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ACPL Systems Interview Questions and Answers
Ques:- What is OAuth and how does it work in API authentication
Right Answer:
OAuth is an open standard for access delegation commonly used for token-based authentication and authorization. It allows third-party applications to access a user's resources without sharing their credentials.

In API authentication, OAuth works by having the user authorize the application to access their data. The process involves:

1. The user is redirected to an authorization server to log in and grant permission.
2. The authorization server issues an access token to the application.
3. The application uses this access token to make API requests on behalf of the user.
4. The API validates the token and grants access to the requested resources.
Ques:- What is API authentication and what are common methods
Right Answer:
API authentication is the process of verifying the identity of a user or application trying to access an API. Common methods include:

1. **API Keys**: Unique keys provided to users to access the API.
2. **Basic Authentication**: Uses a username and password encoded in Base64.
3. **OAuth**: A token-based authentication method that allows users to grant limited access to their resources without sharing credentials.
4. **JWT (JSON Web Tokens)**: A compact, URL-safe means of representing claims to be transferred between two parties, often used for stateless authentication.
5. **HMAC (Hash-based Message Authentication Code)**: Uses a secret key to create a hash of the request, ensuring data integrity and authenticity.
Ques:- What is API documentation and why is it necessary
Right Answer:
API documentation is a technical manual that explains how to use an API, including its endpoints, request and response formats, authentication methods, and examples. It is necessary because it helps developers understand how to integrate and interact with the API effectively, ensuring proper usage and reducing errors.
Ques:- What is API versioning and why is it important
Right Answer:
API versioning is the practice of managing changes to an API by assigning version numbers to different iterations of the API. It is important because it allows developers to introduce new features or make changes without breaking existing client applications that rely on older versions, ensuring backward compatibility and a smoother transition for users.
Ques:- What is the difference between GET, POST, PUT, and DELETE in HTTP
Right Answer:
GET is used to retrieve data from a server, POST is used to send data to a server to create a resource, PUT is used to update an existing resource on the server, and DELETE is used to remove a resource from the server.
Ques:- What is n tier ?
Right Answer:
N-tier architecture is a software architecture model that separates an application into multiple layers or tiers, typically including presentation, application logic, and data storage. Each tier is independent and can communicate with others over a network, allowing for better scalability, maintainability, and separation of concerns.
Ques:- What are the steps for desinig s/w project?
Right Answer:
1. Define project goals and objectives.
2. Gather and analyze requirements.
3. Create a high-level architecture and design.
4. Develop a detailed design specification.
5. Plan the project timeline and resources.
6. Implement the design through coding.
7. Conduct testing and quality assurance.
8. Deploy the application.
9. Monitor and maintain the software post-deployment.
Ques:- Please explain 3-tier architecture?
Right Answer:
3-tier architecture is a software design pattern that separates an application into three layers:

1. **Presentation Layer**: This is the user interface where users interact with the application.
2. **Application Layer (Business Logic Layer)**: This layer processes user inputs, applies business rules, and communicates between the presentation and data layers.
3. **Data Layer**: This layer manages data storage and retrieval, typically involving a database.

Each layer is independent, allowing for easier maintenance and scalability.
Ques:- How does the Internet work?
Right Answer:
The Internet works by connecting millions of computers and devices through a network of servers, routers, and cables. Data is transmitted in small packets using protocols like TCP/IP, allowing devices to communicate and share information across the globe.
Ques:- What is a managed code.Is 'Dim fs as filestreamobject' is a managed code?
Right Answer:
Managed code is code that is executed by the .NET runtime (CLR), which provides services like garbage collection and type safety. The statement 'Dim fs as FileStream' is managed code because it is written in a .NET language and runs under the control of the CLR.
Ques:- A travel agency makes a 10% commission on all of its travel bookings. Their current profit before taxes is $1MM, while the industry average ranges from $2MM to $3.5MM. Why are they making less than the industry average?
Right Answer:
The travel agency may be making less than the industry average due to factors such as higher operational costs, lower sales volume, less effective marketing strategies, or offering less competitive pricing compared to other agencies.
Ques:- If I gave you a billion dollars, what would you do with it?
Right Answer:
I would invest a significant portion in diverse assets for long-term growth, allocate funds for philanthropic initiatives to address social issues, and set aside some for personal and family needs.
Ques:- Our client is a retailer of fine and expensive oriental rugs in Manhattan. They are experiencing declining profits. Why and what can they do about it?
Right Answer:
The declining profits could be due to increased competition, changing consumer preferences, or high operational costs. To address this, the client can:

1. Enhance online presence and e-commerce capabilities to reach a broader audience.
2. Offer promotions or loyalty programs to attract and retain customers.
3. Diversify product offerings, such as introducing lower-priced options or complementary home decor items.
4. Improve customer experience through personalized service and in-store events.
5. Analyze and reduce operational costs without compromising quality.
Ques:- A company manufactures hair products. It’s thinking about entering the sunscreen market. Is this a good idea?
Right Answer:
It could be a good idea if there is market demand, the company can leverage its existing distribution channels, and it has the resources to develop and market sunscreen products effectively. However, thorough market research and analysis of competition and consumer preferences are essential before making a decision.
Ques:- What can we do more to improve relations with our customers?
Right Answer:
To improve relations with our customers, we can enhance communication by actively listening to their feedback, providing personalized support, and regularly checking in to understand their needs. Additionally, we can offer loyalty programs, ensure timely responses to inquiries, and create opportunities for customer engagement through events or surveys.
Ques:- What is a project charter?
Right Answer:
A project charter is a formal document that outlines the objectives, scope, stakeholders, and overall framework of a project. It serves as an official authorization for the project to begin and provides a high-level overview of what the project aims to achieve.
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