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 Q61. Can you explain the integration between API Gateway and Lambda if we wish to develop services using these tools.Amazon Web Services (AWS)
Ans. We can create API gateway and give the name of lambda function in order to be linked with lambda function, deploy the API and whenever request will be made from API it will directly be linked to lambda function to perform further process.

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   Like         Discuss         Correct / Improve     aws api gateway  aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda

 Q62. Describe structure of a Web application.architecture
Ans. WEB APP |WEB-INF - META-INF | | | META-INF.MF | lib - WEB.xml - Classes

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   Like         Discuss         Correct / Improve     web application     Asked in 3 Companies      intermediate        frequent

  Q63. What are the types of authentication used in Web services ?Web Service
Ans. Encrypted User Name / Password
Encrypted Password within Cookie
Encrypted Tokens
IP
Client Certificates
Oauth

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   Like         Discuss         Correct / Improve     authentication  security  web service     Asked in 12 Companies      basic        frequent

 Q64. What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?Amazon Web Services (AWS)
Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.

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   Like         Discuss         Correct / Improve     aws s3  aws storage  amazon cloud storage  amazon s3  aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda

 Q65. What is the use of Amazon Glacier?Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws glacier

 Q66. What is AWS Storage Gateway?Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws storage gateway

 Q67. What are the drawbacks of using Spot EC2 instances ?Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2  aws ec2  aws computing  amazon cloud computing  amazon ec2 spot

 Q68. What is the use case for AWS Gateway cached , stored and VTL ? Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws gateway  aws gateway cached  aws gateway stored  aws gateway vtl

 Q69. What are the things to consider while provisioning computing in AWS ?Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws computing

 Q70. How have you configured Security Groups ?Amazon Web Services (AWS)
Ans. AWS console >> security groups >> Create security group >> Configure security group bases on Network requirement of EC2 instance

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 Q71. What is a Volume Snapshot ?Amazon Web Services (AWS)
Ans. Snapshots are point in time copies of Volume.

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   Like         Discuss         Correct / Improve     aws ebs  aws ebs volume

 Q72. Which of the Load balancer - Application / Network provides advanced features ? What is the use of other Load Balancer than if one provides advanced feature than other ?Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws elb  amazon elb

 Q73. What is the purpose of EC2 Health check ?Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q74. Difference between EFS and EBS ?Amazon Web Services (AWS)
Ans. Both EFS and EBS are block storage but EBS is reserved storage whereas EFS is On Demand.

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   Like         Discuss         Correct / Improve     aws ebs  aws efs

 Q75. Which AWS computing service provides IAAS, PAAS , Containerization and Serverless ?Amazon Web Services (AWS)
Ans. EC2 is IAAS
Elastic Beanstalk is PAAS
EKS is Containerization service
Lambda is Serverless

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   Like         Discuss         Correct / Improve     IAAS   PAAS    Containerization  Serverless

 Q76. What are the advantages and disadvantages of using Lambda over EC2 ?Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda  aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q77. Can we associate a single EFS volume with multiple EC2 instances ?Amazon Web Services (AWS)
Ans. Yes

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   Like         Discuss         Correct / Improve     aws efs volume  aws ec2  aws computing  amazon cloud computing  amazon ec2

 Q78. What are the different trigger types in AWS Lambda ?Amazon Web Services (AWS)
Ans. Api Gateway
Alexa
CloudFront
CloudWatch
Code Commit
Kinesis
S3
SNS

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   Like         Discuss         Correct / Improve     aws lambda  aws serverless computing  amazon cloud serverless computing  amazon lambda trigger

 Q79. Why AWS named the DNS service as Route 53 ?Amazon Web Services (AWS)
Ans. Route is for routing which is the purpose of DNS and Default port for DNS is 53

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   Like         Discuss         Correct / Improve     aws route53

 Q80. What happens to backups if we delete the RDS instance ?Amazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws rds  aws database  amazon cloud database

 Q81. Describe best practices with respect to AWS security groups ?Amazon Web Services (AWS)
Ans. Configure it while creating EC2 instance only

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   Like         Discuss         Correct / Improve     aws security groups     Asked in 1 Companies

 Q82. How would you secure EC2, Volume and Snapshots in Cloud ? Amazon Web Services (AWS)
Ans. Adding more security group, it works like a firewall

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   Like         Discuss         Correct / Improve     aws ec2  aws computing  amazon cloud computing  amazon ec2  aws ebs volume snapshot     Asked in 1 Companies

 Q83. What is mounting in AWS ?Amazon Web Services (AWS)
Ans. Attaching Volumes ( EBS / EFS ) on AWS Computing ( EC2, EKS )

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   Like         Discuss         Correct / Improve     aws ebs  aws efs  aws ec2  aws computing  amazon cloud computing  amazon ec2  aws eks

 Q84. Can we have internal or private ELB as origin in cloudfront ?Amazon Web Services (AWS)
Ans. No, it should be public as cloudfront doesn't have a way to access private ELB.

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   Like         Discuss         Correct / Improve     aws elb  amazon elb  aws cloudfront  amazon cloudfront

 Q85. Difference between NAT Instances and NAT GatewayAmazon Web Services (AWS)
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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   Like         Discuss         Correct / Improve     aws nat instance  aws nat gateway

 Q86. Why would a cloud customer use resources in multiple regions and zones ?Cloud Computing
Ans. 1. Fault Tolerance
2. Better Access by bringing the application closer to the users.

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   Like         Discuss         Correct / Improve     Google Cloud Computing (GCP)  Amazon Web Services (AWS)  Availability Zones  Regions and Zones  Infrastructure

 Q87. What are system integrators in Cloud Computing?Cloud Computing
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Amazon Web Services (AWS)   Google Cloud Platform (GCP)

  Q88. What is a cookie ?Java EE
Ans. A cookie is a small piece of text stored on a user's computer by the browser for a specific domain. Commonly used for authentication, storing site preferences, and server session identification.

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   Like         Discuss         Correct / Improve     cookie   javascript   web application   session management   browser   j2ee     Asked in 16 Companies      basic        frequent

 Q89. What is servlet Chaining ?Java EE
Ans. Multiple servlets serving the request in chain.

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   Like         Discuss         Correct / Improve     java   web application   servlets     Asked in 1 Companies        rare

 Q90. What are different modules of spring ?
Spring
Ans. There are seven core modules in spring

Spring MVC
The Core container
O/R mapping
DAO
Application context
Aspect Oriented Programming or AOP
Web module

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   Like         Discuss         Correct / Improve     j2ee   spring   mvc   frameworks   web applications

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