AWS Certified Cloud Practitioner

Selected Answer: D
The best option for the company to ensure that users can view videos with low latency would be to use Amazon CloudFront. CloudFront is a content delivery network (CDN) that speeds up the delivery of static and dynamic web content, such as HTML, CSS, JavaScript, and images, as well as videos.

Selected Answer: D
Option D Amazon CloudFront

Selected Answer: D
The best Amazon service provider for low latency on videos is Amazon CloudFront. This service offers several advantages as a Content Delivery Network (CDN) service, including faster content delivery, increased reliability, cost-effectiveness, and integration with other AWS services

Selected Answer: D
Cloudfront is content delivery network used to deliver static web content, videoes, images to users in a low latency hence high speeds. You can build test and deploy your code with cloudfront as it is a native feature

Selected Answer: D
Amazon CloudFront (CDN) that speeds up the delivery of static and dynamic web content, such as HTML, CSS, JavaScript, and images, as well as videos by leveraging the highly resilient Amazon Backbone Network and delivering the data securely to the user locally using Local Cache zones (Edge Locations) instead of fetching from the Origins. This reduces the overall latency and subsequently increases the average performance.

Selected Answer: D
cloud front is DNS service

The best option for ensuring that all users can view videos with low latency is D. Amazon CloudFront.

A company is planning to run a global marketing application in the AWS Cloud. The application will feature videos that can be viewed by users. The company must ensure that all users can view these videos with low latency.
Which AWS service should the company use to meet this requirement?

in exam, How many percent of the same question?

exactly. dont go with this "correct" answer. I failed in my exam after following this answers.

Selected Answer: C
Who's providing the "correct" answer here? Answers should all be reviewed, you're confusing the examinees. C should be the answer.

C is the correct answer, the question explicitly mentioned that "The application cannot sustain any interruption" of which Spot Instances are ideal for workloads with flexible start and end times, or that can withstand interruptions. Ideally we want pricing that doesn't allow interruption in this case it will be On-Demand.

Selected Answer: C
Can't be B. Spot instances are bid-based and can be terminated if the spot price exceeds your bid...

Selected Answer: C
Option C.
Reserved Instances provide cost savings for the predictable baseline usage.
On-Demand Instances, while more expensive than RIs, ensure availability for the seasonal spikes without long-term commitments.
This combination ensures no interruptions while balancing cost and flexibility.

Selected Answer: C
Buy Reserved Instances for the predicted amount of usage throughout the year. Allow any seasonal usage to run at an On-Demand rate.

Selected Answer: C
Correct answer is C
on-demand: No interruptions
spot Instance: Slight risk of interruptions

The correct answer is B. To answer an AWS exams correctly, always find the keyword(s). The answer cannot be B because of the keywords there is "The application cannot sustain any interruption."
Reserved Instances (RIs) are ideal for workloads with predictable usage because they offer significant savings compared to On-Demand rates.
Since the seasonal spikes last only a few weeks, running them at the On-Demand rate would be more flexible and cost-effective than over-provisioning RIs for the whole

Though spot instances are cheaper, they are meant for applications that can withstand interruptions, that cancels B. 
Option C, on the other hand provides a balance between cost savings and maintaining uninterrupted service.

Selected Answer: C
The most cost-effective option for this scenario is C.
Here's why:

Reserved Instances (RIs) are typically used for predictable workloads, offering significant discounts over On-Demand pricing. Buying RIs for the year-round predictable usage ensures cost savings.
On-Demand Instances for the seasonal spikes allow flexibility during peak periods without having to commit to paying for capacity that isn't needed for the rest of the year. Although On-Demand rates are higher than Reserved Instances, they avoid unnecessary upfront costs for periods when the application doesn’t need extra capacity.

"The application cannot sustain any interruption" which automatically disqualifies B with Spot Instances.

Selected Answer: B
The correct answer is B. If you refer back to the course and listen again to the videos with the coffee shop example you will hear that B is the correct answer to this case scenario. When the reserved instances meet spikes the AWS autoscale will indeed add spot instances ( to work on the spot ) and cover the spike so that everything is scaled and the services keep running with no delays ( that Spot instance payment will be similar to the On demand instance type payment ) , On-Demand in AWS services does not mean that an instance is launched on demand, it simply is a referral to an intsance type that is launched already which you pay for as you go, which means that you only pay for the demanded capacity used. 
Please feel free to correct me if i am wrong

The question have a phrase which states the following "The application cannot sustain any interruption." Meaning if the application was going to sustain interpretation option B would be stand a chance to be an option as the answer.

Now option B is not a choice at all. Correct Answer is C.

A is the correct answer as well. But you have to pay attention to the question "Which purchase option meets these requirements MOST cost-effectively?" -> You can choose A if it don't have "Most cost-effectively" -> C is the correct answer

Its definitely C as the correct answer.
Spot instance is clearly in the textbook that has uncontrolled interruptions within apps and services.

