EC2 and Load Balancing

Question 1

A web application must run on EC2 instances that can be interrupted without affecting operation, but needs to keep costs low. The team has determined they can tolerate interruptions with 2-minute notice. Which EC2 instance type should the architect use?

Accepted Answer

Spot Instances

Answer

On-Demand Instances

Answer

Reserved Instances

Answer

Dedicated Hosts

Question 2

A company runs a critical application that requires high availability and must distribute traffic across multiple EC2 instances in different availability zones. The application uses HTTP/HTTPS and needs URL path-based routing. Which Load Balancer type should the architect implement?

Accepted Answer

Application Load Balancer (ALB)

Answer

Classic Load Balancer (CLB)

Answer

Network Load Balancer (NLB)

Answer

Gateway Load Balancer (GWLB)

Question 3

An architect designs a solution for an application experiencing unpredictable traffic spikes. They need the number of EC2 instances to adjust automatically based on CPU utilization. Which features should be configured in Auto Scaling? (Select TWO)

Accepted Answer

Answer

Launch Template or Launch Configuration

Answer

Target Tracking Scaling Policy based on CPU

Answer

Elastic IP for each instance

Answer

Cluster Placement Groups

Answer

Dedicated Hosts

Question 4

A financial application requires ultra-low latency (sub-millisecond) and must handle millions of requests per second with static IP addresses for client whitelisting. Which Load Balancer type is most appropriate?

Accepted Answer

Network Load Balancer

Answer

Application Load Balancer with static IPs

Answer

Classic Load Balancer with Elastic IPs

Answer

Gateway Load Balancer

Question 5

A company needs to run EC2 instances with software that has licenses tied to physical server sockets and cores. Which EC2 tenancy option should be used to meet licensing requirements?

Accepted Answer

Dedicated Hosts

Answer

Shared Tenancy (default)

Answer

Dedicated Instances

Answer

Spot Instances

Question 6

An architect designs a high-performance computing (HPC) application requiring extremely low network latency communication between EC2 instances. Which placement strategy should be implemented?

Accepted Answer

Cluster Placement Group

Answer

Spread Placement Group

Answer

Partition Placement Group

Answer

Multi-AZ Auto Scaling Group

Question 7

An application requires high-speed temporary storage directly attached to EC2 instances that will be destroyed when the instance stops. Data doesn't need persistence. Which storage type is most appropriate?

Accepted Answer

Instance Store (Ephemeral)

Answer

EBS gp3 volumes

Answer

EFS File System

Answer

S3 Standard

Question 8

A web application experiences predictable traffic spikes every day at 9 AM and 6 PM. The architect wants to ensure sufficient capacity before these spikes without over-provisioning. Which Auto Scaling policy type is most appropriate?

Accepted Answer

Scheduled Scaling Policy

Answer

Target Tracking Scaling Policy

Answer

Step Scaling Policy

Answer

Simple Scaling Policy

Question 9

An architect must ensure EC2 instances in an Auto Scaling Group are evenly distributed across 3 availability zones to maximize availability. Which ASG features should be configured? (Select TWO)

Accepted Answer

Answer

Configure multiple subnets (one per AZ) in the ASG

Answer

Enable Cross-Zone Load Balancing on ALB

Answer

Use Cluster Placement Group

Answer

Configure Health Checks with ALB

Answer

Use Dedicated Instances

Question 10

An application has stable and predictable workload that will run continuously for the next 3 years. Which EC2 purchasing model provides the greatest cost savings?

Accepted Answer

Standard Reserved Instances (3 years, All Upfront)

Answer

On-Demand Instances

Answer

Spot Instances

Answer

Convertible Reserved Instances (1 year, No Upfront)