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GFG Alliance Nnoc Engineer Interview Questions and Answers
GFG Alliance Nnoc Engineer Interview Experiences
1 interview found
Anonymous
(2 Questions)
- Q1. Tell me about yourself
- Ans.
I am a dedicated and experienced Nnoc Engineer with a strong background in network operations and troubleshooting.
Over 5 years of experience in network operations
Proficient in troubleshooting network issues
Skilled in configuring and maintaining network equipment
Certified in Cisco networking technologies
- Q2. What is tech used
- Ans.
Various technologies are used in Nnoc Engineer role, including networking, programming languages, cloud computing, and cybersecurity.
Networking technologies such as TCP/IP, DNS, DHCP
Programming languages like Python, Java, C++
Cloud computing platforms such as AWS, Azure, Google Cloud
Cybersecurity tools and techniques like firewalls, encryption, penetration testing
(1 Question)
- Q1. Tell me about project
- Ans.
I led a team to design and implement a network operations center for a large telecommunications company.
Responsible for planning and designing the layout of the network operations center
Managed a team of engineers to implement the necessary infrastructure and systems
Ensured the network operations center met all performance and security requirements
Collaborated with stakeholders to gather requirements and provide regula
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I applied via Naukri.com and was interviewed in Nov 2024. There was 1 interview round.
(16 Questions)
- Q1. What are custom hooks in React, and what are their use cases? Additionally, can you provide an example of a custom hook that performs an API call and utilizes the retrieved data?
- Ans.
Custom hooks in React are reusable functions that allow you to extract component logic into separate functions for better code organization and reusability.
Custom hooks are created using the 'use' prefix and can be used to share logic between components.
Use cases for custom hooks include fetching data from an API, handling form state, managing local storage, and more.
Example of a custom hook for API call: const useFetc...
- Q2. What is the difference between useMemo and useCallback in React?
- Ans.
useMemo is used to memoize a value, while useCallback is used to memoize a function.
useMemo is used to memoize a value and recompute it only when its dependencies change.
useCallback is used to memoize a callback function and prevent unnecessary re-renders.
Example: useMemo can be used to memoize the result of a complex computation, while useCallback can be used to memoize an event handler function.
- Q3. What is the difference between class-based components and functional components in React?
- Ans.
Class-based components use ES6 classes and have lifecycle methods, while functional components are simpler and use functions.
Class-based components use ES6 classes to create components, while functional components are created using functions.
Class-based components have lifecycle methods like componentDidMount and componentDidUpdate, while functional components do not.
Functional components are simpler and more lightweig...
- Q4. How can you implement the lifecycle of a React component in a functional component?
- Ans.
Implementing the lifecycle of a React component in a functional component
Use the useEffect hook to replicate lifecycle methods like componentDidMount, componentDidUpdate, and componentWillUnmount
Pass an empty array as the second argument to useEffect to mimic componentDidMount
Pass a variable or state as the second argument to useEffect to mimic componentDidUpdate
Return a cleanup function inside useEffect to mimic compo
- Q5. What are the various state management techniques available in React?
- Ans.
Various state management techniques in React include Context API, Redux, and local state.
Context API: React's built-in solution for passing data through the component tree without having to pass props down manually at every level.
Redux: A popular state management library for React applications, allowing for a centralized store to manage application state.
Local state: Managing state within individual components using us
- Q6. What is the architecture of Redux, and what purposes do middlewares serve within it?
- Ans.
Redux is a predictable state container for JavaScript apps. Middlewares are functions that intercept actions before they reach the reducer.
Redux follows a unidirectional data flow architecture.
Middlewares in Redux are functions that can intercept, modify, or dispatch actions.
Common use cases for middlewares include logging, asynchronous API calls, and handling side effects.
Examples of popular Redux middlewares are Redu...
- Q7. What is hoisting in JavaScript?
- Ans.
Hoisting in JavaScript is the behavior where variable and function declarations are moved to the top of their containing scope during the compilation phase.
Variable declarations are hoisted to the top of their scope, but not their initializations.
Function declarations are fully hoisted, meaning they can be called before they are declared.
Hoisting can lead to unexpected behavior if not understood properly.
- Q8. What is event bubbling in JavaScript?
