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AWS Certified Solutions Architect – Associate Questions and Answers (Dumps and Practice Questions)



Question : You are designing a web application that stores static assets in an Amazon Simple Storage
Service (S3) bucket. You expect this bucket to immediately receive over 150 PUT requests
per second. What should you do to ensure optimal performance?
: You are designing a web application that stores static assets in an Amazon Simple Storage
1. Use multi-part upload.
2. Add a random prefix to the key names.
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4. Use a predictable naming scheme, such as sequential numbers or date time sequences, in the key names

Ans : 2
Exp : The sequence pattern in the key names introduces a performance problem. To understand the issue, let,s look at how Amazon S3 stores key names.

Amazon S3 maintains an index of object key names in each AWS region. Object keys are stored lexicographically across multiple partitions in the index. That
is, Amazon S3 stores key names in alphabetical order. The key name dictates which partition the key is stored in. Using a sequential prefix, such as
timestamp or an alphabetical sequence, increases the likelihood that Amazon S3 will target a specific partition for a large number of your keys,
overwhelming the I/O capacity of the partition. If you introduce some randomness in your key name prefixes, the key names, and therefore the I/O load, will
be distributed across more than one partition.

If you anticipate that your workload will consistently exceed 100 requests per second, you should avoid sequential key names. If you must use sequential
numbers or date and time patterns in key names, add a random prefix to the key name. The randomness of the prefix more evenly distributes key names across
multiple index partitions. Examples of introducing randomness are provided later in this topic.

Note
The guidelines provided for the key name prefixes in the following section also apply to the bucket name. When Amazon S3 stores a key name in the index, it
stores the bucket names as part of the key name (for example, examplebucket/object.jpg).
Example 1: Add a Hex Hash Prefix to Key Name

One way to introduce randomness to key names is to add a hash string as prefix to the key name. For example, you can compute an MD5 hash of the character
sequence that you plan to assign as the key name. From the hash, pick a specific number of characters, and add them as the prefix to the key name. The
following example shows key names with a four-character hash.

If you anticipate that your workload will consistently exceed 100 requests per second, you should avoid sequential key names. If you must use sequential
numbers or date and time patterns in key names, add a random prefix to the key name. The randomness of the prefix more evenly distributes key names across
multiple index partitions. Examples of introducing randomness are provided later in this topic.



Question : You have a load balancer configured for VPC, and all back-end Amazon EC instances are
in service. However, your web browser times out when connecting to the load balancer's
DNS name. Which options are probable causes of this behavior? Choose 2 answers
A. The load balancer was not configured to use a public subnet with an Internet gateway configured
B. The Amazon EC2 instances do not have a dynamically allocated private IP address
C. The security groups or network ACLs are not property configured for web traffic.
D. The load balancer is not configured in a private subnet with a NAT instance.
E. The VPC does not have a VGW configured.
: You are designing a web application that stores static assets in an Amazon Simple Storage
1. A,B
2. B,C
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4. D,E

Ans: 1




Question : A company needs to deploy services to an AWS region which they have not previously
used. The company currently has an AWS identity and Access Management (IAM) role for
the Amazon EC2 instances, which permits the instance to have access to Amazon
DynamoDB. The company wants their EC2 instances in the new region to have the same
privileges. How should the company achieve this?
: You are designing a web application that stores static assets in an Amazon Simple Storage
1. Create a new IAM role and associated policies within the new region
2. Assign the existing IAM role to the Amazon EC2 instances in the new region
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4. Create an Amazon Machine Image (AMI) of the instance and copy it to the desired region using the AMI Copy feature
Ans : 2



Question : How can an EBS volume that is currently attached to an EC instance be migrated from one Availability Zone to another?

: You are designing a web application that stores static assets in an Amazon Simple Storage
1. Detach the volume and attach it to another EC2 instance in the other AZ.
2. Simply create a new volume in the other AZ and specify the original volume as the source.
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4. Detach the volume, then use the ec2-migrate-voiume command to move it to another AZ

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Question : You are using an m.small EC Instance with one GB EBS volume to host a relational database.
You determined that write throughput to the database needs to be increased. Which of the following approaches can help achieve this? Choose 2 answers
A. Use an array of EBS volumes.
B. Enable Multi-AZ mode.
C. Place the instance in an Auto Scaling Groups
D. Add an EBS volume and place into RAID 5.
E. Increase the size of the EC2 Instance.
F. Put the database behind an Elastic Load Balancer.

: You are using an m.small EC Instance with one GB EBS volume to host a relational database.
1. A,E
2. B,C
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4. D,E

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Explanation: RAID 5 and RAID 6 are not recommended for Amazon EBS because the parity write operations of these RAID modes consume some of the IOPS available to
your volumes. Depending on the configuration of your RAID array, these RAID modes provide 20-30% fewer usable IOPS than a RAID 0 configuration. Increased
cost is a factor with these RAID modes as well; when using identical volume sizes and speeds, a 2-volume RAID 0 array can outperform a 4-volume RAID 6 array
that costs twice as much.




Question : You have an EC security group with several EC instances running inside it. You change the security group rules to allow inbound traffic on
port 443 and you then
launch several new instances in the same security group. The new rules apply:

: You have an EC security group with several EC instances running inside it. You change the security group rules to allow inbound traffic on
1. Straight Away but to the new instances only.
2. Straight away to all instances within the security group.
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4. Straight Away to the new instances, but old instances must be stopped and restarted before the new rules apply.



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Explanation: Is it possible to move an instance from one security group to another?
No, it is not. The security group for an instance is set at launch time and can not be changed.
You have two options:
1. modify the settings for the current security group - which will affect all instances running in the specific group
2. launch a new instance in the second security group and terminate the old instance in the first security group





Related Questions

Question : Restarting an instance in AWS VPC, retains the same primary private IP address ?
 : Restarting an instance in AWS VPC, retains the same primary private IP address ?
1. Yes, It keeps the same primary private IP address
2. No, It does not keep the same primary private IP address
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4. None of the above is correct



Question : Which one of the following you create, will automatically a set of DHCP options is automatically added and associated with it

 : Which one of the following you create, will automatically a set of DHCP options is automatically added and associated with it
1. RDS (Relational Database Service)
2. EC2 (Elastic Cloud)
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4. VPC (Virtual Private cloud)


Question : For the CloudFormation once you have been created the resources, which one of the following you can use to identify resources
outside of AWS CloudFormation templates,
: For the CloudFormation once you have been created the resources, which one of the following you can use to identify resources
1. Template
2. Stack ID
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4. Logical IDs


Question : What happens when you create a topic on Amazon SNS?
 : What happens when you create a topic on Amazon SNS?
1. An ARN (Amazon Resource Name) is created,which will include the service name (SNS), region, AWS ID
2. You can create a topic only on Amazon SQS.
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4. None of the above


Question : Which one of the following can be done by the Publisher on the Amazon SNS.

 : Which one of the following can be done by the Publisher on the Amazon SNS.
1. Publish: Publish a new message to the topic.
2. ListTopics List of topics owned by a particular user (AWS ID).
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4. All 1,2 and 3
5. Only 1 and 2


Question : What are the different delivery formats/transports for receiving notifications in SNS?
 : What are the different delivery formats/transports for receiving notifications in SNS?
1. HTTP, HTTPS Subscribers specify a URL as part of the subscription registration; notifications will be delivered through an HTTP POST to the
specified URL.
2. Email, Email JSON Messages are sent to registered addresses as email. Email-JSON sends notifications as a JSON object, while Email sends
text-based email.
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4. SMS Messages are sent to registered phone numbers as SMS text messages
5. All of the above