Your Company Has an On-Premises Multi-Tier PHP Web Application, Which

question 498

Multiple Choice

Your company has an on-premises multi-tier PHP web application, which recently experienced downtime due to a large burst in web traffic due to a company announcement   Over the coming days, you are expecting similar announcements to drive similar unpredictable bursts, and are looking to find ways to quickly improve your infrastructures ability to handle unexpected increases in traffic. The application currently consists of 2 tiers a web tier which consists of a load balancer and several Linux Apache web servers as well as a database tier which hosts a Linux server hosting a MySQL database. Which scenario below will provide full site functionality, while helping to improve the ability of your application in the short timeframe required?

• A) Failover environment: Create an S3 bucket and configure it for website hosting. Migrate your DNS to Route53 using zone file import, and leverage Route53 DNS failover to failover to the S3 hosted website.
• B) Hybrid environment: Create an AMI, which can be used to launch web servers in EC2. Create an Auto Scaling group, which uses the AMI to scale the web tier based on incoming traffic. Leverage Elastic Load Balancing to balance traffic between on-premises web servers and those hosted in AWS.
• C) Offload traffic from on-premises environment: Setup a CIoudFront distribution, and configure CloudFront to cache objects from a custom origin. Choose to customize your object cache behavior, and select a TTL that objects should exist in cache.
• D) Migrate to AWS: Use VM Import/Export to quickly convert an on-premises web server to an AMI. Create an Auto Scaling group, which uses the imported AMI to scale the web tier based on incoming traffic. Create an RDS read replica and setup replication between the RDS instance and on-premises MySQL server to migrate the database.

---

Definitions:

Nonparametric Method

Statistical methods that do not rely on data belonging to any particular distribution, often used when data doesn't meet the assumptions of parametric tests.

Matched Pairs

A study design in which participants are paired based on specific characteristics, ensuring that each pair is as similar as possible except for the variable being tested.

Ordinal Data

A type of categorical data where the categories have a natural, ordered relationship.

Wilcoxon Rank Sum Test

A nonparametric test that compares two unrelated samples to determine if there is a difference in their central tendency.