1 00:00:00,240 --> 00:00:02,969 Software-Defined Network. 2 00:00:02,969 --> 00:00:06,150 Software-Defined Networking is a revolutionary approach 3 00:00:06,150 --> 00:00:08,940 to network management that enables dynamic 4 00:00:08,940 --> 00:00:11,850 programmatically efficient network configuration 5 00:00:11,850 --> 00:00:14,910 to improve network performance and monitoring. 6 00:00:14,910 --> 00:00:18,750 SDN is designed to reduce the complexity and static 7 00:00:18,750 --> 00:00:20,970 and inflexible network architectures 8 00:00:20,970 --> 00:00:23,250 by using a standardized platform 9 00:00:23,250 --> 00:00:27,030 that provides centralized view of the entire network. 10 00:00:27,030 --> 00:00:30,000 SDN architecture decouples the network control 11 00:00:30,000 --> 00:00:33,210 and forwarding functions, enabling the network control 12 00:00:33,210 --> 00:00:35,460 to become directly programmable 13 00:00:35,460 --> 00:00:37,980 and the underlying infrastructure to be abstracted 14 00:00:37,980 --> 00:00:40,980 for applications and network services. 15 00:00:40,980 --> 00:00:44,580 This separation is achieved through three distinct planes, 16 00:00:44,580 --> 00:00:46,620 the data plane, the control plane, 17 00:00:46,620 --> 00:00:48,093 and the application plane. 18 00:00:48,930 --> 00:00:52,620 First, the data plane, also known as the forwarding plane, 19 00:00:52,620 --> 00:00:55,080 is responsible for handling packets, 20 00:00:55,080 --> 00:00:58,091 moving data packets from place to place. 21 00:00:58,091 --> 00:01:00,930 It makes decisions based on protocols 22 00:01:00,930 --> 00:01:04,110 such as IP and ethernet and is concerned 23 00:01:04,110 --> 00:01:07,530 with the actual process of sending and receiving data. 24 00:01:07,530 --> 00:01:09,900 For example, when you send an email, 25 00:01:09,900 --> 00:01:12,810 data plane of your network takes responsibility 26 00:01:12,810 --> 00:01:15,480 of moving your email data from your device 27 00:01:15,480 --> 00:01:17,370 to the recipient's device. 28 00:01:17,370 --> 00:01:19,650 It does this by forwarding the data packets 29 00:01:19,650 --> 00:01:21,960 through switches and routers. 30 00:01:21,960 --> 00:01:23,790 Next, the control plane. 31 00:01:23,790 --> 00:01:26,160 The control plane is the brain of the network. 32 00:01:26,160 --> 00:01:28,740 It makes decisions about where traffic is sent. 33 00:01:28,740 --> 00:01:30,810 In traditional network architectures, 34 00:01:30,810 --> 00:01:33,300 each router has its own control plane. 35 00:01:33,300 --> 00:01:37,170 However, in the SDN, the control plane is centralized. 36 00:01:37,170 --> 00:01:40,140 This means that one central controller dictates 37 00:01:40,140 --> 00:01:43,080 the traffic flow across the entire network 38 00:01:43,080 --> 00:01:46,560 making the network more manageable and flexible. 39 00:01:46,560 --> 00:01:48,870 Finally, application plane. 40 00:01:48,870 --> 00:01:51,780 The application plane is where all network applications 41 00:01:51,780 --> 00:01:54,990 that interact with the SDN controller reside. 42 00:01:54,990 --> 00:01:58,560 These applications instruct the controller on what to do, 43 00:01:58,560 --> 00:02:02,070 and in turn, the controller manipulates the network 44 00:02:02,070 --> 00:02:04,080 according to these instructions. 45 00:02:04,080 --> 00:02:06,690 A real world example of software defined networking 46 00:02:06,690 --> 00:02:08,699 is Google's B4 project. 47 00:02:08,699 --> 00:02:12,330 Google uses SDNs to manage its data center networks. 48 00:02:12,330 --> 00:02:15,210 The B4 project allows Google to control the flow 49 00:02:15,210 --> 00:02:16,800 of data across its network 50 00:02:16,800 --> 00:02:19,410 ensuring that bandwidth is used efficiently. 51 00:02:19,410 --> 00:02:21,480 This is particularly important for Google 52 00:02:21,480 --> 00:02:24,150 as it needs to manage a vast amount of data 53 00:02:24,150 --> 00:02:26,910 across its global network of data centers. 54 00:02:26,910 --> 00:02:30,480 Another example is AT&T'S Domain 2.0 Initiative. 55 00:02:30,480 --> 00:02:34,860 This project aims to transform AT&T's network into an SDN 56 00:02:34,860 --> 00:02:38,850 with a focus on reducing costs and increasing efficiency. 57 00:02:38,850 --> 00:02:42,450 By using SDNs, AT&T can automate many 58 00:02:42,450 --> 00:02:44,730 of its network management tasks 59 00:02:44,730 --> 00:02:47,670 reducing the need for manual intervention. 60 00:02:47,670 --> 00:02:50,100 So remember, Software-Defined Networking 61 00:02:50,100 --> 00:02:52,620 is a transformative approach to network management 62 00:02:52,620 --> 00:02:55,410 that separates the network into three distinct planes, 63 00:02:55,410 --> 00:02:58,680 the data plane, control plane, and the application plane. 64 00:02:58,680 --> 00:03:01,320 The data plane is responsible for moving data packets. 65 00:03:01,320 --> 00:03:03,810 The control plane decides where traffic is sent, 66 00:03:03,810 --> 00:03:06,930 and the application plane houses the network applications 67 00:03:06,930 --> 00:03:08,793 that instruct the controller.