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NEW QUESTION: 1
A customer enquires about whether all his data is secure on AWS and is especially concerned about
Elastic Map Reduce (EMR) so you need to inform him of some of the security features in place for AWS.
Which of the below statements would be an incorrect response to your customers enquiry?
A. Amazon EMR customers can choose to send data to Amazon S3 using the HTTPS protocol for secure transmission.
B. Every packet sent in the AWS network uses Internet Protocol Security (IPsec).
C. Customers may encrypt the input data before they upload it to Amazon S3.
D. Amazon S3 provides authentication mechanisms to ensure that stored data is secured against unauthorized access.
Answer: B
Explanation:
Amazon S3 provides authentication mechanisms to ensure that stored data is secured against unauthorized access. Unless the customer who is uploading the data specifies otherwise, only that customer can access the data. Amazon EMR customers can also choose to send data to Amazon S3 using the HTTPS protocol for secure transmission. In addition, Amazon EMR always uses HTTPS to send data between Amazon S3 and Amazon EC2. For added security, customers may encrypt the input data before they upload it to Amazon S3 (using any common data compression tool); they then need to add a decryption step to the beginning of their cluster when Amazon EMR fetches the data from Amazon S3.
Reference: https://aws.amazon.com/elasticmapreduce/faqs/

NEW QUESTION: 2
회사는 스트리밍 시장 데이터를 수집하고 처리합니다. 데이터 속도는 일정합니다. 집계 통계를 계산하는 야간 프로세스가 실행되며 각 실행을 완료하는 데 약 4 시간이 걸립니다. 통계 분석은 비즈니스에 미션 크리티컬하지 않으며 특정 실행에 실패한 경우 다음 실행에서 이전 데이터 포인트가 선택됩니다.
현재 아키텍처는 풀 타임으로 1 년 예약이 실행되는 Amazon EC2 예약 인스턴스 풀을 사용하여 연결된 Amazon EBS 볼륨에 스트리밍 데이터를 수집하고 저장합니다. 온 디맨드 EC2 인스턴스는 매일 밤 실행되어 야간 처리를 수행하고 수집 서버의 NFS 공유에서 저장된 데이터에 액세스하고 완료되면 야간 처리 서버를 종료합니다. 예약 인스턴스 예약이 만료되고 회사는 새로운 예약을 구매할지 또는 새로운 디자인을 구현할지를 결정해야 합니다.
가장 비용 효율적인 디자인은 무엇입니까?
A. Amazon Kinesis Data Firehose를 사용하여 Amazon S3에 데이터를 저장하도록 수집 프로세스를 업데이트 하십시오. 매일 밤 시작하여 S3 데이터의 일괄 처리를 수행하고 처리가 완료되면 종료되는 온 디맨드 EC2 인스턴스를 사용하십시오.
B. 3 년 임대로 Network Load Balancer 뒤에서 EC2 예약 인스턴스를 사용하도록 수집 프로세스를 업데이트하십시오. 야간 처리를 위해 온 디맨드 가격의 최대 입찰가가 50 % 인 스팟 인스턴스와 함께 배치를 사용하십시오.
C. Amazon Kinesis Data Firehouse를 사용하여 Amazon S3에 데이터를 저장하도록 수집 프로세스를 업데이트하십시오. AWS Batch를 사용하면 온 디맨드 가격의 50 %의 스팟 시장 입찰가로 야간 처리를 수행 할 수 있습니다.
D. Amazon Kinesis Data Firehose를 사용하여 Amazon Redshift에 데이터를 저장하도록 수집 프로세스를 업데이트하십시오.
Amazon CloudWatch Events에서 매일 밤 실행되도록 예약 된 AWS Lambda 함수를 사용하여 Amazon Redshift를 쿼리하여 일일 통계를 생성하십시오.
Answer: C
Explanation:
Explanation
https://www.simform.com/aws-lambda-vs-ec2/
https://aws.amazon.com/about-aws/whats-new/2018/10/aws-lambda-supports-functions-that-can-run-up-to-15-m
https://aws.amazon.com/batch/faqs/?nc=sn&loc=5

NEW QUESTION: 3
Which operation causes an index to be considered "used" while monitoring is turned on for that particular index?
A. only when the index is specified in a hint
B. when a statement is executed and the execution plan contains a reference to the index
C. when a statement is parsed and the resulting execution plan contains a reference to the index
D. when data is fetched by an execution plan that uses that index
Answer: C