WEBVTT Kind: captions Language: en 1 00:00:00.000 --> 00:00:05.002 Welcome to this free course for the AWS Certified Cloud Practitioner exam, 2 00:00:05.002 --> 00:00:10.139 CLF-C02. The exam has four domains: Cloud Concepts, Security and Compliance, 3 00:00:10.139 --> 00:00:16.763 Cloud Technology and Services, and Billing, Pricing, and Support. Security and technology together 4 00:00:16.763 --> 00:00:22.306 make up almost two-thirds of the score. We start where every cloud journey starts, 5 00:00:22.306 --> 00:00:28.997 with Domain 1, Cloud Concepts: what cloud computing is, and the six advantages AWS uses to describe 6 00:00:28.997 --> 00:00:29.797 it. 7 00:00:29.600 --> 00:00:34.997 Throughout this course, we'll follow one example: a small online store. 8 00:00:34.997 --> 00:00:42.142 Before the cloud, the store runs its website on its own servers. That means buying hardware up 9 00:00:42.142 --> 00:00:47.842 front, waiting weeks for it to arrive, paying for power, cooling and space, 10 00:00:47.842 --> 00:00:54.227 and guessing how much capacity the busiest day of the year will need. Guess too low, 11 00:00:54.227 --> 00:00:59.700 and the site slows down. Guess too high, and expensive servers sit idle. 12 00:01:00.100 --> 00:01:07.409 Cloud computing changes that model. AWS defines it as the on-demand delivery of IT resources over 13 00:01:07.409 --> 00:01:13.135 the internet with pay-as-you-go pricing. Three ideas matter here. On demand: 14 00:01:13.135 --> 00:01:19.087 you get resources such as compute, storage and databases when you ask for them, 15 00:01:19.087 --> 00:01:25.040 in minutes. Over the internet: you reach them from anywhere. And pay as you go: 16 00:01:25.040 --> 00:01:27.300 you pay only for what you use. 17 00:01:27.700 --> 00:01:33.562 AWS groups the benefits into six advantages, and exam questions use this wording, 18 00:01:33.562 --> 00:01:39.352 so it's worth learning. Advantage one: trade fixed expense for variable expense. 19 00:01:39.352 --> 00:01:46.155 On premises, the store pays a large amount up front for servers before it knows how they'll be 20 00:01:46.155 --> 00:01:52.380 used. That's a capital expense. In the cloud, it pays only when it consumes resources, 21 00:01:52.380 --> 00:01:59.400 and only for how much it consumes. Spending becomes a variable expense that follows the business. 22 00:01:59.800 --> 00:02:06.671 Advantage two: benefit from massive economies of scale. AWS combines the usage of hundreds of 23 00:02:06.671 --> 00:02:13.763 thousands of customers. Buying and running infrastructure at that scale costs less per unit than 24 00:02:13.763 --> 00:02:20.412 a single company could manage on its own, which lets AWS offer lower pay-as-you-go prices. 25 00:02:20.412 --> 00:02:27.357 On the exam, when a question links lower prices to the size of AWS, the answer is economies of 26 00:02:27.357 --> 00:02:28.157 scale. 27 00:02:28.200 --> 00:02:34.604 Advantage three: stop guessing capacity. Here's the store's traffic over a year, 28 00:02:34.604 --> 00:02:42.049 with a big spike during holiday sales. On premises, it has to pick a fixed amount of capacity 29 00:02:42.049 --> 00:02:49.494 in advance. For most of the year, much of that capacity sits idle, and the store has paid for 30 00:02:49.494 --> 00:02:57.180 it anyway. Then, at the peak, demand climbs above what it bought, and customers get a slow site, 31 00:02:57.180 --> 00:02:57.980 or leave. 32 00:02:58.300 --> 00:03:05.530 In the cloud, capacity can follow demand. The store adds servers as traffic grows and removes 33 00:03:05.530 --> 00:03:13.227 them as it falls, often automatically. This ability to scale out and scale in with demand is called 34 00:03:13.227 --> 00:03:20.613 elasticity. You use as much or as little capacity as you need, with only a few minutes' notice, 35 00:03:20.613 --> 00:03:25.900 so you stop paying for idle servers and stop turning customers away. 36 00:03:26.300 --> 00:03:33.117 Advantage four: increase speed and agility. On premises, getting a new server means ordering, 37 00:03:33.117 --> 00:03:38.468 shipping, racking and configuring it, which can take weeks. In the cloud, 38 00:03:38.468 --> 00:03:45.431 new resources are a few clicks or one API call away, ready in minutes. Because trying something 39 00:03:45.431 --> 00:03:51.221 new is fast and cheap, teams can experiment: launch a test, measure the result, 40 00:03:51.221 --> 00:03:54.300 then keep it or delete it. That's agility. 41 00:03:54.700 --> 00:03:59.458 Advantage five: stop spending money running and maintaining data centers. 42 00:03:59.458 --> 00:04:05.650 Racking and stacking servers, powering and cooling them, replacing failed hardware and guarding 43 00:04:05.650 --> 00:04:11.777 the buildings: AWS handles that heavy lifting. Your team can focus on what makes your business 44 00:04:11.777 --> 00:04:17.904 different, such as your customers, your product and new features. You're still responsible for 45 00:04:17.904 --> 00:04:23.900 securing what you build in the cloud, which we'll cover in the shared responsibility lesson. 46 00:04:24.300 --> 00:04:30.781 Advantage six: go global in minutes. AWS has Regions around the world. With a few clicks, 47 00:04:30.781 --> 00:04:37.044 the store can deploy its application in Regions close to customers in Europe and Asia. 48 00:04:37.044 --> 00:04:42.942 Shorter distances mean lower latency and a better experience for those customers, 49 00:04:42.942 --> 00:04:49.860 at minimal cost. Building your own data center on another continent would take months or years. 50 00:04:49.860 --> 00:04:52.700 In the cloud, it's a deployment choice. 51 00:04:53.100 --> 00:04:59.833 Here's how the exam tests this. A question describes a situation, and you match it to an advantage. 52 00:04:59.833 --> 00:05:04.865 No large up-front investment points to trading fixed for variable expense. 53 00:05:04.865 --> 00:05:11.190 Lower prices because of the size of AWS means economies of scale. Unpredictable traffic means 54 00:05:11.190 --> 00:05:16.019 stop guessing capacity. Fast, cheap experiments mean speed and agility. 55 00:05:16.019 --> 00:05:20.983 Focusing on customers instead of servers means stop running data centers. 56 00:05:20.983 --> 00:05:25.200 And reaching new countries quickly means go global in minutes. 57 00:05:25.600 --> 00:05:31.300 Let's recap. Cloud computing is the on-demand delivery of IT resources over the internet, 58 00:05:31.300 --> 00:05:37.256 with pay-as-you-go pricing. Its six advantages are: trade fixed expense for variable expense, 59 00:05:37.256 --> 00:05:43.148 benefit from massive economies of scale, stop guessing capacity, increase speed and agility, 60 00:05:43.148 --> 00:05:48.463 stop spending money running and maintaining data centers, and go global in minutes. 61 00:05:48.463 --> 00:05:54.547 Next, we'll look at the different ways cloud services are delivered, from raw infrastructure to 62 00:05:54.547 --> 00:05:55.700 finished software.