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Ans. Snapshots are point in time copies of Volume.

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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 ?

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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Q73. What is the purpose of EC2 Health check ?

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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Q74. Difference between EFS and EBS ?

Ans. Both EFS and EBS are block storage but EBS is reserved storage whereas EFS is On Demand.

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Q75. Which AWS computing service provides IAAS, PAAS , Containerization and Serverless ?

Ans. EC2 is IAAS
Elastic Beanstalk is PAAS
EKS is Containerization service
Lambda is Serverless

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Q76. What are the advantages and disadvantages of using Lambda over EC2 ?

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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Q77. Can we associate a single EFS volume with multiple EC2 instances ?

Ans. Yes

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Q78. What are the different trigger types in AWS Lambda ?

Ans. Api Gateway
Alexa
CloudFront
CloudWatch
Code Commit
Kinesis
S3
SNS

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Q79. Why AWS named the DNS service as Route 53 ?

Ans. Route is for routing which is the purpose of DNS and Default port for DNS is 53

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Q80. What happens to backups if we delete the RDS instance ?

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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Q81. Describe best practices with respect to AWS security groups ?

Ans. Configure it while creating EC2 instance only

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Q82. How would you secure EC2, Volume and Snapshots in Cloud ?

Ans. Adding more security group, it works like a firewall

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Q83. What is mounting in AWS ?

Ans. Attaching Volumes ( EBS / EFS ) on AWS Computing ( EC2, EKS )

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Q84. Can we have internal or private ELB as origin in cloudfront ?

Ans. No, it should be public as cloudfront doesn't have a way to access private ELB.

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Q85. Difference between NAT Instances and NAT Gateway

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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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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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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Q88. What is a cookie ?

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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Q89. What is servlet Chaining ?

Ans. Multiple servlets serving the request in chain.

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Q90. What are different modules of 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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Q91. What is Spring configuration file?

Ans. Spring configuration file is an XML file. This file contains the classes information and describes how these classes are configured and introduced to each other.

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Q92. Q: What is default scope of bean in Spring framework?

Ans. The default scope of bean is Singleton.

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Very Frequently asked Spring question.

Q93. What is bean auto wiring?

Ans. The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your bean by inspecting the contents of the BeanFactory without using and elements.

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Q94. What are the phases of the JSP life cycle ?

Ans. Translation of JSP PageCompilation of JSP PageClassloading (class file is loaded by the classloader)Instantiation (Object of the Generated Servlet is created).Initialization ( jspInit() method is invoked by the container).Reqeust processing ( _jspService() method is invoked by the container).Destroy ( jspDestroy() method is invoked by the container).

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Q95. What are JSP directives ? What are different types of directives ?

Ans. The jsp directives are messages that tells the web container how to translate a JSP page into the corresponding servlet.

There are three types of directives -

page directive
include directive
taglib directive

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Q96. Which markup languages can be used in restful web services ?

Rest

Ans. XML and JSON ( Javascript Object Notation ).

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Q97. Why Web services use HTTP as the communication protocol ?

Web Service

Ans. With the advent of Internet, HTTP is the most preferred way of communication. Most of the clients ( web thin client , web thick clients , mobile apps ) are designed to communicate using http only. Web Services using http makes them accessible from vast variety of client applications.

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Q98. What is the use of HTTPSession in relation to http protocol ?

Ans. http protocol on its own is stateless. So it helps in identifying the relationship between multiple stateless request as they come from a single source.

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Q99. Why using cookie to store session info is a better idea than just using session info in the request ?

Ans. Session info in the request can be intercepted and hence a vulnerability. Cookie can be read and write by respective domain only and make sure that right session information is being passed by the client.

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Q100. http protocol is by default ... ?