1 00:00:00,708 --> 00:00:06,190 In the previous video we already learn about the concept of block subnet. 2 00:00:06,674 --> 00:00:11,776 Next in this video, we are going to learn about networking devices. 3 00:00:12,641 --> 00:00:18,389 In the computer network, we will need some device to build a computer network it self. 4 00:00:18,847 --> 00:00:24,221 The main devices that we need to build a computer network is switch and router. 5 00:00:25,048 --> 00:00:32,103 Actually there are many other devices that we will need in computer network, like firewall, 6 00:00:32,103 --> 00:00:35,900 access point, wirelss controller, and others. 7 00:00:36,765 --> 00:00:43,610 But in this course, we will learn about this two first, which is switch and router. 8 00:00:44,628 --> 00:00:50,191 Switch is used to connecting many computer that is in the same block subnet. 9 00:00:50,675 --> 00:00:56,926 And router is used to connecting many computer that is in the different block subnet. 10 00:00:57,880 --> 00:01:04,040 If you remember in the previous video, I show you that if 2 pc in the different block subnet, 11 00:01:04,040 --> 00:01:07,556 that 2 pc can not communicate each others. 12 00:01:08,154 --> 00:01:18,248 So here if here we have 2 pc, the ip address of pc 1 is 10.10.10.10/27, and the ip address 13 00:01:18,248 --> 00:01:22,644 of pc 2 is 10.10.10.60. 14 00:01:23,089 --> 00:01:26,926 Here we can see that pc 1 is in the first block subnet. 15 00:01:27,244 --> 00:01:30,223 And pc 2 is in the second block subnet. 16 00:01:30,757 --> 00:01:34,826 In this case, pc 1 can not communicate with pc 2. 17 00:01:35,386 --> 00:01:43,162 But if the ip address of pc 2 also in the first block subnet, let’s say 20, this two pc 18 00:01:43,162 --> 00:01:46,125 will able to communicate each others. 19 00:01:47,155 --> 00:01:50,287 Okay, now let’s learn more about switch. 20 00:01:50,758 --> 00:01:57,000 Remember that switch is used to connecting many pc that is in the same block subnet. 21 00:01:57,814 --> 00:02:05,521 In the previous case, we only have 2 pc, but how if we also have pc 3 and pc 4, 22 00:02:07,010 --> 00:02:09,433 how if we have 100 pc? 23 00:02:09,992 --> 00:02:12,377 This is why we need a switch. 24 00:02:13,026 --> 00:02:19,724 So here we can put a switch, and then all of computer can connect to the switch. 25 00:02:20,258 --> 00:02:22,628 How many computer can connect to the switch? 26 00:02:23,150 --> 00:02:30,332 This is based on the port in the switch, some switch have 24 port, and some other switch 27 00:02:30,332 --> 00:02:32,219 have 48 port. 28 00:02:33,123 --> 00:02:38,729 All of this pc that connected to the same switch, must be in the same block subnet, 29 00:02:39,429 --> 00:02:43,086 so all of pc can communicate each others. 30 00:02:43,684 --> 00:02:51,569 Let’s say we use ip address 10.10.10.x, the x will be replaced for each computer. 31 00:02:52,154 --> 00:03:09,913 Let’s say for pc 1 the ip address is 10.10.10.2, pc 2 10.10.10.3, pc 3 10.10.10.4, pc 4 10.10.10.5, 32 00:03:10,231 --> 00:03:15,643 and let’s say here we use ip address 10.10.10.50. 33 00:03:16,610 --> 00:03:23,002 In this case, pc 1 until pc 4 will able to communicate each others. 34 00:03:23,485 --> 00:03:28,746 But pc 5 can not communicate with pc 1 until pc 4. 35 00:03:29,612 --> 00:03:30,383 Why? 36 00:03:30,548 --> 00:03:37,530 Because pc 1 until pc 4 is in the same block subnet, which is first block subnet. 37 00:03:37,963 --> 00:03:44,124 But pc 5 is in the different block subnet, which is second block subnet. 38 00:03:45,000 --> 00:03:52,000 Okay, so that is the function of switch, which is connecting many computer that in the same 39 00:03:52,000 --> 00:03:53,222 block subnet. 40 00:03:54,062 --> 00:04:01,010 Now let’s learn about router, router is used to connecting many pc in the different 41 00:04:01,010 --> 00:04:02,243 block subnet. 42 00:04:03,121 --> 00:04:09,637 Now let’s change this first, let’s say we will use 10, and here let’s say we will 43 00:04:09,637 --> 00:04:12,525 use 20 and 25. 44 00:04:13,569 --> 00:04:18,790 Okay so all of this pc is in the first block subnet. 45 00:04:20,368 --> 00:04:26,856 Let’s say this is room number 1, now let’s draw for room number 2. 46 00:04:27,479 --> 00:04:32,801 Here we also have a switch and have some pc that connected to the switch. 47 00:04:33,539 --> 00:04:38,639 For all pc in the room number 2, we will use second block subnet. 48 00:04:39,403 --> 00:04:47,867 Here we use 10.10.10.35, remember that 35 is in the second block subnet. 49 00:04:48,363 --> 00:04:57,000 And here we use 40, 41, 42,43, and let’s say 50. 50 00:04:57,891 --> 00:05:04,514 Here all pc in the room number 1 will be able to communicate each others, and all pc in 51 00:05:04,514 --> 00:05:09,077 the room number 2 will also able to communicate each others. 52 00:05:09,714 --> 00:05:14,089 But the question is, how to communicate with different room? 53 00:05:14,356 --> 00:05:20,436 Let’ say we want to communicate between pc in the room 1 and room 2. 54 00:05:21,098 --> 00:05:23,741 To do this, we will need a router. 55 00:05:24,543 --> 00:05:27,168 Okay so here I draw a router. 56 00:05:27,576 --> 00:05:33,356 And we need to connecting switch in the room number 1 to the router, also switch in the 57 00:05:33,356 --> 00:05:35,623 room number 2 to the router. 58 00:05:36,704 --> 00:05:43,029 Okay, now all pc in the room number 1 will able to communicate with all pc in the room 59 00:05:43,029 --> 00:05:44,137 number 2. 60 00:05:44,887 --> 00:05:50,914 The summary is that switch is used to connecting many pc in the same block subnet, 61 00:05:51,245 --> 00:05:56,356 while router is used to connecting many pc in the different block subnet. 62 00:05:57,553 --> 00:06:03,320 I think enough for this video, I hope you now understand the function of switch and 63 00:06:03,320 --> 00:06:03,926 router. 64 00:06:04,588 --> 00:06:11,133 In the next video we are going to practice about switch and router in cisco packet tracer. 65 00:06:11,858 --> 00:06:15,453 Thankyou for watching and see you on the next video!