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| Ans. Its a storage option provided by AWS which is even cheaper than S3. As the objects are archieved before saving, retrieval time is pretty bad. | ||||
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 Discuss Correct / Improve  aws glacier | ||||
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| Ans. It's an on premise virtual appliance that can be used as cache to store s3 locally at customer site. | ||||
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| Discuss Correct / Improve aws storage gateway | ||||
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| Ans. You cannot reserve the time slot and they can be made to use whenever they are available. AWS can Terminate the EC2 instance on their own even if it's in use. | ||||
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| Discuss Correct / Improve aws ec2 aws computing amazon cloud computing amazon ec2 aws ec2 aws computing amazon cloud computing amazon ec2 spot | ||||
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| Ans. AWS Cached - Low Availability than AWS Stored, Lower cost than AWS Stored AWS Stored - High Availability, High Local Storage Cost AWS VTL - S3 Used as Back up only. | ||||
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| Discuss Correct / Improve aws gateway aws gateway cached aws gateway stored aws gateway vtl | ||||
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| Ans. Service ( EC2, Lambda etc ) AMI ( Operating System and Softwares ) Instance Type ( T,M, R etc ) EBS ( Volume Type , Size ) Price Class ( OnDemand, Dedicated etc ) | ||||
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| Discuss Correct / Improve aws computing | ||||
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| Ans. AWS console >> security groups >> Create security group >> Configure security group bases on Network requirement of EC2 instance | ||||
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| Discuss Correct / Improve aws security group | ||||
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| Ans. Snapshots are point in time copies of Volume. | ||||
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| Discuss Correct / Improve aws ebs aws ebs volume | ||||
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| Ans. Application Load Balancer is high level ( Level 7 Networking Layer ) and provides better features and flexibility than Network Load Balancer ( Level 4 Network Layer ) Network Load Balancer is turn provides better performance as it regulates raw traffic. | ||||
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| Discuss Correct / Improve aws elb amazon elb | ||||
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| Ans. We can use this check for variety of things - 1. Monitoring the status / Alarms in case it's down 2. Regulating traffic to healthy instances only through Load Balancer | ||||
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| Discuss Correct / Improve aws ec2 aws computing amazon cloud computing amazon ec2 | ||||
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| Ans. JVM - With Cloud and Serverless, this could be a hurdle for it to be preferred technology. Confusion between OOP and Functional Programming. Slower speed of innovation due to wider adoption. | ||||
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| Ans. Base Class is a relative term used to signify the Parent class in Parent - Child or Base - derived relationship. Derived Class is a relative term used to signify the Child class in Parent - Child or Base - derived relationship. Abstract Class is a class that is not allowed to be instantiated and hence can serve only a base class for it's usage. Concrete Class is the class which is supposed to be instantiated and hence provide definition for all implementing interface methods and extending abstract methods. | ||||
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| Discuss Correct / Improve Base Class Derived Class Abstract Class Concrete Class | ||||
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| Ans. Both EFS and EBS are block storage but EBS is reserved storage whereas EFS is On Demand. | ||||
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| Discuss Correct / Improve aws ebs aws efs | ||||
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| Ans. EC2 is IAAS Elastic Beanstalk is PAAS EKS is Containerization service Lambda is Serverless | ||||
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| Discuss Correct / Improve IAAS PAAS Containerization Serverless | ||||
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| Ans. Advantages - Much Cheaper Continuous scaling Higher level and Serverless Disadvantages - Warm up time Limited flexibility in terms of technologies Limited control | ||||
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| Discuss Correct / Improve aws lambda aws serverless computing amazon cloud serverless computing amazon lambda aws ec2 aws computing amazon cloud computing amazon ec2 | ||||
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| Ans. Yes | ||||
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| Discuss Correct / Improve aws efs volume aws ec2 aws computing amazon cloud computing amazon ec2 | ||||
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| Ans. Api Gateway Alexa CloudFront CloudWatch Code Commit Kinesis S3 SNS | ||||
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| Discuss Correct / Improve aws lambda aws serverless computing amazon cloud serverless computing amazon lambda trigger | ||||
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| Ans. Route is for routing which is the purpose of DNS and Default port for DNS is 53 | ||||
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| Discuss Correct / Improve aws route53 | ||||
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| Ans. Automated Backups are deleted automatically whereas Snapshots are preserved. Upon terminating RDS instance , AWS gives a warning about that and requests to create a final snapshot before terminating the instance. | ||||
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| Discuss Correct / Improve aws rds aws database amazon cloud database | ||||
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| Ans. Configure it while creating EC2 instance only | ||||
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Discuss Correct / Improve aws security groups  Asked in 1 Companies | ||||
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| Ans. Adding more security group, it works like a firewall | ||||
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| Discuss Correct / Improve aws ec2 aws computing amazon cloud computing amazon ec2 aws ebs volume snapshot Asked in 1 Companies | ||||
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| Ans. Attaching Volumes ( EBS / EFS ) on AWS Computing ( EC2, EKS ) | ||||
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| Discuss Correct / Improve aws ebs aws efs aws ec2 aws computing amazon cloud computing amazon ec2 aws eks | ||||
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| Ans. No, it should be public as cloudfront doesn't have a way to access private ELB. | ||||
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| Discuss Correct / Improve aws elb amazon elb aws cloudfront amazon cloudfront | ||||
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| Ans. High bandwidth and availability in NAT Gateway NAT Gateway is completely managed by AWS NAT Gateway is auto scalable NAT Instance is just like EC2 instance and hence backed by security group NAT Instance can be used as bastion host whereas NAT Gateway cannot be. | ||||
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| Discuss Correct / Improve aws nat instance aws nat gateway | ||||
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| Ans. Deserialization. In serialization, we can save the object of a byte stream into a file or send over a network. Suppose if you serialize the Singleton class, and then again de-serialize that object, it will create a new instance, hence deserialization will break the Singleton pattern. To overcome this issue, we need to override readResolve() method in the Singleton class and return the same Singleton instance. | ||||
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| Discuss Correct / Improve singleton design patterns Asked in 1 Companies | ||||
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| Ans. As String is immutable so by maintaining pool area we can refer the object to same area if they are with same content. But when it comes to string buffer or builder then due to mutable property if we do so then all the objects referring to that area will from now has new content.. So as to avoid this pool is present only in string. | ||||
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| Discuss Correct / Improve Asked in 1 Companies | ||||
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| This question was recently asked at 'oodles technology'.This question is still unanswered. Can you please provide an answer. | ||||
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| Ans. IP Authentication IP Range Authentication Certificates Authentication Cards | ||||
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| Ans. A List is an child interface of collection interface in java where as Linked list is and implementation class of List interface which has doubly linked as a underlying data structure | ||||
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| Discuss Correct / Improve linkedlist list vs linkedlist Asked in 1 Companies | ||||
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| Ans. Using ./ | ||||
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| Discuss Correct / Improve Asked in 1 Companies | ||||
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| Ans. I would choose Eager as the cost for 1 additional object is too minute for any such consideration. Eager Loading results in Faster access ( Object available at load time) at the cost of additional space. Lazy loading results in space saving ( Object available at first use ) at the cost of access speed. | ||||
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| Discuss Correct / Improve design Pattern Singleton Lazy vs Eager Loading | ||||
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