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What does it mean if you have zero IOPS and a non-empty I/O queue for all EBS volumes attached to a running EC2 instance?
Correct Answer:C
This is the definition of Unavailable from the EC2 and EBS SLA.
"UnavaiIabIe" and "Unavai|abi|ity" mean... For Amazon EBS, when all of your attached volumes perform zero read write IO, with pending IO in the queue.
Reference: https://aws.amazon.com/ec2/s|a/
When thinking of AWS OpsWorks, which of the following is true?
Correct Answer:A
The stack is the core AWS OpsWorks component. It is basically a container for AWS resources—Amazon EC2 instances, Amazon RDS database instances, and so on—that have a common purpose and should
be logically managed together. You define the stack's constituents by adding one or more layers. A layer represents a set of Amazon EC2 instances that serve a particular purpose, such as serving applications or hosting a database server. An instance represents a single computing resource, such as an Amazon EC2 instance.
Reference: http://docs.aws.amazon.com/opsworks/latest/userguide/weIcome.htmI
Which status represents a failure state in AWS CIoudFormation?
Correct Answer:C
ROLLBACK_IN_PROGRESS means an UpdateStack operation failed and the stack is in the process of trying to return to the valid, pre-update state. UPDATE_COMPLETE_CLEANUP_IN_PROGRESS means an update was successful, and CIoudFormation is deleting any replaced, no longer used resources. ROLLBACK_FA|LED is not a CloudFormation state (but UPDATE_ROLLBACK_FAILED is). DELETE_COMPLETE_W|TH_ART|FACTS does not exist at all.
Reference:
http://docs.aws.amazon.com/AWSCIoudFormation/latest/UserGuide/using-cfn-updating-stacks.html
There are a number of ways to purchase compute capacity on AWS. Which orders the price per compute or memory unit from LOW to HIGH (cheapest to most expensive), on average?
(A) On-Demand (B) Spot (C) Reserved
Correct Answer:C
Spot instances are usually many, many times cheaper than on-demand prices. Reserved instances, depending on their term and utilization, can yield approximately 33% to 66% cost savings. On-Demand prices are the baseline price and are the most expensive way to purchase EC2 compute time. Reference: https://d0.awsstatic.com/whitepapers/Cost_Optimization_with_AWS.pdf
Which EBS volume type is best for high performance NoSQL cluster deployments?
Correct Answer:A
io1 volumes, or Provisioned IOPS (PIOPS) SSDs, are best for: Critical business applications that require sustained IOPS performance, or more than 10,000 IOPS or 160 MiB/s of throughput per volume, like large database workloads, such as MongoDB.
Reference: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVo|umeTypes.htm|