Interview Questions and Answers for 'T' | Search Interview Question

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Q421. What EC2 configuration would you use if you have to use it for Bitcoin mining ?

Ans. Keeping Low cost for processing , i would choose

Spot Price Plan
F1 or P3 Instance Type
Cold Hdd (SCI ) EBS Volume

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Q422. What are the different price options available for EC2 ?

Amazon Web Services (AWS)

Ans. On Demand
Reserved
Spot
Dedicated Host

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Q423. What is the use case for "Dedicated Host" EC2 plan ?

Amazon Web Services (AWS)

Ans. If there are regulatory requirements, or proprietary license to be used.

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Q424. What is the use case for "Spot" EC2 plan ?

Amazon Web Services (AWS)

Ans. If the usage is non continuous and have flexible start and End Time. For ex - Analysis , Research , mining etc.

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Q425. What is the use case for "Reserved" EC2 plan ?

Amazon Web Services (AWS)

Ans. If the usage is continuous , stable and predictable.

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Q426. What is the use case for "On Demand" EC2 ?

Amazon Web Services (AWS)

Ans. If the computation required is Spiky and unpredictable.

If it's first time use.

If the lifespan of the application isn't known.

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Q427. What is the use case for Amazon Glacier ?

Amazon Web Services (AWS)

Ans. Amazon Glacier is used for storing archieved files / objects and hence well suited for files where retrieval time isn't that important.

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Q428. What is the use case of aws S3-IA ?

Amazon Web Services (AWS)

Ans. IA stands for infrequently accessed and hence it's suited for files / objects are expected to be accessed infrequently.

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Q429. Write a Program to find depth of node binary tree ?

Algorithm

Ans. public static int getLevel(Node root, int key) {
int levelOfNode = getLevelUtil(root, key, 1);
return levelOfNode;
}

public static int getLevelUtil(Node root, int key, int level) {
if (root == null) return 0;
if (root.data == key) return level;
int left = getLevelUtil(root.left, key, level 1);
int right = getLevelUtil(root.right, key, level 1);
if (left != 0) return left;
else return right;
}

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Q430. write a program for 4 digit otp generation?

Design

Ans. import java.util.Random;

public class OTPGenerator {
public static void main(String[] args) {
int otpLength = 4;
String otp = generateOTP(otpLength);
System.out.println("Generated OTP: " otp);
}

private static String generateOTP(int length) {
StringBuilder otp = new StringBuilder();
Random random = new Random();

for (int i = 0; i < length; i ) {
int digit = random.nextInt(10);
otp.append(digit);
}

return otp.toString();
}
}

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Q431. What could be done if we try to upload a file larger than the allowed size in S3 ?

Amazon Web Services (AWS)

Ans. We can use multi part upload API

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Q432. 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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Q433. How can we restrict CloudFront Access ?

Amazon Web Services (AWS)

Ans. Price Class
Geo Targeting
Signed Urls , Signed Cookies

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Q434. How can we restrict CloudFront access to a particular Geography ?

Amazon Web Services (AWS)

Ans. We can select the appropriate Price Class if that suits us.

We can do Geo Targeting by black listing / white listing certain geographies.

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Q435. What are the different things we can restrict CloudFront access on ?

Amazon Web Services (AWS)

Ans. 1. Protocol ( http, https )
2. Url Pattern ( *, /abc* )
3. Operation ( Put , Post , Delete etc )
4. Geo

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Q436. What is origin and distribution wrt to AWS CloudFront ?

Amazon Web Services (AWS)

Ans. Origin is the origin of File or services which CloudFront distributes like S3 in US East-1

Distribution is the combination of Edge locations that helps in the distribution of content / service.

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Q437. What is CDN ? Which AWS service is used for it ?

Amazon Web Services (AWS)

Ans. CDN is Content Delivery Network
AWS CloudFront provides CDN service

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Q438. Does S3 prices vary by region ?

Amazon Web Services (AWS)

Ans. Yes

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Q439. Which AWS service can help S3 with distribution data ?

Amazon Web Services (AWS)

Ans. AWS CloudFront

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Q440. What are the different types of encryption provided by AWS S3 ?

Amazon Web Services (AWS)

Ans. In Transit ( SSL / TSL )
At Rest Server Encryption ( SSE-S3, SSE-KMS, SSE-C )

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Q441. Can we log all S3 accesses ?

Amazon Web Services (AWS)

Ans. Yes

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Q442. Can we do Lifecycle management in S3 without versioning enabled ?

Amazon Web Services (AWS)

Ans. Yes

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Q443. How can we archieve S3 objects after certain interval ?

Amazon Web Services (AWS)

Ans. We can use S3 lifecycle management to transition older objects into AWS Glacier.

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Q444. Can we do replication to multiple regions and buckets simultaneously ?

Amazon Web Services (AWS)

Ans. No, its not allowed currently.

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Q445. Can we do replication within the same region i.e into a new bucket within same region ?

Amazon Web Services (AWS)

Ans. No. Replication is only allowed across regions. We can manually copy into other bucket though.

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Q446. Does deletion of an object gets replicated too if we have cross region replication enabled on a bucket ?

Amazon Web Services (AWS)

Ans. No, delete markers are not replicated.

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Q447. Can we do Cross Region replication in S3 without versioning ?

Amazon Web Services (AWS)

Ans. No , Both the source and destination should have versioning enabled.

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Q448. How can we protect from accidental deletes in S3 ?

Amazon Web Services (AWS)

Ans. Versioning ( will create Delete marker )
MFA Delete ( authentication upon deletion )
Cross Region Replication ( Replicates aren't deleted )

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Q449. What is a delete marker wrt to S3 objects ?

Amazon Web Services (AWS)

Ans. If the objects / bucket is versioned in S3, Any delete operation on S3 object doesn't physically deletes the object but rather creates a delete marker version. We need to delete the delete marker to physically delete it.

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Q450. If we have enabled versioning for S3 bucket, Do we need to make all new versions public whenever new versions are uploaded ?

Amazon Web Services (AWS)

Ans. Yes, all new versions are private by default even if the original file has been made public.

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