Review Flashcards
S3 offers 256-bit encryption for data-at-rest.
S3 offers 256-bit encryption for data-at-rest, which is an option you an turn on/off. AWS manages the keys and will decrypt the data when you request to download it.
What feature should you utilize for redundancy if auto scaling and load balancing are not available?
Setting up an Elastic IP address and having it ready for failover is a great solution when other services that provide high availability and fault tolerance are not available.
The AMI ID used in an Auto Scaling policy is configured in the
Launch configuration
Which of the following is not a benefit of a decoupled architecture using EC2, Auto Scaling, and SQS?
An application does not become unavailable due to the deletion of a single SQS queue
Deletion of an SQS queue used in an application will cause the application to fail.
you recently purchased and deployed four reserved EC2 instances in the US-East-1 region’s Availability Zone 1 for a new project. Your supervisor just informed you that this project only requires two EC2 instances. Rather than selling the reserved instances, she asked you to terminate the extra instances and convert two of the on-demand instances already running in Availability Zone 1 to reserved instances. Can this be done?
Yes, you can terminate the reserved instances and AWS will automatically begin billing the two on-demand instances as reserved instances
Data stored on EBS volumes are automatically and redundantly stored in multiple physical volumes in the same Availability Zone as part of the normal operations of the EBS service and at no additional charge.
true
Which of the following AWS services allow you access to the underlying operating system?
Amazon EMR, Amazon Elastic Beanstalk
You are building a system to distribute confidential training videos to employees. Using CloudFront, what method would be used to serve content that is stored in S3 but not publicly accessible from S3 directly?
Create an Origin Access Identify (OAI) for CloudFront and grant access to the objects in your S3 bucket to that OAI
You have 8 instances running on your VPC and all 10 of your users (5 production and 5 development) currently have access to all the instances. However, you have been told that because 4 of the instances are used for production and 4 are used for development, you will need to set up access so that the 5 production people can only access the production server and the 5 development people can only access the development server. Using policies, which of the following would be the best way to accomplish this?
Define the tags on the test and production servers, and add a condition to the IAM policy which allows access to specific tags
Amazon Auto Scaling is not meant to handle instant load spikes but is built to grow with a gradual increase in usage over a short time period.
true
You recently purchased hardware to run a decoupled application in your on-premises datacenter. The application is working great but has seen an increased workload in recent weeks that makes you concerned that your hardware cannot handle the load. Your supervisor asks you to analyze the possibility of expanding the application using cloud resources. You cannot completely migrate the application to AWS because of the investment you have already made in on-premises hardware. What items will most likely be included in your analysis?
You can leverage SQS to utilize both on-premises servers and EC2 instances for your decoupled application, You can leverage SWF to utilize both on-premises servers and EC2 instances for your decoupled application
When designing an application architecture utilizing EC2 instances and the ELB, to determine the instance size required for your application, what questions might be important?
Determining the minimum memory requirements for an application, Determining the required I/O operations
Stripping Options
Raid 0 and 1(common type); Raid 5 and 6(not recommended because of the extended stipe
Raid 0 Disadvantage
Performance of the stripe is limited to the worst performing volume in the set.. Loss of a single volume results in a complete data loss of the array
Raid 1 Disadvantage
Does not provide a write performance improvement; requires more Amazon RC2 to Amazon EBS bandwidth than non-RAID configurations because the data is written to multiple volumes simultaneously.
Raid 5 and Raid 6
are not recommedned for amazon EBS because the parity write operations of these RAID modes consume some of the IOPS available to your volumes.. Increased cost.
Is creating a Read replica of another read replica supported?
only with MySQL based RDS
If I want my instance to run on a single-tenant hardware, which value do I have to set the instance’s tenancy attribute to?
Dedicated.
maximum response time for a Business level Premium Support case?
1 hour
Sharding
Sharding embodies the “share-nothing” architecture and essentially just involves breaking a
larger database up into smaller databases. Common ways to split a database are:
Splitting tables that are not joined in the same query onto different hosts Duplicating a table across multiple hosts and then splitting where a row goes.
Enhanced Networking – launch HVM AMI in VPC.
Enhanced Networking enables you to get significantly higher packet per second (PPS) performance, lower network jitter and lower latencies. This feature uses a new network virtualization stack that provides higher I/O performance and lower CPU utilization compared to traditional implementations. In order to take advantage of Enhanced Networking, you should launch an HVM AMI in VPC, and install the appropriate driver.
Improve Application Throughput
You can run and scale applications such as stateless web services, image rendering, big data analytics and massively parallel computations on Spot instances. Since it costs less , you can increase your compute capacity by 2-10x within the same budget.
I2
Optimized to deliver tens of thousands of low-latency, randon I.O operations per second to applications.
NoSQl, Clustered databases, Online transaction processing(OLTP) systems
Billing dashboard elements
Bills; cost Explorer; Budgets; Reports; Cost Allocation Tags; Payment Methods; Payment History; Consolidated Billing; Preferences; Credits; Tax Settings; DevPay