- Ans.
Event bubbling is the propagation of events from the target element up through its ancestors in the DOM tree.
Events triggered on a child element will 'bubble up' and trigger on parent elements.
Event listeners can be attached to parent elements to handle events from multiple child elements.
Stopping event propagation can be done using event.stopPropagation() or event.stopImmediatePropagation().
- Q9. What are block scope and function scope in JavaScript?
- Ans.
Block scope and function scope are two types of scopes in JavaScript that determine the visibility and accessibility of variables.
Block scope refers to the visibility of variables within a block of code enclosed by curly braces. Variables declared with 'let' and 'const' have block scope.
Function scope refers to the visibility of variables within a function. Variables declared with 'var' have function scope.
Variables de...
- Q10. Have you had experience working with semantic tags in HTML?
- Ans.
Yes, I have experience working with semantic tags in HTML.
Used semantic tags like <header>, <nav>, <main>, <section>, <article>, <aside>, <footer> for better structure and SEO.
Understand the importance of using semantic tags for accessibility and search engine optimization.
Semantic tags help in organizing content and making it more readable for developers and browsers.
- Q11. What are the various methods for creating an object in JavaScript?
- Ans.
Various methods for creating an object in JavaScript include object literals, constructor functions, ES6 classes, and Object.create() method.
Object literals: var obj = { key: value };
Constructor functions: function ObjectName() { this.key = value; } var obj = new ObjectName();
ES6 classes: class ClassName { constructor() { this.key = value; } } var obj = new ClassName();
Object.create() method: var obj = Object.create(pr
- Q12. What are the differences between shallow copy and deep copy in JavaScript?
- Ans.
Shallow copy only copies the references of nested objects, while deep copy creates new copies of nested objects.
Shallow copy creates a new object but does not create copies of nested objects, only copies their references.
Deep copy creates a new object and also creates new copies of all nested objects.
Shallow copy can be achieved using Object.assign() or spread operator, while deep copy can be achieved using JSON.parse(
- Q13. What will be the output of the following JavaScript code fragment: `const a; function test() { console.log(a); }; test();`?
- Ans.
The code will throw an error because 'a' is declared but not initialized.
The code will result in a ReferenceError because 'a' is declared but not assigned a value.
Variables declared with 'const' must be initialized at the time of declaration.
Initializing 'a' with a value before calling test() will prevent the error.
- Q14. How can you use CSS to arrange elements in a row and column layout?
- Ans.
CSS can be used to arrange elements in a row and column layout using flexbox or grid layout properties.
Use display: flex; for a row layout and display: flex; flex-direction: column; for a column layout
Use justify-content and align-items properties to align items in the main axis and cross axis respectively
For grid layout, use display: grid; and grid-template-columns or grid-template-rows to define the layout
- Q15. Have you utilized CSS preprocessors, and if so, which ones?
- Ans.
Yes, I have utilized CSS preprocessors such as SASS and LESS.
I have experience using SASS to streamline my CSS workflow by utilizing variables, mixins, and nesting.
I have also worked with LESS to improve code organization and maintainability through features like variables and functions.
- Q16. If I have assigned different colors to an ID and a class and applied both to the same element, which color will be applied based on CSS specificity precedence?
- Ans.
The color applied will be based on the specificity of the selector, with ID having higher specificity than class.
ID has higher specificity than class in CSS
Color applied will be based on the selector with higher specificity
Example: If ID selector has color red and class selector has color blue, the color applied will be red
Interview Preparation Tips
- Javascript
- React.Js
- HTML
- CSS
Skills evaluated in this interview
Selected
I applied via Company Website and was interviewed in Dec 2024. There were 2 interview rounds.
There are two main sections: foundation and advanced. The foundation section consists of three subsections: quantitative, reasoning, and verbal. If you pass the foundation section but do not clear the advanced section, you will be considered for either the ninja role or the digital role during the interview process. The advanced section includes advanced aptitude questions and two coding questions.
(5 Questions)
- Q1. Can you provide an introduction about yourself?
