A Web Company Is Looking to Implement an External Payment

question 782

Multiple Choice

A web company is looking to implement an external payment service into their highly available application deployed in a VPC Their application EC2 instances are behind a public facing ELB. Auto scaling is used to add additional instances as traffic increases under normal load the application runs 2 instances in the Auto Scaling group but at peak it can scale 3x in size. The application instances need to communicate with the payment service over the Internet which requires whitelisting of all public IP addresses used to communicate with it. A maximum of 4 whitelisting IP addresses are allowed at a time and can be added through an API. How should they architect their solution?

• A) Route payment requests through two NAT instances setup for High Availability and whitelist the Elastic IP addresses attached to the MAT instances.
• B) Whitelist the VPC Internet Gateway Public IP and route payment requests through the Internet Gateway.
• C) Whitelist the ELB IP addresses and route payment requests from the Application servers through the ELB.
• D) Automatically assign public IP addresses to the application instances in the Auto Scaling group and run a script on boot that adds each instances public IP address to the payment validation whitelist API.

Analyze the impact of adjusting entries on the balance of prepaid accounts prior to adjustment.

Calculate the adjusted balances for accounts affected by the entries.

Understand the concept of book value and its calculation.

Recognize the accounting treatment of unearned revenues and its adjustment.

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Definitions:

Product Invention

The process of creating new products or significantly improving existing ones to meet consumer needs or market niches.

Communication Adaptation Strategy

A method used by companies to adjust their marketing messages and communication tactics to accommodate cultural or regional differences within target markets.

Dual Adaptation Strategy

A marketing approach where both the product and the marketing messages are adapted to suit the needs and preferences of different market segments or regions.

Product Extension Strategy

A marketing strategy in which a company introduces additional items in the same product category under the same brand name, such as new flavors, forms, colors, added ingredients, or package sizes.