Interview Questions and Answers for 'Amazon' | Search Interview Question

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Q91. What are the Default metrics available for EC2 in CloudWatch ?

Amazon Web Services (AWS)

Ans. CPU, Disk, Network, Status

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Q92. Are CloudWatch metrics available with free tier ?

Amazon Web Services (AWS)

Ans. Only Basic not advanced

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Q93. 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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Q94. Difference between internal and external Load Balancer ?

Amazon Web Services (AWS)

Ans. Internal Load balancer is used for services which are for internal consumption only and hence doesn't need to direct Web traffic.

External Load balancers are for regulating web traffic.

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Q95. 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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Q96. What are the different types of AWS Load Balancers ?

Amazon Web Services (AWS)

Ans. Application , Network and Classic

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Q97. How would you securely migrate a database to RDS?

Amazon Web Services (AWS)

^{This question was recently asked at 'Cognizant (C?TS),Overstock'.This question is still unanswered. Can you please provide an answer.}

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Q98. Difference between AMI EBS based and AMI Instance Store based ?

Amazon Web Services (AWS)

^{This question is still unanswered. Can you please provide an answer.}

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Q99. Can we create AMI with encrypted snapshots ?

Amazon Web Services (AWS)

Ans. No they need to be unencrypted before an AMI is created.

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Q100. What is a Volume Snapshot ?

Amazon Web Services (AWS)

Ans. Snapshots are point in time copies of Volume.

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Q101. How can we create our own AMI ?

Amazon Web Services (AWS)

Ans. Volume -> Snapshot -> AMI

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Q102. Where are snapshots internally stored by AWS ?

Amazon Web Services (AWS)

Ans. In S3

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Q103. Can we create an AMI using volumes ?

Amazon Web Services (AWS)

Ans. Yes , We can create snapshots with Volumes and then AMIs with Snapshots.

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Q104. Can we move volumes across regions or availability zones ?

Amazon Web Services (AWS)

Ans. Yes, We can do that through snapshots and AMI

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Q105. Can we modify volume while attached EC2 is running ?

Amazon Web Services (AWS)

Ans. Yes, except Magnetic standard

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Q106. Can we have EC2 and EBS in different availability zones or regions ?

Amazon Web Services (AWS)

Ans. No, they need to be local

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Q107. Can we use magnetic storage as Root Volume ?

Amazon Web Services (AWS)

Ans. Yes , but only Magnetic standard.

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Q108. Difference between AWS Root and Additional Volume ?

Amazon Web Services (AWS)

Ans. Root Volume is the primary volume used for installing operating system whereas Additional volume is just additional disk space.

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Q109. Can we deny access for particular IP using Security Groups ?

Amazon Web Services (AWS)

Ans. No, We can do that through ACL

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Q110. Can a EC2 instance have multiple Security Groups ? Can a single security group be assigned to multiple Ec2 instances ? If either of them is true , doesn't it result in conflict ?

Amazon Web Services (AWS)

Ans. We can assign multiple security groups to single instance and we can use single security group with multiple instances.

It never results in conflict as security groups only have allow rules and no deny rules. Multiple security groups for an instance results in union of all rules.

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Q111. Can EBS Volume be encrypted ?

Amazon Web Services (AWS)

Ans. Yes but not the root volume of default AMIs.

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Q112. Which AWS service can be used to monitor EC2 ?

Amazon Web Services (AWS)

Ans. CloudWatch

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Q113. What is the difference between EC2 System status check and Instance status check ?

Amazon Web Services (AWS)

Ans. System status check is to check if the power or network is working whereas Instance status check goes further and make sure that traffic is going through.

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Q114. Can we protect EC2 instances from terminating accidentally ?

Amazon Web Services (AWS)

Ans. Yes

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Q115. Difference between EC2 instance public and private key ?

Amazon Web Services (AWS)

Ans. public key is used for locking whereas private key is used for unlocking. public key can be used for locking multiple instances and hence can be shared.

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Q116. 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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Q117. What is a volume in AWS ?

Amazon Web Services (AWS)

Ans. It's a virtual hard disk that is attached to computing.

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Q118. Does attached EBS volume get deleted if we terminate EC2 instance ?

Amazon Web Services (AWS)

Ans. By default, Root volume gets terminated whereas additional volume doesn't.

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Q119. 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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Q120. What is the name of DNS service provided by AWS ?

Amazon Web Services (AWS)

Ans. Route 53

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