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TopexamはIT認定試験に関連する資料の専門の提供者として、受験生の皆さんに最も優秀な試験SOA-C03参考書を提供することを目標としています。他のサイトと比較して、Topexamは皆さんにもっと信頼されています。なぜでしょうか。それはTopexamは長年の経験を持っていて、ずっとIT認定試験の研究に取り組んでいて、試験についての多くの規則を総括しましたから。そうすると、TopexamのSOA-C03教材は高い的中率を持つことができます。これはまた試験の合格率を保証します。従って、Topexamは皆の信頼を得ました。
質問 # 118
A company is preparing for a marketing campaign that will increase traffic to a new web application. The application uses Amazon API Gateway and AWS Lambda for the application logic. The application stores relevant user data in an Amazon Aurora MySQL DB cluster that has one Aurora Replica. Database queries for the application are 5% write and 95% read.
What should a CloudOps engineer do to scale the database when traffic increases?
正解：A
解説：
Because the application workload is 95% reads, the best database scaling approach is to add or remove Aurora Replicas. Aurora Auto Scaling can automatically adjust the number of Aurora Replicas in a DB cluster based on metrics such as average CPU utilization or average connections across replicas. This allows the read tier to scale as campaign traffic increases while the primary writer continues to handle the smaller write workload.
Option B is incorrect because Aurora Auto Scaling scales the number of replicas; it does not vertically resize existing replicas. Options C and D are worded around generic AWS Auto Scaling rather than Aurora Auto Scaling and use less appropriate metric relationships. Scaling based on replica CPU utilization directly addresses read pressure. Therefore, configure Aurora Auto Scaling for Aurora Replicas.
質問 # 119
A company runs a workload on a high performance computing (HPC) cluster on AWS. The workload is Linux-based and uses three Amazon EC2 instances. Each EC2 instance has a 10 TiB Throughput Optimized HDD (st1) Amazon EBS volume. A CloudOps engineer determines that the current storage is not meeting the workload's performance needs. The workload needs a durable file store that has throughput of 100,000 IOPS.
Which solution will meet these requirements?
正解：A
解説：
Amazon FSx for Lustre is designed for high-performance computing workloads that need a shared, durable, high-throughput file system. It supports Linux clients and is purpose-built for workloads such as machine learning, analytics, media processing, and HPC. The current use of separate st1 EBS volumes is not meeting performance needs and also does not provide a shared high-performance file system across the cluster.
ElastiCache is an in-memory cache, not a durable POSIX-style HPC file store. Amazon S3 is durable object storage, but it is not a high-performance shared file system for Linux HPC applications that expect file-system semantics. S3 Transfer Acceleration improves long-distance data transfer to S3 but does not solve local HPC file I/O. Therefore, FSx for Lustre is the correct performance optimization choice.
質問 # 120
A company has an application that uses Amazon ElastiCache for Memcached to cache query responses to improve latency.
However, the application's users are reporting slow response times. A SysOps administrator notices that the Amazon CloudWatch metrics for Memcached evictions are high.
Which actions should the SysOps administrator take to fix this issue? (Choose two.)
正解：A、E
質問 # 121
A company runs a critical application by using Amazon DynamoDB. During a recent deployment, the application accidentally wrote incorrect data to a DynamoDB table. The table has point-in-time recovery (PITR) enabled with continuous backups. DynamoDB Streams is enabled on the table.
The company's recovery point objective (RPO) is 2 minutes.
A CloudOps engineer must restore the table to its state from 2 minutes before the corruption occurred.
Which solution will meet these requirements?
正解：D
解説：
DynamoDB point-in-time recovery continuously backs up table data and can restore the table to a selected second within the recovery window. AWS documentation states that a PITR restore restores the data to a new table, not in place on the existing table. Therefore, the correct process is to restore the table to the timestamp two minutes before the corruption and then update the application to use the newly restored table. Option A is wrong because PITR does not update the existing table in place. Option C uses an on-demand snapshot, which might not meet the 2- minute RPO. Option D is unsafe because DynamoDB Streams are not a managed reverse- transaction rollback mechanism. PITR to a new table is the reliable recovery method.
質問 # 122
A company has an on-premises DNS solution and wants to resolve DNS records in an Amazon Route 53 private hosted zone for example.com. The company has set up an AWS Direct Connect connection for network connectivity between the on-premises network and the VPC. A CloudOps engineer must ensure that an on-premises server can query records in the example.com domain.
What should the CloudOps engineer do to meet these requirements?
正解：B
解説：
According to AWS Cloud Operations and Networking documentation, Route 53 Resolver inbound endpoints allow DNS queries to originate from on-premises DNS servers and resolve private hosted zone records in AWS. The inbound endpoint provides DNS resolver IP addresses within the VPC, which the on- premises DNS servers can forward queries to over AWS Direct Connect or VPN connections.
The inbound endpoint must be associated with a security group that permits inbound traffic on TCP and UDP port 53 from the on-premises DNS server IP addresses. This ensures that DNS requests from the on- premises environment reach the VPC Resolver for resolution of private domains like example.com.
By contrast, outbound endpoints are used for the opposite direction-resolving external (on-premises or internet) DNS names from within AWS VPCs. Therefore, only an inbound endpoint correctly satisfies the direction of resolution in this scenario.
Reference: AWS Cloud Operations & Route 53 Resolver Guide - Section: Inbound and Outbound Endpoints for Hybrid DNS Resolution
質問 # 123
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