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NEW QUESTION: 1
The H.323 node comprises terminal, MCU and gateway.
A. True
B. False
Answer: A

NEW QUESTION: 2
Which of the following would NOT trigger Service Level Management activity?
A. Service breaches
B. Service review meetings
C. Standard Changes
D. Changes in strategy or policy
Answer: C

NEW QUESTION: 3
도메인 이름 .example.com 아래 여러 AWS 리전에서 전 세계 잠재 고객을 대상으로 하는 웹 애플리케이션을 배포했습니다. Route53 대기 시간 기반 라우팅을 사용하여 사용자와 가장 가까운 지역의 사용자에게 웹 요청을 제공하기로 결정했습니다. 서버 가동 중지시 비즈니스 연속성을 제공하기 위해 리전별로 별도의 가용 영역에서 두 개의 웹 서버와 연결된 가중치 레코드 세트를 구성합니다.
DR 테스트를 실행하면 리전 중 하나에서 모든 웹 서버를 비활성화하면 Route53이 모든 사용자를 자동으로 다른 리전으로 안내하지는 않습니다.
무슨 일이야? (2 답변 선택)
A. 서버를 비활성화 한 리전의 example com과 연관된 대기 시간 별칭 리소스 레코드 세트에서 "대상 상태 평가"를 "예"로 설정하지 않았습니다.
B. 다른 지역에서 작동하는 두 웹 서버 중 하나가 HTTP 상태 확인을 통과하지 못했습니다.
C. 비활성화 된 서버가있는 리전에서 설정된 대기 시간 별칭 리소스 레코드와 관련된 가중치 값이 다른 리전의 가중치보다 높습니다.
D. 대기 시간 리소스 레코드 세트는 가중 리소스 레코드 세트와 함께 사용할 수 없습니다.
E. 비활성화 된 웹 서버와 관련된 하나 이상의 가중 리소스 레코드 세트에 HTTP 상태 확인을 설정하지 않았습니다.
Answer: A,E
Explanation:
Explanation
How Health Checks Work in Complex Amazon Route 53 Configurations
Checking the health of resources in complex configurations works much the same way as in simple configurations. However, in complex configurations, you use a combination of alias resource record sets (including weighted alias, latency alias, and failover alias) and nonalias resource record sets to build a decision tree that gives you greater control over how Amazon Route 53 responds to requests. For more information, see How Health Checks Work in Simple Amazon Route 53 Configurations.
For example, you might use latency alias resource record sets to select a region close to a user and use weighted resource record sets for two or more resources within each region to protect against the failure of a single endpoint or an Availability Zone. The following diagram shows this configuration.

Here's how Amazon EC2 and Amazon Route 53 are configured:
You have Amazon EC2 instances in two regions, us-east-1 and ap-southeast-2. You want Amazon Route 53 to respond to queries by using the resource record sets in the region that provides the lowest latency for your customers, so you create a latency alias resource record set for each region. (You create the latency alias resource record sets after you create resource record sets for the individual Amazon EC2 instances.) Within each region, you have two Amazon EC2 instances. You create a weighted resource record set for each instance. The name and the type are the same for both of the weighted resource record sets in each region.
When you have multiple resources in a region, you can create weighted or failover resource record sets for your resources. You can also create even more complex configurations by creating weighted alias or failover alias resource record sets that, in turn, refer to multiple resources.
Each weighted resource record set has an associated health check. The IP address for each health check matches the IP address for the corresponding resource record set. This isn't required, but it's the most common configuration.
For both latency alias resource record sets, you set the value of Evaluate Target Health to Yes.
You use the Evaluate Target Health setting for each latency alias resource record set to make Amazon Route 53 evaluate the health of the alias targets-the weighted resource record sets-and respond accordingly.

The preceding diagram illustrates the following sequence of events:
Amazon Route 53 receives a query for example.com. Based on the latency for the user making the request, Amazon Route 53 selects the latency alias resource record set for the us-east-1 region.
Amazon Route 53 selects a weighted resource record set based on weight. Evaluate Target Health is Yes for the latency alias resource record set, so Amazon Route 53 checks the health of the selected weighted resource record set.
The health check failed, so Amazon Route 53 chooses another weighted resource record set based on weight and checks its health. That resource record set also is unhealthy.
Amazon Route 53 backs out of that branch of the tree, looks for the latency alias resource record set with the next-best latency, and chooses the resource record set for ap-southeast-2.
Amazon Route 53 again selects a resource record set based on weight, and then checks the health of the selected resource record set. The health check passed, so Amazon Route 53 returns the applicable value in response to the query.
What Happens When You Associate a Health Check with an Alias Resource Record Set?
You can associate a health check with an alias resource record set instead of or in addition to setting the value of Evaluate Target Health to Yes. However, it's generally more useful if Amazon Route 53 responds to queries based on the health of the underlying resources-the HTTP servers, database servers, and other resources that your alias resource record sets refer to. For example, suppose the following configuration:
You assign a health check to a latency alias resource record set for which the alias target is a group of weighted resource record sets.
You set the value of Evaluate Target Health to Yes for the latency alias resource record set.
In this configuration, both of the following must be true before Amazon Route 53 will return the applicable value for a weighted resource record set:
The health check associated with the latency alias resource record set must pass.
At least one weighted resource record set must be considered healthy, either because it's associated with a health check that passes or because it's not associated with a health check. In the latter case, Amazon Route 53 always considers the weighted resource record set healthy.

If the health check for the latency alias resource record set fails, Amazon Route 53 stops responding to queries using any of the weighted resource record sets in the alias target, even if they're all healthy. Amazon Route 53 doesn't know the status of the weighted resource record sets because it never looks past the failed health check on the alias resource record set.
What Happens When You Omit Health Checks?
In a complex configuration, it's important to associate health checks with all of the non-alias resource record sets. Let's return to the preceding example, but assume that a health check is missing on one of the weighted resource record sets in the us-east-1 region:

Here's what happens when you omit a health check on a non-alias resource record set in this configuration:
Amazon Route 53 receives a query for example.com. Based on the latency for the user making the request, Amazon Route 53 selects the latency alias resource record set for the us-east-1 region.
Amazon Route 53 looks up the alias target for the latency alias resource record set, and checks the status of the corresponding health checks. The health check for one weighted resource record set failed, so that resource record set is omitted from consideration.
The other weighted resource record set in the alias target for the us-east-1 region has no health check. The corresponding resource might or might not be healthy, but without a health check, Amazon Route 53 has no way to know. Amazon Route 53 assumes that the resource is healthy and returns the applicable value in response to the query.
What Happens When You Set Evaluate Target Health to No?
In general, you also want to set Evaluate Target Health to Yes for all of the alias resource record sets. In the following example, all of the weighted resource record sets have associated health checks, but Evaluate Target Health is set to No for the latency alias resource record set for the us-east-1 region:

Here's what happens when you set Evaluate Target Health to No for an alias resource record set in this configuration:
Amazon Route 53 receives a query for example.com. Based on the latency for the user making the request, Amazon Route 53 selects the latency alias resource record set for the us-east-1 region.
Amazon Route 53 determines what the alias target is for the latency alias resource record set, and checks the corresponding health checks. They're both failing.
Because the value of Evaluate Target Health is No for the latency alias resource record set for the us-east-1 region, Amazon Route 53 must choose one resource record set in this branch instead of backing out of the branch and looking for a healthy resource record set in the ap-southeast-2 region.