Network ACLs are _______.
B
Network ACLs are stateless; responses to allowed inbound traffic are subject to the rules for out-bound traffic (and vice versa).
Reference:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_ACLs.html
Is it possible to publish your own metrics to CloudWatch?
D
You can publish your own metrics to CloudWatch using the AWS CLI or an API. You can view statistical graphs of your published metrics with the AWS
Management Console. CloudWatch stores data about a metric as a series of data points. Each data point has an associated time stamp. You can even publish an aggregated set of data points called a statistic set.
Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/publishingMetrics.html
Can you use CloudWatch to monitor memory and disk utilization usage for your Amazon EC2 Linux instances?
C
Using the Cloudwatch Monitoring scripts for Linux, you can measure memory and disk usage of your Linux EC2 instances.
Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/mon-scripts.html
An Auto Scaling group is running at the desired capacity of 5 instances and receives a trigger from the Cloudwatch Alarm to increase the capacity by 1. The cool down period is 5 minutes.
Cloudwatch sends another trigger after 2 minutes to decrease the desired capacity by 1. What will be the count of instances at the end of 4 minutes?
B
The cool down period is the time difference between the end of one scaling activity (can be start or terminate) and the start of another one (can be start or terminate). During the cool down period, Au-to Scaling does not allow the desired capacity of the Auto Scaling group to be changed by any other CloudWatch alarm. Thus, in this case the trigger from the second alarm will have no effect.
Reference:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AS_Concepts.html#healthcheck
An instance has enabled basic monitoring only for CloudWatch. What is the minimum time period available for basic monitoring?
C
When a user is setting up an alarm on the EC2 instance metric, the time period should be equal to or more than the metric frequency. For basic monitoring, the metric is monitored at every 5 minutes (300 seconds).
Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_MetricDatum.html
Which of the following statements describes launch configuration in Auto Scaling?
A
A launch configuration represents a template that the Auto Scaling group uses to launch the Ama-zon EC2 instances. When you create a launch configuration, you specify information for the in-stances such as the ID of the Amazon Machine Image (AMI), the instance type, a key pair, one or more security groups, and a block device mapping.
Reference:
http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/LaunchConfiguration.html
A user is collecting 1000 records per second. The user wants to send the data to CloudWatch using a custom namespace. Which of the below mentioned options is recommended for this activi-ty?
B
AWS CloudWatch supports the custom metrics. The user can always capture the custom data and upload the data to CloudWatch using CLI or APIs. The user can publish data to CloudWatch as single data points or as an aggregated set of data points called a statistic set using the command put-metric-data. It is recommended that when the user is having multiple data points per minute, he should aggregate the data so that it will minimize the number of calls to put-metric- data. In this case it will be single call to CloudWatch instead of 1000 calls if the data is aggregated.
Reference:
http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/publishingMetrics.html
Amazon RDS provides Amazon CloudWatch metrics for your DB Instance deployments at no ad-ditional charge. You can use the AWS Management Console to view key operational metrics for your DB Instance deployments, including ____.
D
Amazon RDS provides Amazon CloudWatch metrics for you DB Instance deployments at no addi-tional charge. You can use the AWS Management Console to view key operational metrics for your DB Instance deployments, including compute/memory/storage capacity utilization, I/O activity, and DB Instance connections.
Reference:
https://aws.amazon.com/rds/postgresql/
A custom network ACL that you create ____ until you add rules, and is not associated with a sub-net until you explicitly associate it with one.
D
You can create a custom network ACL for your VPC. By default, a network ACL that you create blocks all inbound and outbound traffic until you add rules, and is not associated with a subnet until you explicitly associate it with one.
The default NACL that is created with your VPC allows all inbound and outbound traffic by de-fault.
Reference:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_ACLs.html#CreateACL
What does Amazon ELB stand for?
A
Amazon ELB stands for Elastic Load Balancing. Elastic Load Balancing distributes incoming appli-cation traffic across multiple EC2 instances, in multiple
Availability Zones. This increases the fault tolerance of your applications.
Reference:
http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/SvcIntro.html
