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To earn the Amazon SAA-C03 Certification, candidates need to pass a multiple-choice exam that covers a wide range of topics related to AWS services, architecture patterns, and best practices. SAA-C03 exam also tests the candidate's ability to design and deploy secure and reliable applications on AWS while considering cost optimization and performance efficiency. AWS Certified Solutions Architect - Associate certification is intended for solutions architects, developers, and IT professionals who are responsible for designing and deploying applications on AWS.
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NEW QUESTION # 706
A company has a web application hosted over 10 Amazon EC2 instances with traffic directed by Amazon Route 53. The company occasionally experiences a timeout error when attempting to browse the application.
The networking team finds that some DNS queries return IP addresses of unhealthy instances, resulting in the timeout error.
What should a solutions architect implement to overcome these timeout errors?
Answer: A
Explanation:
Explanation
An Application Load Balancer (ALB) allows you to distribute incoming traffic across multiple backend instances, and can automatically route traffic to healthy instances while removing traffic from unhealthy instances. By using an ALB in front of the EC2 instances and routing traffic to it from Route 53, the load balancer can perform health checks on the instances and only route traffic to healthy instances, which should help to reduce or eliminate timeout errors caused by unhealthy instances.
NEW QUESTION # 707
A company runs a Windows-based ecommerce application on Amazon EC2 instances. The application has a very high transaction rate. The company requires a durable storage solution that can deliver 200,000 IOPS for each EC2 instance.
Which solution will meet these requirements?
Answer: C
Explanation:
Amazon EBS io2 Block Express volumes are designed to deliver sub-millisecond latency and up to 256,000 IOPS per volume, with durability and high availability. This makes io2 Block Express the recommended choice for workloads requiring very high and predictable IOPS, such as enterprise databases and high- transaction-rate applications.
Reference Extract:
"EBS io2 Block Express volumes deliver up to 256,000 IOPS and sub-millisecond latency, supporting high- performance, high-durability workloads." Source: AWS Certified Solutions Architect - Official Study Guide, EBS Performance section.
NEW QUESTION # 708
One member of your DevOps team consulted you about a connectivity problem in one of your Amazon EC2 instances. The application architecture is initially set up with four EC2 instances, each with an EIP address that all belong to a public non-default subnet. You launched another instance to handle the increasing workload of your application. The EC2 instances also belong to the same security group.
Everything works well as expected except for one of the EC2 instances which is not able to send nor receive traffic over the Internet.
Which of the following is the MOST likely reason for this issue?
Answer: C
Explanation:
IP addresses enable resources in your VPC to communicate with each other and with resources over the Internet. Amazon EC2 and Amazon VPC support the IPv4 and IPv6 addressing protocols.
By default, Amazon EC2 and Amazon VPC use the IPv4 addressing protocol. When you create a VPC, you must assign it an IPv4 CIDR block (a range of private IPv4 addresses). Private IPv4 addresses are not reachable over the Internet. To connect to your instance over the Internet or to enable communication between your instances and other AWS services that have public endpoints, you can assign a globally-unique public IPv4 address to your instance.
You can optionally associate an IPv6 CIDR block with your VPC and subnets and assign IPv6 addresses from that block to the resources in your VPC. IPv6 addresses are public and reachable over the Internet.
All subnets have a modifiable attribute that determines whether a network interface created in that subnet is assigned a public IPv4 address and, if applicable, an IPv6 address. This includes the primary network interface (eth0) that's created for an instance when you launch an instance in that subnet.
Regardless of the subnet attribute, you can still override this setting for a specific instance during launch.
By default, nondefault subnets have the IPv4 public addressing attribute set to false, and default subnets have this attribute set to true. An exception is a nondefault subnet created by the Amazon EC2 launch instance wizard - the wizard sets the attribute to true. You can modify this attribute using the Amazon VPC console.
In this scenario, there are 5 EC2 instances that belong to the same security group that should be able to connect to the Internet. The main route table is properly configured but there is a problem connecting to one instance. Since the other four instances are working fine, we can assume that the security group and the route table are correctly configured. One possible reason for this issue is that the problematic instance does not have a public or an EIP address.
Take note as well that the four EC2 instances all belong to a public non-default subnet. This means that a new EC2 instance will not have a public IP address by default since the since IPv4 public addressing attribute is initially set to false.
Hence, the correct answer is the option that says: The EC2 instance does not have a public IP address associated with it.
