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NEW QUESTION: 1
HOTSPOT
Your network contains two servers named Server1 and Server2 that run Windows Server 2012 R2.
Server1 and Server2 have the Hyper-V server role installed.
Server1 and Server2 have different processor models from the same manufacturer.
On Server1, you plan to create a virtual machine named VM1. Eventually, VM1 will be exported to Server2.
You need to ensure that when you import VM1 to Server2, you can start VM1 from saved snapshots.
What should you configure on VM1?
To answer, select the appropriate node in the answer area.
Hot Area:

Answer:
Explanation:

Explanation/Reference:
Explanation:
Use the Processor Compatibility Mode only in cases where VMs will migrate from one Hyper-V-enabled processor type to another within the same vendor processor family.
Reference: When to Use Processor Compatibility Mode to Migrate Virtual Machines technet.microsoft.com/en-us/magazine/gg299590.aspx

NEW QUESTION: 2
애플리케이션은 데이터 지속성을 위해 두 개의 AZ와 다중 AZ RDS 인스턴스에 배포 된 웹 / 애플리케이션 서버의 Auto Scaling 그룹 앞에서 ELB를 사용하고 있습니다.
데이터베이스 CPU는 종종 사용량이 80 % 이상이며 데이터베이스에서 I / O 작업의 90 %를 읽습니다. 성능을 향상시키기 위해 최근에 자주 단일 DB 쿼리 결과를 캐시하기 위해 단일 노드 Memcached ElastiCache 클러스터를 추가했습니다. 다음 주에는 전체 작업량이 30 % 증가 할 것으로 예상됩니다.
예상되는 추가로드로 고 가용성 또는 응용 프로그램을 유지 보수하려면 아키텍처에서 무엇을 변경해야합니까? 왜?
A. 예. 캐시 노드에 장애가 발생하면 RDS 인스턴스가로드를 처리 할 수 없으므로 서로 다른 AZ에 2 개의 Memcached ElastiCache 클러스터를 배포해야 합니다.
B. 아니요, 캐시 노드가 실패하면 가용성에 영향을주지 않고 DB에서 항상 동일한 데이터를 얻을 수 있습니다.
C. 예. 하나의 캐시 노드가 실패 할 경우로드를 처리하려면 RDS DB 마스터 인스턴스와 동일한 AZ에 두 개의 노드가있는 Memcached ElastiCache 클러스터를 배포해야 합니다.
D. 아니요, 캐시 노드에 장애가 발생하면 자동 ElastiCache 노드 복구 기능이 가용성에 미치는 영향을 방지합니다.
Answer: A
Explanation:
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 caching focused 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: 3

A. Yes
B. Only in certain regions
C. No
D. Only in VPC
Answer: A

NEW QUESTION: 4
Oliver Goldsmith (17301774) wrote criticism, plays, novels, biographies, travelogues, and nearly every
other conceivable kind of composition. This good-humored essay is from a series published in the Public
Ledger and then in book form as The Citizen of the World (1762).
Were we to estimate the learning of the English by the number of books that are every day published
among them, perhaps no country, not even China itself, could equal them in this particular. I have
reckoned not less than twenty-three new books published in one day, which, upon computation, makes
eight thousand three hundred and ninety-five in one year. Most of these are not confined to one single
science, but embrace the whole circle. History, politics, poetry, mathematics, metaphysics, and the
philosophy of nature, are all comprised in a manual no larger than that in which our children are taught the
letters. If then, we suppose the learned of England to read but an eighth part of the works which daily
come from the press and surely non can pretend to learning upon less easy terms), at this rate every
scholar will read a thousand books in one year. From such a calculation, you may conjecture what an
amazing fund of literature a man must be possessed of, who thus reads three new books every day, not
one of which but contains all the good things that ever were said or written.
And yet I know not how it happens, but the English are not, in reality so learned as would seem from this
calculation. We meet but few who know all arts and sciences to perfection; whether it is that the generality
are incapable of such extensive knowledge, or that the authors of those books are not adequate
instructors. In China, the Emperor himself takes cognizance of all the doctors in the kingdom who profess
authorship. In England, every man may be an author, that can write; for they have by law a liberty, not
only of saying what they please, but of being also as dull as they please.
Yesterday, as I testified to my surprise, to the man in black, where writers could be found in sufficient
number to throw off the books I saw daily crowding from the press. I at first imagined that their learned
seminaries might take this method of instructing the world. But, to obviate this objection, my companion
assured me that the doctors of colleges never wrote, and that some of them had actually forgot their
reading. "But if you desire," continued he, "to see a collection of authors, I fancy I can introduce you to a
club, which assembles every Saturday at seven . . . ." I accepted his invitation; we walked together, and
entered the house some time before the usual hour for the company assembling. My friend took this
opportunity of letting me into the characters of the principal members of the club . . .
"The first person," said he, "of our society is Doctor Nonentity, a metaphysician. Most people think him a
profound scholar, but, as he seldom speaks, I cannot be positive in that particular; he generally spreads
himself before the fire, sucks his pipe, talks little, drinks much, and is reckoned very good company. I'm
told he writes indexes to perfection: he makes essays on the origin of evil, philosophical inquiries upon
any subject, and draws up an answer to any book upon 24 hours' warning . . . ."
The word obviate (paragraph 4) means
A. obscure
B. facilitate
C. turn
D. clarify
E. negate
Answer: E
Explanation:
Goldsmith suggests that seminaries might be publishing this glut of books to educate the world, but his
friend voids that argument in the next sentence.

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