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Exam Code: EX248

Exam Name: Red Hat Certified Specialist in Enterprise Application Server Administration exam

Version: V15.35

Q & A: 208 Questions and Answers

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NEW QUESTION: 1
SPECIAL INSTRUCTIONS REMINDER
The remaining questions are associated with two cases.
Each case has an introductory, descriptive passage (case text) that describes background information and requirements for a specific cloud based design. And each case has a set of six related, randomized questions.
You will need to read the case text in order to answer the related questions correctly.
Given that there are two cases with six scored questions each, the total number of case-based scored questions is 12.
When you display each questions you can easily review the related case text in a pop-up window by clicking on the "Case" icon (shown below) Case 4 Refer to the exhibit.

Your company is currently using a traditional SAN storage network. The server infrastructure is partially virtualized. There is a public cloud in place that is used to test development and application migration to cloud.
Business requirements:
* Consolidate the network, storage, and compute resources
* Simplify network management and storage provisioning
* Maintain application performance
* Need to share resources to reduce cost and improve efficiency
Other considerations:
* Monitoring of protection SLAs
* All transactions must be logged for auditing review
* Users are validated using internal credentials
Refer to Case 4.
You are designing a transformation from Platform 2.0 to cloud. You review the existing infrastructure and business requirements. You must detect events that can exploit vulnerabilities in the cloud. Which technology should you select?
A. ISO
B. Firewall
C. PCI DSS
D. IDPS
Answer: D

NEW QUESTION: 2
귀하의 응용 프로그램은 데이터 지속성을 위해 2 개의 AZ 및 다중 AZ RDS 인스턴스에 배포 된 웹 / 응용 프로그램 서버의 자동 확장 그룹 앞에서 ELB를 사용합니다.
The database CPU is often above 80% usage and 90% of 1/0 operations on the database are reads. 성능을 향상시키기 위해 최근에는 자주 사용되는 DB 쿼리 결과를 캐시하기 위해 단일 노드 Memcached ElastiCache 클러스터를 추가했습니다. 다음 주에는 전반적인 작업 부하가 30 % 증가 할 것으로 예상됩니다.
Do you need to change anything in the architecture to maintain the high availability or the application with the anticipated additional load? Why?
A. No, if the cache node fails the automated ElastiCache node recovery feature will prevent any availability impact.
B. 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.
C. 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.
D. No, if the cache node fails you can always get the same data from the DB without having any availability impact.
Answer: C
Explanation:
설명:
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
1 00 times your normal application load. Even if you autoscale your application instances, a lOx 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 caching focused solution.
We'll revisit Redislater 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 t he 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.

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