AWS Certified SysOps Administrator - Associate Questions and Answers (Dumps and Practice Questions)
Question : You have an application running on Amazon Web Services. The application has EC instances in availability zone us-east-c.
You re using Elastic Load Balancer to load balance traffic across your four instances.
What changes would you make to create a fault tolerant architecture? Select the "best" possible answer.
1. Create EBS backups to ensure data is not lost.
2. Move all 4 instances to a different availability zone.
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4. None of the above
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Explanation: Elastic Load Balancing automatically distributes incoming application traffic across multiple Amazon Elastic Compute Cloud (Amazon EC2) instances. You can set up an elastic
load balancer to load balance incoming application traffic across Amazon EC2 instances in a single Availability Zone or multiple Availability Zones. Elastic Load Balancing enables
you to achieve even greater fault tolerance in your applications, plus it seamlessly provides the amount of load balancing capacity that is needed in response to incoming application
traffic.
You can build fault tolerant applications by placing your Amazon EC2 instances in multiple Availability Zones. To achieve even more fault tolerance with less manual intervention, you
can use Elastic Load Balancing. When you place your compute instances behind an elastic load balancer, you improve fault tolerance because the load balancer can automatically balance
traffic across multiple instances and multiple Availability Zones. This ensures that only healthy EC2 instances receive traffic.
Elastic Load Balancing also detects the health of EC2 instances. When it detects unhealthy Amazon EC2 instances, it no longer routes traffic to them. Instead, it spreads the load
across the remaining healthy EC2 instances. If you have set up your EC2 instances in multiple Availability Zones, and all of your EC2 instances in one Availability Zone become
unhealthy, Elastic Load Balancing will route traffic to your healthy EC2 instances in those other zones. When the unhealthy EC2 instances have been restored to a healthy state
Elastic Load Balancing will resume load balancing to those instances. Additionally, Elastic Load Balancing is itself a distributed system that is fault tolerant and actively
monitored.
Elastic Load Balancing also offers integration with Auto Scaling, which ensures that you have the back-end capacity available to meet varying traffic levels. Let's say that you want
to make sure that the number of healthy EC2 instances behind an Elastic Load Balancer is never fewer than two. You can use Auto Scaling to set these conditions, and when Auto Scaling
detects that a condition has been met, it automatically adds the requisite amount of EC2 instances to your Auto Scaling Group. Here's another example: If you want to make sure to add
EC2 instances when the latency of any one of your instances exceeds 4 seconds over any 15 minute period, you can set that condition. Auto Scaling will take the appropriate action on
your EC2 instances, even when running behind an Elastic Load Balancer. Auto Scaling works equally well for scaling EC2 instances whether you're using Elastic Load Balancing or not.
One of the major benefits of Elastic Load Balancing is that it abstracts out the complexity of managing, maintaining, and scaling load balancers. The service is designed to
automatically add and remove capacity as needed, without needing any manual intervention.
Question : You ve created a production architecture on AWS. It consists of load balancer, route domain, Amazon S buckets,
auto scaling policy, and Amazon CloudFront for content delivery. Your boss asks you for the ability to duplicate this architecture
by using a JSON based template. What AWS service would you use?
1. Amazon DynamoDB
2. Amazon SimpleDB
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4. Amazon Bootstrap
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Exp: AWS CloudFormation gives developers and systems administrators an easy way to create and manage a collection of related AWS resources, provisioning and updating them in an
orderly and predictable fashion.
You can use AWS CloudFormations sample templates or create your own templates to describe the AWS resources, and any associated dependencies or runtime parameters, required to run
your application. You dont need to figure out the order for provisioning AWS services or the subtleties of making those dependencies work. CloudFormation takes care of this for you.
After the AWS resources are deployed, you can modify and update them in a controlled and predictable way, in effect applying version control to your AWS infrastructure the same way
you do with your software.
You can deploy and update a template and its associated collection of resources (called a stack) by using the AWS Management Console, AWS Command Line Interface, or APIs.
CloudFormation is available at no additional charge, and you pay only for the AWS resources needed to run your applications.
Question : Amazon SWF provides consistent execution.
1. True
2. False
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Explanation: The progress of every workflow execution is recorded in its workflow history, which Amazon SWF maintains. The workflow history is a detailed, complete, and consistent record of
every event that occurred since the workflow execution started. An event represents a discrete change in your workflow execution's state, such as a new activity being scheduled or a
running activity being completed. The workflow history contains every event that causes the execution state of the workflow execution to change, such as scheduled and completed
activities, task timeouts, and signals.
Operations that do not change the state of the workflow execution do not typically appear in the workflow history. For example, the workflow history does not show poll attempts or
the use of visibility operations.
The workflow history has several key benefits:
It enables applications to be stateless, because all information about a workflow execution is stored in its workflow history.
For each workflow execution, the history provides a record of which activities were scheduled, their current status, and their results. The workflow execution uses this information
to determine next steps.
The history provides a detailed audit trail that you can use to monitor running workflow executions and verify completed workflow executions.
Related Questions
Question : A user runs the command "dd if=/dev/zero of=/dev/xvdfbs=M" on a fresh blank EBS volume attached to a Linux instance. Which of the below
mentioned activities is the user performing with the command given above?
1. Creating a file system on the EBS volume
2. Mounting the device to the instance
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4. Formatting the EBS volume
Question : A user has created an Auto Scaling group using CLI. The user wants to enable CloudWatch detailed
monitoring for that group. How can the user configure this?
1. When the user sets an alarm on the Auto Scaling group, it automatically enables detail monitoring
2. By default detailed monitoring is enabled for Auto Scaling
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4. Enable detail monitoring from the AWS console
Question : A user has created a VPC with a public subnet. The user has terminated all the instances which are part of the subnet. Which of the below
mentioned statements is true with respect to this scenario?
1. The user cannot delete the VPC since the subnet is not deleted
2. All network interface attached with the instances will be deleted
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4. The subnet to which the instances were launched with will be deleted
Question : A user has configured ELB with SSL using a security policy for secure negotiation between the client and load balancer. The ELB security policy
supports various ciphers. Which of the below mentioned options helps identify the matching cipher at the client side to the ELB cipher list when
client is requesting ELB DNS over SSL?
1. Cipher Protocol
2. Client Configuration Preference
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4. Load Balancer Preference
Question : A user has created a VPC with public and private subnets. The VPC has CIDR .../. The private subnet uses CIDR .../ and the
public subnet uses CIDR 20.0.0.0/24. The user is planning to host a web server in the public subnet port 80. and a DB server in the private
subnet port 3306.. The user is configuring a security group of the NAT instance. Which of the below mentioned entries is not required for the NAT security group?
1. For Inbound allow Source: 20.0.1.0/24 on port 80
2. For Outbound allow Destination: 0.0.0.0/0 on port 80
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4. For Outbound allow Destination: 0.0.0.0/0 on port 443
Question : A user has created an application which will be hosted on EC. The application makes calls to DynamoDB to fetch certain data. The application is
using the DynamoDB SDK to connect with from the EC2 instance. Which of the below mentioned statements is true with respect to the best
practice for security in this scenario?
1. The user should attach an IAM role with DynamoDB access to the EC2 instance
2. The user should create an IAM user with DynamoDB access and use its credentials within the application to connect with DynamoDB
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4. The user should create an IAM user with DynamoDB and EC2 access. Attach the user with the application so that it does not use the root
account credentials