API Methods and C4 Architecture Quiz

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Questions and Answers

What is the primary purpose of the POST method in API interactions?

To delete existing resources

To retrieve data from the server

To create new resources (correct)

To modify existing resources

Which component is NOT part of the request structure in an API contract?

Path Parameters

Request Body

Headers

Authentication Protocol (correct)

What does a status code of 404 indicate in an API response?

Unauthorized access

Server error occurred

Resource not found (correct)

Request has succeeded

In an API contract, what is typically included in the response body?

Format of the response data Signup and view all the answers

Which of the following is a common error code typically included in an API contract?

403 Signup and view all the answers

What does the Context level of the C4 Model primarily show?

The big picture of the system and its interactions with external entities Signup and view all the answers

Which of the following best describes Monolithic Architecture?

A traditional integrated approach where all components are bundled as a single unit Signup and view all the answers

In which level of the C4 Model would you find a detailed analysis of the components within a container?

Component Signup and view all the answers

What is the primary purpose of the C4 Model in software architecture?

To visualize software architecture in an easy-to-understand way Signup and view all the answers

What are the three interconnected components of the Model-View-Controller (MVC) architectural pattern?

Model, View, Controller Signup and view all the answers

Which level of the C4 Model provides a close-up of the actual code structure?

Code Signup and view all the answers

What does the Container level of the C4 Model focus on?

Major containers such as applications and databases Signup and view all the answers

What characterizes the separation of concerns in MVC architecture?

The application is divided into tasks, making it easier to manage and scale Signup and view all the answers

What principle does Event-Driven Architecture primarily operate on?

Asynchronous communication Signup and view all the answers

Which architectural style emphasizes the use of independent services that communicate through standardized protocols?

Service-Oriented Architecture (SOA) Signup and view all the answers

What is a key characteristic of Microservices Architecture?

Each service runs its own process and communicates through APIs. Signup and view all the answers

What does UML stand for in the context of software development?

Unified Modelling Language Signup and view all the answers

How is information represented in a Use Case Diagram?

It displays the interactions between users and systems. Signup and view all the answers

Which of these diagrams is specifically used to show the order of interactions between objects?

Sequence Diagram Signup and view all the answers

What type of relationship is represented by inheritance in a Class Diagram?

“is-a” relationship Signup and view all the answers

In service-oriented architecture, what does each service provide?

Its functionality through standardized protocols. Signup and view all the answers

What distinguishes aggregation from composition in terms of object relationships?

Aggregation allows parts to exist independently, while composition does not. Signup and view all the answers

What is a crucial component of an API contract?

Clear endpoint definitions Signup and view all the answers

How can the role of an object be indicated in an association?

By using role names Signup and view all the answers

Which of the following statements about API methods is true?

The contract specifies which HTTP methods can be used. Signup and view all the answers

What is meant by cardinality in the context of associations?

The number of instances involved in the relationship Signup and view all the answers

Which of the following is NOT a part of the typical structure in API contracts?

Cost of API usage Signup and view all the answers

What best describes the behavior of an object in a composition relationship?

The parts depend on the whole for their existence. Signup and view all the answers

What kind of structure do API responses typically use?

JSON, XML, and Status Codes Signup and view all the answers

Study Notes

Documentation Process Overview

Documentation is a crucial part of software development.
A technical team creates documentation from user stories and other inputs.
SRS documents define the functionality and non-functional aspects of a system.
High-level design (HLD) and low-level design (LLD) documents the system's structure.
UML diagrams provide a visual representation of the system's design, including API documentation, sequence diagrams, and class diagrams.
Business teams also contribute with famous architecture specifications.
Design patterns are also factored in.

HLD & LLD

HLD focuses on the overall architecture and structure of the system, component relationships.
This step is typically carried out by architects.
LLD dives into the details of implementation, describing the implementation details.
Engineers usually create LLDs.

C4 Model

The C4 Model is a framework for visualizing software architecture, making it easier to understand.
It consists of four hierarchical levels:
- Context (Level 1): Outlines system scope, its interactions with external entities.
- Container (Level 2): Presents major components (applications, databases).
- Component (Level 3): Describes internal components within containers.
- Code (Level 4): Provides a detailed view of the code structure within a single component using, for example, UML diagrams.

Famous Software Architectures

Monolithic architecture: All application components tightly integrated into one unit.
Model-View-Controller (MVC) architecture: Separates an application into three interconnected components (Model, View, Controller).
Event-driven architecture: Components communicate through events, enabling asynchronous communication.
Service-Oriented Architecture (SOA): Structures an application as a set of independent services.
Microservices architecture: Decomposes an application into small, independent services.

UML Diagrams

UML is a standard language used to visually represent software designs.
Use Case Diagrams: Show how users interact with a system.
Sequence Diagrams: Illustrate interactions between objects in the sequential order.
Class Diagrams: Represent classes and objects within a system, their relationships.

API Contracts

API (Application Programming Interface) is a set of rules to ensure efficient interaction between different software systems.
API Contract: A formal agreement clarifying how systems interact through APIs.
Key elements of an API contract include:
- Endpoint definitions (URL path).
- HTTP methods (GET, POST, PUT, DELETE).
- Request structure (e.g., parameters, headers, request body).
- Response structure (e.g., codes, structure, data types).
- Error codes.
- Authentication protocols.
Importance of API contracts to prevent ambiguity and simplifying integration.

Class Diagram Relations

Associations: Relationships between classes.
Inheritance: One class is a sub-type of another.
Realization: Describes the relationship between an interface and a concrete class that implements the interface.
Dependency: One class depends on another.
Aggregation: One class is part of another, they can also exist separately.
Composition: Indicates a "part-of" relationship where the part cannot exist independently.

Association in Diagrams

Cardinality: Defines the number of instances in a relationship.
- Exactly one (1)
- Zero or one (0..1)
- Zero or more (0..*)
- One or more (1..*)
Ordered relationships (e.g. a list).
Roles: Shows the behavior of an object in the association.

Connecting Frontend and Backend

Frontend (e.g., a web application) communicates with backend (e.g., an application server) and database.
Different server types may be used: Web Server, Application server
Communication is commonly achieved using APIs (e.g., REST APIs).

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Description

Test your knowledge on API interactions and C4 architecture. This quiz covers various aspects including HTTP methods, status codes, and the principles of software architecture models. Dive into the core concepts and strengthen your understanding of modern architectural patterns.