The option that says: The route table is not properly configured to allow traffic to and from the Internet through the Internet gateway is incorrect because the other three instances, which are associated with the same route table and security group, do not have any issues.
The option that says: The EC2 instance is running in an Availability Zone that is not connected to an Internet gateway is incorrect because there is no relationship between the Availability Zone and the Internet Gateway (IGW) that may have caused the issue. References:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario1.html
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-ip-addressing.html#vpc-ip-addressing-subnet Check out this Amazon VPC Cheat Sheet:
https://tutorialsdojo.com/amazon-vpc/
NEW QUESTION # 709
A solutions architect is designing the architecture of a new application being deployed to the AWS Cloud. The application will run on Amazon EC2 On-Demand Instances and will automatically scale across multiple Availability Zones. The EC2 instances will scale up and down frequently throughout the day. An Application Load Balancer (ALB) will handle the load distribution. The architecture needs to support distributed session data management. The company is willing to make changes to code if needed.
What should the solutions architect do to ensure that the architecture supports distributed session data management?
Answer: A
Explanation:
Explanation
https://aws.amazon.com/vi/caching/session-management/
In order to address scalability and to provide a shared data storage for sessions that can be accessible from any individual web server, you can abstract the HTTP sessions from the web servers themselves. A common solution to for this is to leverage an In-Memory Key/Value store such as Redis and Memcached. ElastiCache offerings for In-Memory key/value stores include ElastiCache for Redis, which can support replication, and ElastiCache for Memcached which does not support replication.
NEW QUESTION # 710
A company is designing a new web application that will run on Amazon EC2 Instances. The application will use Amazon DynamoDB for backend data storage. The application traffic will be unpredictable. T company expects that the application read and write throughput to the database will be moderate to high. The company needs to scale in response to application traffic.
Which DynamoDB table configuration will meet these requirements MOST cost-effectively?
Answer: D
Explanation:
The most cost-effective DynamoDB table configuration for the web application is to configure DynamoDB in on-demand mode by using the DynamoDB Standard table class. This configuration will allow the company to scale in response to application traffic and pay only for the read and write requests that the application performs on the table.
On-demand mode is a flexible billing option that can handle thousands of requests per second without capacity planning. On-demand mode automatically adjusts the table's capacity based on the incoming traffic, and charges only for the read and write requests that are actually performed. On-demand mode is suitable for applications with unpredictable or variable workloads, or applications that prefer the ease of paying for only what they use1.
The DynamoDB Standard table class is the default and recommended table class for most workloads. The DynamoDB Standard table class offers lower throughput costs than the DynamoDB Standard-Infrequent Access (DynamoDB Standard-IA) table class, and is more cost-effective for tables where throughput is the dominant cost. The DynamoDB Standard table class also offers the same performance, durability, and availability as the DynamoDB Standard-IA table class2.
The other options are not correct because they are either not cost-effective or not suitable for the use case. Configuring DynamoDB with provisioned read and write by using the DynamoDB Standard table class, and setting DynamoDB auto scaling to a maximum defined capacity is not correct because this configuration requires manual estimation and management of the table's capacity, which adds complexity and cost to the solution. Provisioned mode is a billing option that requires users to specify the amount of read and write capacity units for their tables, and charges for the reserved capacity regardless of usage. Provisioned mode is suitable for applications with predictable or stable workloads, or applications that require finer-grained control over their capacity settings1. Configuring DynamoDB with provisioned read and write by using the DynamoDB Standard-Infrequent Access (DynamoDB Standard-IA) table class, and setting DynamoDB auto scaling to a maximum defined capacity is not correct because this configuration is not cost-effective for tables with moderate to high throughput. The DynamoDB Standard-IA table class offers lower storage costs than the DynamoDB Standard table class, but higher throughput costs. The DynamoDB Standard-IA table class is optimized for tables where storage is the dominant cost, such as tables that store infrequently accessed data2. Configuring DynamoDB in on-demand mode by using the DynamoDB Standard-Infrequent Access (DynamoDB Standard-IA) table class is not correct because this configuration is not cost-effective for tables with moderate to high throughput. As mentioned above, the DynamoDB Standard-IA table class has higher throughput costs than the DynamoDB Standard table class, which can offset the savings from lower storage costs.
Reference:
Table classes - Amazon DynamoDB
Read/write capacity mode - Amazon DynamoDB
NEW QUESTION # 711
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