Amazon Web Services (AWS) Exam Solution.

What is Cloud Computing? - correct answer Cloud computing is the practice of using a network of remote servers to store, manage and process data, rather than a local server or personal computer. What is AWS? - correct answer AWS stands for Amazon Web Services. It is a secure cloud services platform offering compute power, database storage, content delivery and other functionality to help businesses scale and grow. What is SaaS? - correct answer SaaS stands for Software as a Service which refers to a completed software product that is run and managed by a third-party service provider. Examples include Gmail and Office 365. What is PaaS? - correct answer PaaS stands for Platform as a Service and refers to technologies that allow customers to develop, run, and manage applications without the complexity of building and maintaining an IT infrastructure. Examples includes application servers, web servers, and database systems. What is IaaS? - correct answer IaaS stands for Infrastructure as a Service and typically provide access to networking features, computers, and data storage space. Examples include processors, memory, hard drives and operating systems What is the difference between regions and availability zones in AWS? - correct answer Regions refer to areas defined by Amazon that contain 2 or more availability zones. What are some advantages of using cloud computing services such as AWS? - correct answer Scalability- Pay for what you use, gives you ability to add or remove resources as needed. Cost Effective - Eliminates cost of infrastructure maintainence, labor, resources, etc. Flexibility - Allows you to mix and match services based on changing requirements for your business. Resiliency - Reduces downtime via auto scaling and other processes What is EC2 and what can it be used for? - correct answer EC2 stands for Elastic Cloud Compute. This refers to virtual machine instances spun up in the cloud. What are two forms of storage that you can use to persist data for your EC2? - correct answer EC2 Instance Store (part of the instance) or Elastic Block Storage (virtual volume) What is an AMI? - correct answer AMI stands for Amazon Machine Image. It provides the information required to launch an EC2. What is EBS? - correct answer EBS is Elastic Block Store. It is a virtual volume attached to one EC2 instance at a time. What are the different mediums of storage that you can use for your EBS? - correct answer Solid State Drive (SSD), Hard Drive Disk (HDD), or Magnetic. What is the ELB? - correct answer The ELB is the Elastic Load Balancer. It balances the load of instances equitably behind it, making your infrastructure more resilient. What is Autoscaling? - correct answer Autoscaling is a process by which instances are deployed or shut down depending on a specific metric such as CPU usage or available memory. What is a Security Group? - correct answer A security group is a virtual firewall that provides transport layer security for your instances. All instances in AWS need to form part of a security group. What is the default Security Group for an EC2? - correct answer By default, all network traffic is denied. You must explicitly open specific ports that your system needs. Why should you not open all ports through your security group? - correct answer It makes systems that apply the security group highly vulnerable to malicious traffic, as it will allow any IP address inbound access to the system.