Guest-tek Global NOC Network Engineer Interview Questions and Answers

Q1. How node.js works
Ans. 
Node.js is a runtime environment that allows JavaScript code to run on the server-side.
• Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient.

• It uses the V8 JavaScript engine from Google Chrome to execute code.

• Node.js allows developers to build scalable network applications using JavaScript.

• It has a large ecosystem of libraries and frameworks, such as Express.js for web applications.
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Q2. What is event loop in Node.js
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Event loop in Node.js is a mechanism that allows Node.js to perform non-blocking I/O operations.
• Event loop is responsible for handling asynchronous operations in Node.js.

• It allows Node.js to perform multiple operations concurrently without blocking the execution.

• Event loop continuously checks the event queue for any pending events and executes them in a loop.

• Example: When reading a file in Node.js, the event loop allow...read more
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Q1. How to deploy node.js application
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Node.js applications can be deployed using various methods such as using a hosting service, containerization, or serverless platforms.
• Use a hosting service like Heroku, AWS, or DigitalOcean to deploy the application.

• Containerize the application using Docker and deploy it on a container orchestration platform like Kubernetes.

• Utilize serverless platforms like AWS Lambda or Google Cloud Functions for deploying serverless
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Q2. List AWS services used
Ans. 
Some AWS services commonly used by Node JS developers are EC2, S3, Lambda, RDS, and API Gateway.
• EC2 (Elastic Compute Cloud) for scalable virtual servers

• S3 (Simple Storage Service) for object storage

• Lambda for serverless computing

• RDS (Relational Database Service) for managed databases

• API Gateway for creating, publishing, maintaining, monitoring, and securing APIs
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Q1. Routing protocols
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Q1. Tell me about yourself. Tell me about your project and technical background What project you have done . Technology? Which AWS services you have used tell me about AWS lambda function How to make aws lamb...read more
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Q2. When did you used and where did you used redis cache
Ans. 
I have used Redis cache in multiple projects to improve performance and reduce database load.
• Used Redis cache to store frequently accessed data for faster retrieval

• Implemented Redis cache in a Node.js application to cache API responses

• Utilized Redis cache to store session data for improved user experience
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Q1. What is the reason data didnt reached backend
Ans. 
Possible reasons for data not reaching backend include network issues, incorrect API endpoints, server errors, and client-side validation errors.
• Network connectivity issues

• Incorrect API endpoints

• Server errors

• Client-side validation errors
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Q2. How to scale app for more users
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To scale an app for more users, consider optimizing code, using caching, load balancing, and horizontal scaling.
• Optimize code for better performance

• Implement caching to reduce database load

• Use load balancing to distribute traffic evenly

• Consider horizontal scaling by adding more servers

• Use microservices architecture for better scalability
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Q1. All basic question related to node.js like event loop,
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Q2. What is event loop?
Ans. 
Event loop is a mechanism in node.js that allows non-blocking I/O operations by handling asynchronous tasks efficiently.
• Event loop is responsible for handling asynchronous operations in node.js.

• It allows node.js to perform non-blocking I/O operations by delegating tasks to the operating system.

• Event loop continuously checks the event queue for new tasks and executes them in a loop.

• It helps in preventing the blocking of...read more
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Q1. Tell me about yourself
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Q2. How was your last weekend
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Q1. NOC interview questions
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Q1. Roles and responsibilities for NOC engineer
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Technical and project

Technical & project oriented

Q1. Salary and benefits..
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Q2. Salary and benefits
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