B.

ELB health check

The admin can capture information about Elastic Load Balancer using either:
CloudWatch Metrics ELB Logs files which are stored in the S3 bucket CloudTrail with API
calls which can notify the user as well generate logs for each API calls The health check is
internally performed by ELB and does not help the admin get the ELB activity.

A.

20.0.0.255

When the user creates a subnet in VPC, he specifies the CIDR block for the subnet. In this
case the user has created a VPC with the CIDR block 20.0.0.0/24, which supports 256 IP
addresses (20.0.0.0 to 20.0.0.255.. The public subnet will have IP addresses between
20.0.0.0 - 20.0.0.127 and the private subnet will have IP addresses between 20.0.0.128 -
20.0.0.255. AWS reserves the first four IP addresses and the last IP address in each
subnet’s CIDR block. These are not available for the user to use. Thus, the instance cannot
have an IP address of 20.0.0.255

D.

Create a new Launch Config with detail monitoring enabled and update the Auto Scaling
group

CloudWatch is used to monitor AWS as well as the custom services. To enable detailed
instance monitoring for a new Auto Scaling group, the user does not need to take any extra
steps. When the user creates the AutoScaling launch config as the first step for creating an
Auto Scaling group, each launch configuration contains a flag named
InstanceMonitoring.Enabled. The default value of this flag is true. When the user has
created a launch configuration with InstanceMonitoring.Enabled = false it will involve
multiple steps to enable detail monitoring. The steps are:
Create a new Launch config with detailed monitoring enabled
Update the Auto Scaling group with a new launch config
Enable detail monitoring on each EC2 instance

A.

The ratio between IOPS and the EBS volume is higher than 30

A provisioned IOPS EBS volume can range in size from 10 GB to 1 TB and the user can provision up to 4000 IOPS per volume. The ratio of IOPS provisioned to the volume size requested should be a maximum of 30; for example, a volume with 3000 IOPS must be at least 100 GB.

A.

The user can use the copy URL functionality of CloudWatch to share the exact details

Amazon CloudWatch provides the functionality to graph the metric data generated either by
the AWS services or the custom metric to make it easier for the user to analyse. The
console provides the option to save the URL or bookmark it so that it can be used in the
future by typing the same URL. The Copy URL functionality is available under the console
when the user selects any metric to view.

A.

The internet gateway is not configured with the route table

A Virtual Private Cloud (VPC. is a virtual network dedicated to the user’s AWS account.
AWS provides two features the user can use to increase security in VPC: security groups
and network ACLs. Security groups work at the instance level. When a user launches an
instance and wants to connect to an instance, he needs an internet gateway. The internet
gateway should be configured with the route table to allow traffic from the internet.

A.

Route 53

The user can provide high availability and redundancy for applications running behind
Elastic Load Balancer by enabling the Amazon Route 53 Domain Name System (DNS.
failover for the load balancers. Amazon Route 53 is a DNS service that provides reliable
routing to the user’s infrastructure.

D.

Create another EBS volume in the second Availability Zone attach it to the Amazon EC2
instance, and use a disk manager to mirror me two disks

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-creating-snapshot.html