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- What is Cloud Computing? Name some popular cloud service providers.
Cloud Computing is the delivery of hosted services, like compute power, database storage, applications, and other IT resources, over the internet with pay-as-you-go pricing.
Some of the top cloud service providers are Amazon Web Services, Kamatera, Microsoft Azure, Google Cloud Platform, and Adobe.
- How many different models are there for cloud computing?
There are three main models for cloud computing:
- Infrastructure as a Service (IaaS)
- Platform as a Service (PaaS)
- Software as a Service (SaaS)
- What is Auto Scaling?
Auto Scaling is a service that is provided by the cloud provider, which helps in monitoring and adjusting compute resources to maintain performance for applications hosted in the cloud. It automatically discovers and tracks the performance of all the scalable resources.
- What is Hybrid Cloud?
Hybrid cloud is a cloud computing environment that combines private and public cloud, and allows data and application sharing between them. It gives business the flexibility and computing power of the public cloud, while keeping critical applications and data safe behind a company firewall.
- What does the ‘ec2-create-group CreateSecurityGroup’ command do?
The command is pretty straight forward and does what it says. It creates a new security group with the account, where the security group controls the inbound and outbound traffic.
- What is the difference between terminating and stopping an instance?
Terminating an instance means that the instance will be shut down, the virtual will be permanently taken away, and the user will no longer be charged for instance usage. Also, the data stored locally on the instance will be lost and any attached EBS volumes will be detached and deleted.Stopping is similar to terminating an instance. The key difference is that the data on the EBS (Elastic Block Store) volume will remain intact, while all the information on the local hard drive will be lost.
- What is the need to acquire costs with an EIP (Elastic Internet Protocol address)?
It is required to acquire costs with an EIP when it is associated and allocated with a stopped instance. The user is not charged when there is only one Elastic IP with the instance that the user is running. However, the user needs to pay if the IP is attached to a stopped instance.
- What is an AMI?
AMI (Amazon Machine Image) is a snapshot of the root file system that provides the information needed to launch an instance, which is a virtual server in the cloud.
- What are the parameters that you should consider while selecting the Availability Zone?
- Customer proximity, because slow connection can reduce the customer base.
- Cost, as it varies by AWS regions.
- Security and compliance: It reduces the risk of data damage.
- Service Level Agreement: To provide better service.
- What is the private and the public address?
The private address is directly associated with the instance and is sent back to EC2 when it is terminated or stopped. Whereas, public address is connected with the Instance till it is terminated or stopped.
- What are the different states available in Processor State Control?
- P-state: It controls the desired performance from a core.
- C-state: It controls the sleep levels that a core can enter when it is idle.
- What are RDS, Redshift, and DynamoDB?
- Amazon RDS (Relational Database Service): It is a fully functional alternative to common hardware databases, letting the user run a common database engine with no need for dealing with administration and maintenance.
- Amazon redshift: It is designed to work with data of up to dozens of petabytes.
- DynamoDB: It is a database service designed for the fast processing of small data.
- What is the difference between vertical and horizontal scaling in AWS?
The key difference between vertical and horizontal scaling is the way compute resources are added to the infrastructure. Horizontal scaling involves adding machines in the pool of existing resources. It comes in the picture when the users increase and vertical scaling can’t handle requests.
- How many buckets can be created by default?
Up to 100 buckets can be created in each of AWS accounts by default. In order to increase the bucket limit, one needs to submit a service limit increase.
- What is the importance of buffer in Amazon Web Services?
A buffer synchronizes different components and makes the arrangement more elastic to a burst of load or traffic across various AWS instances.