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NEW QUESTION: 1
データベースサーバーで大量の読み取りが行われるため、企業のアプリケーションは人気が高まり、待ち時間が発生します。
このサービスには以下のプロパティがあります。
- Applicationを使用して1つの地域でホストされている高可用性REST API
オートスケーリング付きロードバランサ（ALB）。
- 単一のAmazon EC2インスタンスでホストされているMySQLデータベース
アベイラビリティーゾーン
- 同社は、待ち時間を減らし、地域内データベースの読み取りパフォーマンスを向上させ、データやパフォーマンスの損失なしに自動的にライブリカバリを実行できる複数地域の惨事復旧機能（HA / DR）を望んでいます。
どのような展開戦略がこれらの要件を満たしますか？
A. データベース読み取りクエリをキャッシュするために自動フェイルオーバーを備えたRedis Multi-AZ用のAmazon ElastiCacheを使用します。 AWS OpsWorksを使用して、APIレイヤー、キャッシュレイヤー、および既存のデータベースレイヤーを2つのリージョンにデプロイします。プライマリリージョンのヘルスチェックが失敗した場合は、ALBでAmazon Route 53ヘルスチェックを使用してスタンバイリージョンへのDNSフェイルオーバーをトリガーします。 MySQLデータベースを頻繁にバックアップし、アクティブ領域で障害が発生した場合は、バックアップをスタンバイ領域にコピーしてスタンバイデータベースを復元します。
B. AWS CloudFormation StackSetsを使用して2つの地域にAPIレイヤーをデプロイします。データベースをAuto Scalingグループに追加します。 2番目の領域のデータベースにリードレプリカを追加します。プライマリリージョンでAmazon Route 53ヘルスチェックを使用すると失敗します。クロスリージョンデータベースレプリカをマスターにし、スタンバイリージョンに新しいリードレプリカを作成します。
C. AWS CloudFormation StackSetsを使用して2つの地域にAPIレイヤーをデプロイします。 1つのリージョンに複数のリードレプリカがあり、ソースデータベースクラスターとは異なるリージョンにリードレプリカがある、MySQLデータベースクラスター付きのAmazon Auroraにデータベースを移行します。プライマリロードバランサーへのヘルスチェックが失敗した場合は、Amazon Route 53ヘルスチェックを使用してスタンバイリージョンへのDNSフェイルオーバーをトリガーします。 Route 53がフェイルオーバーした場合は、クロスリージョンデータベースレプリカをマスターにし、スタンバイリージョンに新しいリードレプリカを作成します。
D. Redis Multi-AZ用のAmazon ElastiCacheを自動フェールオーバーとともに使用して、データベース読み取りクエリをキャッシュします。 AWS OpsWorksを使用して、APIレイヤー、キャッシュレイヤー、および既存のデータベースレイヤーを2つのリージョンにデプロイします。障害が発生した場合、プライマリリージョンのヘルスチェックが失敗した場合は、データベースでAmazon Route 53ヘルスチェックを使用してスタンバイリージョンへのDNSフェイルオーバーをトリガーします。 MySQLデータベースを頻繁にバックアップし、アクティブ領域で障害が発生した場合は、バックアップをスタンバイ領域にコピーしてスタンバイデータベースを復元します。
Answer: C
NEW QUESTION: 2
An administrator is configuring virtual machines to use Worldwide Port Names (WWPNs) to access the storage.
Which two conditions are required? (Choose two.)
A. The switches in the fabric must be N-Port ID Virtualization aware.
B. The switches in the fabric must be Storage I/O Control aware.
C. The virtual machines must be using passthrough Raw Disk Mapping (RDMp).
D. The virtual machines must be using Virtual Machine Disk (VMDK).
Answer: A,C
Explanation:
Explanation/Reference:
Explanation: N-Port ID Virtualization
N-Port ID Virtualization (NPIV) is an ANSI T11 standard that describes how a single Fibre Channel HBA port can register with the fabric using several worldwide port names (WWPNs). This allows a fabric- attached N-port to claim multiple fabric addresses. Each address appears as a unique entity on the Fibre Channel fabric How NPIV-Based LUN Access Works
NPIV enables a single FC HBA port to register several unique WWNs with the fabric, each of which can be assigned to an individual virtual machine.
SAN objects, such as switches, HBAs, storage devices, or virtual machines can be assigned World Wide Name (WWN) identifiers. WWNs uniquely identify such objects in the Fibre Channel fabric. When virtual machines have WWN assignments, they use them for all RDM traffic, so the LUNs pointed to by any of the RDMs on the virtual machine must not be masked against its WWNs. When virtual machines do not have WWN assignments, they access storage LUNs with the WWNs of their host's physical HBAs. By using NPIV, however, a SAN administrator can monitor and route storage access on a per virtual machine basis.
The following section describes how this works.
Reference: https://pubs.vmware.com/vsphere-4-esx-vcenter/
index.jsp#com.vmware.vsphere.config_fc.doc_40/esx_san_config/managing_san_systems/c_n- port_id_virtualization.html
NEW QUESTION: 3
In Amazon ElastiCache, which of the following statements is correct?
A. If your AWS account supports only the EC2-VPC platform, ElastiCache will never launch your cluster in
a VPC.
B. ElastiCache is not fully integrated with Amazon Virtual Private Cloud (VPC).
C. You cannot use ElastiCache in a VPC that is configured for dedicated instance tenancy.
D. When you launch an ElastiCache cluster into an Amazon VPC private subnet, every cache node is
assigned a public IP address within that subnet.
Answer: C
Explanation:
The VPC must allow non-dedicated EC2 instances. You cannot use ElastiCache in a VPC that is
configured for dedicated instance tenancy.
Reference: http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/AmazonVPC.EC.html