C
Spot Instances could introduce interruptions, which is not acceptable for an application that cannot sustain any interruption.

The question clearly mentions that the application cannot withstand interruptions. Spot instances can be terminated with a grace period (initmation) of 2 minutes. So option B is eliminated. Only option C remains and should be treated as the right answer.

Selected Answer: B
Yes B, Spot Instance allow you to bidding over the available AWS computing resources and allow you to use computing resource over the period of time, it's suitable for spike demand which can be interrupted. If you won the bidding the computing power will be your over the time while you own it if other won the bidding, you resources from previous will be lost this is mean your App on EC2 instance will be stop and choose Spot Instance is not suite for this requirement.

A user is comparing purchase options for an application that runs on Amazon EC2 and Amazon RDS. The application cannot sustain any interruption. The application experiences a predictable amount of usage, including some seasonal spikes that last only a few weeks at a time. It is not possible to modify the application.
Which purchase option meets these requirements MOST cost-effectively?

Selected Answer: B
Network ACL >>> Subnet level
Security Groups >>>> Instance level

Selected Answer: B
Option B - Network ACL

Selected Answer: B
A Network ACL is a feature of Amazon Virtual Private Cloud (VPC) that acts as a firewall at the subnet level. It is an optional layer of security that controls inbound and outbound traffic at the subnet level. A Network ACL operates at the protocol and port level and uses numbered rules to allow or deny traffic. By default, a Network ACL allows all inbound and outbound traffic.

Selected Answer: B
subnet so answer is b,if instance choose C

Selected Answer: B
The security groups is a firewalling solution at instance level. The right answer is B.

Selected Answer: B
The key is SUBNET LEVEL

The answer is B....."A network access control list (ACL) allows or denies specific inbound or outbound traffic at the SUBNET LEVEL"

Keyword here is subnet, therefore the correct answer is B: Network ACL

Selected Answer: B
NACL is at subnet level, security group at the EC2 instance level

https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html?ref=wellarchitected

Selected Answer: B
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-network-acls.html
"A network access control list (ACL) allows or denies specific inbound or outbound traffic at the subnet level. "

Selected Answer: B
At subnet level is Network ACL so B is correct

Selected Answer: A
I would think A is more similar to a FW

Which AWS tool or feature acts as a VPC firewall at the subnet level?

Selected Answer: B
https://docs.aws.amazon.com/sqs/?id=docs_gateway

Amazon Simple Queue Service (Amazon SQS) is a fully managed message queuing service that makes it easy to decouple and scale microservices, distributed systems, and serverless applications. Amazon SQS moves data between distributed application components and helps you decouple these components.

Selected Answer: B
B. Amazon Simple Queue Service (Amazon SQS)

Selected Answer: B
Amazon Simple Queue Service (Amazon SQS) is an AWS service that can be used to decouple applications. It provides a fully managed message queuing service that enables applications to communicate asynchronously by sending and receiving messages. It allows different components of an application to work independently and asynchronously, without directly integrating or depending on each other.
By using Amazon SQS, applications can send messages to a queue, and other components can retrieve and process those messages at their own pace. This decouples the components and allows them to scale independently, improving the overall flexibility and fault tolerance of the application architecture.

Selected Answer: B
A decoupled application architecture allows each component to perform its tasks independently

It is B , Only logical choice used with application runtimes

Which AWS service can be used to decouple applications?

I jumped into the comments to post my graph but yours is much better! Thanks for posting it! Great description of the services on that site, too.

Selected Answer: C
C - Nice graph here: https://docs.aws.amazon.com/whitepapers/latest/disaster-recovery-workloads-on-aws/disaster-recovery-options-in-the-cloud.html

Selected Answer: C
Backup and Restore ---- cheapest
Pilot light --- cheap
Warm standby ---- costlier 
Multisite ---- costliest

Selected Answer: C
OPTION C - BACKUP ANS RESTORE

Para mim, esse tipo de questão não tem nada haver com a prova, totalmente fora do escopo

Selected Answer: C
https://docs.aws.amazon.com/whitepapers/latest/disaster-recovery-workloads-on-aws/disaster-recovery-options-in-the-cloud.html

Selected Answer: C
Among the provided options, backup and restore is generally the least expensive disaster recovery option. It involves periodically backing up data and applications to a separate location or storage, and in the event of a disaster, restoring the backups to resume operations. This approach typically requires fewer resources and infrastructure compared to other options.

Selected Answer: C
C. Backup and restore

COOL to HOT
C. Backup and restore - D. Pilot light - A. Warm standby - B. Multisite
https://docs.aws.amazon.com/whitepapers/latest/disaster-recovery-workloads-on-aws/disaster-recovery-options-in-the-cloud.html

Selected Answer: C
C. is the correct answer.

Which disaster recovery option is the LEAST expensive?

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