 --> 00:01:37,705 able to access all of that servers. Why? Because all of that servers is using Public IP Address. 16 00:01:37,953 --> 00:01:43,531 So remember that Public IP Address is the IP Address that used in Internet, 17 00:01:43,531 --> 00:01:49,453 the main characteristic of Public IP Address is that they are accessable from anywhere. 18 00:01:50,152 --> 00:01:57,318 Next, about Private IP Address. If Public IP Address is IP that used in the Internet, 19 00:01:57,636 --> 00:02:07,086 then Private IP Address is IP that used in the local Network. Let’s say in the office we have six computers. 20 00:02:07,086 --> 00:02:14,880 Absolutely each of this computer will have an IP Address, we have IP for computer 1, 21 00:02:14,880 --> 00:02:22,706 computer 2, computer 3, computer 4, computer 5, and also we have IP for computer 6. 22 00:02:23,153 --> 00:02:27,550 And then all of these computer will be connected to a switch. 23 00:02:29,730 --> 00:02:38,122 From the switch will be connected to a router, and from router will be connected to 24 00:02:38,122 --> 00:02:45,583 Internet Service Provider or ISP. And finally from ISP will be connected to Internet. 25 00:02:46,381 --> 00:02:54,760 You need to pay attention on the IP address of all PC. All of this IP Address is Private IP Address 26 00:02:54,760 --> 00:03:00,285 The main characteristic of Private IP Address, is that they are only accessable 27 00:03:00,285 --> 00:03:06,932 from the network. We can’t access this IP Address form another network. 28 00:03:07,515 --> 00:03:11,572 So let’s say that this ISP has another client. 29 00:03:11,837 --> 00:03:16,914 They have a router, they also have a switch and some PC. 30 00:03:17,777 --> 00:03:24,080 Well, all of this computer will not be able to communicate with our computers. 31 00:03:25,004 --> 00:03:32,370 Why? Because our computer is using Private IP Address, and remember that Private IP Address 32 00:03:32,370 --> 00:03:39,691 only accessable from the network it self, we can’t access Private IP Address from another network. 33 00:03:40,850 --> 00:03:48,000 So now we understand that Public IP Address is used in the internet and accessable from anywhere. 34 00:03:48,248 --> 00:03:55,296 While Private IP Address is used in the local network and only accessable from the network it self. 35 00:03:56,033 --> 00:04:01,440 And something that you need to know, is that if you build a computer network, 36 00:04:01,440 --> 00:04:08,532 make sure that we us Private IP Address. Where Private IP Address Range is already defined. 37 00:04:08,891 --> 00:04:12,212 Here is the range of Private IP Address. 38 00:04:12,822 --> 00:04:25,147 First, we have 10.0.0.0 until 10.255.255.255. this is the first range for Private IP Address. 39 00:04:25,887 --> 00:04:36,747 Let’s say we have IP 10.1.1.1, this is Private IP, why? Because this IP is included in this range. 40 00:04:37,184 --> 00:04:45,760 Another example, let’s say we have IP 10.100.10.1, this is also Private IP Address. 41 00:04:46,488 --> 00:04:54,278 But, if we have an IP Address 11.10.10.10, this is not Private IP Address, 42 00:04:54,728 --> 00:04:59,172 why? Because this IP is not included in this range. 43 00:04:59,688 --> 00:05:06,507 If the IP is not Private IP Address, so that IP is Public IP Address. 44 00:05:07,463 --> 00:05:25,023 Okay, the second range is 172.16.0.0 until 172.31.255.255, let’s say we have IP 172.16.10.10, 45 00:05:25,316 --> 00:05:32,665 this is Private IP Address. Why? because this IP is included in the second range. 46 00:05:33,131 --> 00:05:40,962 Another example, let’s say we have IP 172.17.100.200, 47 00:05:42,516 --> 00:05:49,026 this is also included in this range, so this is also Private IP Address. 48 00:05:49,768 --> 00:05:58,852 But If we have IP 172.35.1.10, this is not Private IP Address, 49 00:05:59,291 --> 00:06:07,666 because this IP is not included in the first range or second range. So this is Public IP Address. 50 00:06:08,556 --> 00:06:15,655 And finally, the last range for IP Private is 192.168.0.0 51 00:06:15,655 --> 00:06:28,800 until 192.168.255.255. For example we have IP 192.168.100.20, this is Private IP Address, 52 00:06:29,004 --> 00:06:33,537 Why? because this IP is included in the third range. 53 00:06:34,248 --> 00:06:45,752 Another example, let’s say we have IP 192.10.10.10, this is not Private IP Address. Why? because 54 00:06:45,752 --> 00:06:54,185 this is not included in the first, second, or third range, so this is Public IP Address. 55 00:06:55,755 --> 00:07:00,806 Okay, so remember that we have three range for Private IP Address. 56 00:07:01,901 --> 00:07:08,265 And we need to make sure that we will use one of this range in our local network. 57 00:07:08,877 --> 00:07:10,736 I think enough for this video, 58 00:07:10,736 --> 00:07:15,603 I hope you understand about Public IP Address and Private IP Address. 59 00:07:16,209 --> 00:07:19,901 Thankyou for watching and see you on the next video!