Amazon Web Services (AWS) - Interview Questions and Answers for 'Amazon ec2' | Search Interview Question

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Q31. Difference between EC2 instance public and private key ?

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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Q32. Can we protect EC2 instances from terminating accidentally ?

Amazon Web Services (AWS)

Ans. Yes

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Q33. 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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Q34. Which AWS service can be used to monitor EC2 ?

Amazon Web Services (AWS)

Ans. CloudWatch

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Q35. 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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Q36. Can we modify volume while attached EC2 is running ?

Amazon Web Services (AWS)

Ans. Yes, except Magnetic standard

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Q37. Are you using Auto Scaling for your EC2 instances ? How have you configured Auto scaling policy ?

Amazon Web Services (AWS)

Ans. yes, you can create auto scaling policy to set max and min no of instance.

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Q38. Can we associate a single EBS volume with multiple EC2 instances ?

Amazon Web Services (AWS)

Ans. No

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Q39. Can we attach single volume to multiple Ec2 instances ?

Amazon Web Services (AWS)

Ans. Yes EFS volumes but not EBS

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Q40. What is the use case of AWS Placement Group ?

Amazon Web Services (AWS)

Ans. Computing that would require high network throughput and low latency within a single availability zone.

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Q41. Can you explain what are NAT instances and what are they used for ?

Amazon Web Services (AWS)

Ans. If instances in private subnet need to access internet without exposing the IP address to outside world , we use Nat gateway or nat instance. So there is a direct outbound traffic but not direct inbound traffic.

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Q42. Difference between EC2 and S3 ?

Amazon Web Services (AWS)

Ans. Ec2 is a computing service whereas S3 is a object based storage.

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Q43. What is the limit for Ec2 SSH sessions ?

Amazon Web Services (AWS)

Ans. Max sessions limit is defined in sshd_config. Default is set to 10 but can be overridden.

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