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NEW QUESTION: 1
Your application is using an ELB in front of an Auto Scaling group of web/application servers deployed across two AZs and a Multi-AZ RDS Instance for data persistence.
The database CPU is often above 80% usage and 90% of I/O operations on the database are reads. To improve performance you recently added a single-node Memcached ElastiCache Cluster to cache frequent DB query results. In the next weeks the overall workload is expected to grow by 30%.
Do you need to change anything in the architecture to maintain the high availability or the application with the anticipated additional load? Why?
A. Yes, you should deploy the Memcached ElastiCache Cluster with two nodes in the same AZ as the RDS DB master instance to handle the load if one cache node fails.
B. Yes, you should deploy two Memcached ElastiCache Clusters in different AZs because the RDS instance will not be able to handle the load if the cache node fails.
C. No, if the cache node fails the automated ElastiCache node recovery feature will prevent any availability impact.
D. No, if the cache node fails you can always get the same data from the DB without having any availability impact.
Answer: B
Explanation:
Explanation/Reference:
Explanation:
ElastiCache for Memcached
The primary goal of caching is typically to offload reads from your database or other primary data source.
In most apps, you have hot spots of data that are regularly queried, but only updated periodically. Think of the front page of a blog or news site, or the top 100 leaderboard in an online game. In this type of case, your app can receive dozens, hundreds, or even thousands of requests for the same data before it's updated again. Having your caching layer handle these queries has several advantages. First, it's considerably cheaper to add an in-memory cache than to scale up to a larger database cluster. Second, an in-memory cache is also easier to scale out, because it's easier to distribute an in-memory cache horizontally than a relational database.
Last, a caching layer provides a request buffer in the event of a sudden spike in usage. If your app or game ends up on the front page of Reddit or the App Store, it's not unheard of to see a spike that is 10 to
100 times your normal application load. Even if you autoscale your application instances, a 10x request spike will likely make your database very unhappy.
Let's focus on ElastiCache for Memcached first, because it is the best fit for a cachingfocused solution.
We'll revisit Redis later in the paper, and weigh its advantages and disadvantages.
Architecture with ElastiCache for Memcached
When you deploy an ElastiCache Memcached cluster, it sits in your application as a separate tier alongside your database. As mentioned previously, Amazon ElastiCache does not directly communicate with your database tier, or indeed have any particular knowledge of your database. A simplified deployment for a web application looks something like this:
In this architecture diagram, the Amazon EC2 application instances are in an Auto Scaling group, located behind a load balancer using Elastic Load Balancing, which distributes requests among the instances. As requests come into a given EC2 instance, that EC2 instance is responsible for communicating with ElastiCache and the database tier. For development purposes, you can begin with a single ElastiCache node to test your application, and then scale to additional cluster nodes by modifying the ElastiCache cluster. As you add additional cache nodes, the EC2 application instances are able to distribute cache keys across multiple ElastiCache nodes. The most common practice is to use client-side sharding to distribute keys across cache nodes, which we will discuss later in this paper.
When you launch an ElastiCache cluster, you can choose the Availability Zone(s) that the cluster lives in.
For best performance, you should configure your cluster to use the same Availability Zones as your application servers. To launch an ElastiCache cluster in a specific Availability Zone, make sure to specify the Preferred Zone(s) option during cache cluster creation. The Availability Zones that you specify will be where ElastiCache will launch your cache nodes. We recommend that you select Spread Nodes Across Zones, which tells ElastiCache to distribute cache nodes across these zones as evenly as possible. This distribution will mitigate the impact of an Availability Zone disruption on your ElastiCache nodes. The trade- off is that some of the requests from your application to ElastiCache will go to a node in a different Availability Zone, meaning latency will be slightly higher. For more details, refer to Creating a Cache Cluster in the Amazon ElastiCache User Guide.
As mentioned at the outset, ElastiCache can be coupled with a wide variety of databases. Here is an example architecture that uses Amazon DynamoDB instead of Amazon RDS and MySQL:
This combination of DynamoDB and ElastiCache is very popular with mobile and game companies, because DynamoDB allows for higher write throughput at lower cost than traditional relational databases.
In addition, DynamoDB uses a key-value access pattern similar to ElastiCache, which also simplifies the programming model. Instead of using relational SQL for the primary database but then key-value patterns for the cache, both the primary database and cache can be programmed similarly. In this architecture pattern, DynamoDB remains the source of truth for data, but application reads are offloaded to ElastiCache for a speed boost.
NEW QUESTION: 2
A. Option A
B. Option D
C. Option B
D. Option C
Answer: A
NEW QUESTION: 3
조직에서 VPC를 사용하여 RDS를 설정합니다. 조직은 인터넷에서 RDS에 액세스 할 수 있기를 원합니다.
아래에서 언급 한 구성 중이 시나리오에서 필요하지 않은 것은 어느 것입니까?
A. 조직에서 RDS 인스턴스를 공개적으로 액세스 할 수 있도록 콘솔에서 매개 변수를 활성화해야 합니다.
B. 조직에서 외부 IP가있는 서브넷 그룹으로 RDS를 설정해야 합니다.
C. 조직에서 RDS VPC 보안 그룹의 인터넷 액세스를 허용해야 합니다.
D. 조직에서 VPC 속성 DNS 호스트 이름 및 DNS 확인을 사용하도록 설정해야 합니다.
Answer: B
Explanation:
설명
가상 사설망 (VPC)은 사용자의 AWS 계정 전용 가상 네트워크입니다. 사용자가 정의한 가상 네트워크에 RDS와 같은 AWS 리소스를 시작할 수 있습니다. 서브넷은 사용자가 보안 및 운영상의 필요에 따라 VPC 리소스 그룹으로 지정할 수있는 VPC의 IP 주소 범위의 세그먼트입니다. DB 서브넷 그룹은 사용자가 VPC에서 만들고 사용자가 RDS DB 인스턴스에 할당 할 수있는 서브넷 (일반적으로 개인)의 모음입니다. DB 서브넷 그룹을 사용하면 DB 인스턴스를 만들 때 특정 VPC를 지정할 수 있습니다. RDS 인스턴스가 인터넷에서 액세스 할 수 있어야 하는 경우 :
조직에서는 VPC 특성, DNS 호스트 이름 및 DNS 확인을 사용하여 RDS 인스턴스를 사용하도록 설정해야 합니다.
조직에서는 RDS 인스턴스를 공개적으로 액세스 할 수 있도록 콘솔에서 매개 변수를 활성화해야 합니다.
조직은 RDS VPC 보안 그룹에서 인터넷 액세스를 허용해야 합니다.
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_VPC.html
NEW QUESTION: 4
The main reason to establish internal controls in an organization is to:
A. Provide reasonable assurance on the achievement of objectives.
B. Safeguard the resources of the organization.
C. Ensure the accuracy, reliability, and timeliness of information.
D. Encourage compliance with policies and procedures.
Answer: A