Day 5: EC2 p3

Your web application needs 4 instances to support steady traffic nearly all of the time. On the weekend, the traffic triples. What is a cost-effective way to handle this?

• Run 12 Reserved Instances all of the time.
• Run 4 On-Demand Instances constantly, then add 8 more On-Demand Instances on the weekend
• Run 4 Reserved Instances constantly, then add 8 On-Demand Instances on the weekend
• Run 12 Spot Instances all of the time.
• Run 4 Spot Instances constantly, then add 8 Reserved Instances on the weekend

___ allows an instance to communicate with other network resources, including AWS services, other instances, on-premises servers, and the Internet

• AMI
• ENI
• Security Groups
• IAM Roles

___ Placement groups strategy typically used by large distributed and replicated workloads, such as Hadoop, Cassandra, and Kafka.

• Cluster
• Partition
• Spread

___ placement groups are recommended for applications that have a small number of critical instances that should be kept separate from each other.

• Cluster
• Partition
• Spread

While set up spread level placement groups, you can put maximum ___ instances in an AZ

• 3
• 4
• 5
• 6
• 7

Which is true regarding an elastic network interface?

• It must have a private IP address from the subnet that it resides in.
• It cannot exist independently of an instance
• It can be connected to multiple subnets.
• It can have multiple IP addresses from different subnets

Which of the following statements is true of security groups?

• A security group can only be attached to an EC2 instance
• A security group must be attached to an EC2 instance
• An EC2 instance must have at least a security group
• An EC2 instance don't have to attach any security group

An application launching on a EC2 instance which only needs to run 12 hours daily. You want to save cost by making the instance unavailable outside that time but still memory must be preserved. What should you do ?

• Stop the instance outside that time. Start up it again when required.
• Hibernate the instance outside that time. Start up it again when required.
• Terminate the instance outside that time. Launch it again when required.
• Reboot the instance outside that time

Your instance is associated with two security groups. The first one allows Remote Desktop Protocol (RDP) access from 72.14.0.0/16. and the second allows HTTP access from 0.0.0.0/0

• RDP and HTTP access from anywhere
• RDP and HTTP traffic from 72.14.0.0/16
• RDP traffic over port 3389 from 72.14.0.0/16 and HTTP traffic over port 80 from anywhere
• RDP traffic over port 80 from 72.14.0.0/16 and HTTP traffic over port 3389 from anywhere
• None of above

Which of the following can be used to access EC2 instance over the web (choose 2)

• Private IP
• Public IP
• DNS name
• Instance ID
• AMI