- Q2. 3 to 4 questions based on database
- Q3. 2 easy coding questions
- Q4. Questions based on technology that I knew
- Q5. Situation based questions
Interview Preparation Tips
Selected
There were a total of seven sections: verbal ability, logical reasoning, arithmetic problems, verbal reasoning, puzzles, pseudocodes, and essay writing, with each section having its own cutoff scores.
(5 Questions)
- Q1. What is the SQL query to retrieve the person with the highest salary?
- Q2. Can you describe the projects you have worked on?
- Q3. Write a query to merge 2 tables?
- Q4. Tell me about the internship that you have done?
- Q5. Behavioural questions
I was interviewed in Dec 2024.
(2 Questions)
- Q1. They asked me regarding project
- Q2. Sql queries and data bricks related questions
(1 Question)
- Q1. Details explaination on project that I have worked and optimization techniques
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Dec 2024. There was 1 interview round.
(5 Questions)
- Q1. Scenario based questions on Azure data factory and pipelines
- Q2. Optimisation technic to improve the performance of databricks
- Q3. What is Autoloader
- Q4. What is unity catalog
- Q5. How you do the alerting mechanism in adf for failed pipelines
I applied via Company Website and was interviewed in Nov 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Sql constrainsts, star schema, dml dcl commands
- Q2. About cureent project and responsibilities
(2 Questions)
- Q1. Current projects and resposibilities
- Q2. Where vs having, reason for job change
Interview Preparation Tips
2. Technical with senior manager- about project ,where vs having , reason of job change
I applied via Naukri.com and was interviewed in Oct 2024. There were 2 interview rounds.
(7 Questions)
- Q1. How do you optimize SQL queries?
- Ans.
Optimizing SQL queries involves using indexes, avoiding unnecessary joins, and optimizing the query structure.
Use indexes on columns frequently used in WHERE clauses
Avoid using SELECT * and only retrieve necessary columns
Optimize joins by using INNER JOIN instead of OUTER JOIN when possible
Use EXPLAIN to analyze query performance and make necessary adjustments
- Q2. How do you do performance optimization in Spark. Tell how you did it in you project.
- Ans.
Performance optimization in Spark involves tuning configurations, optimizing code, and utilizing caching.
Tune Spark configurations such as executor memory, number of executors, and shuffle partitions.
Optimize code by reducing unnecessary shuffles, using efficient transformations, and avoiding unnecessary data movements.
Utilize caching to store intermediate results in memory and avoid recomputation.
Example: In my projec...
- Q3. What is SparkContext and SparkSession?
- Ans.
SparkContext is the main entry point for Spark functionality, while SparkSession is the entry point for Spark SQL.
SparkContext is the entry point for low-level API functionality in Spark.
SparkSession is the entry point for Spark SQL functionality.
SparkContext is used to create RDDs (Resilient Distributed Datasets) in Spark.
SparkSession provides a unified entry point for reading data from various sources and performing
- Q4. When a spark job is submitted, what happens at backend. Explain the flow.
- Ans.
When a spark job is submitted, various steps are executed at the backend to process the job.
The job is submitted to the Spark driver program.
The driver program communicates with the cluster manager to request resources.
The cluster manager allocates resources (CPU, memory) to the job.
The driver program creates DAG (Directed Acyclic Graph) of the job stages and tasks.
Tasks are then scheduled and executed on worker nodes ...
- Q5. Calculate second highest salary using SQL as well as pyspark.
- Ans.
Calculate second highest salary using SQL and pyspark
Use SQL query with ORDER BY and LIMIT to get the second highest salary
In pyspark, use orderBy() and take() functions to achieve the same result
- Q6. 2 types of modes for Spark architecture ?
- Ans.
The two types of modes for Spark architecture are standalone mode and cluster mode.
Standalone mode: Spark runs on a single machine with a single JVM and is suitable for development and testing.
Cluster mode: Spark runs on a cluster of machines managed by a cluster manager like YARN or Mesos for production workloads.
- Q7. If you want very less latency - which is better standalone or client mode?
- Ans.
Client mode is better for very less latency due to direct communication with the cluster.
Client mode allows direct communication with the cluster, reducing latency.
Standalone mode requires an additional layer of communication, increasing latency.
Client mode is preferred for real-time applications where low latency is crucial.
(2 Questions)
- Q1. Scenario based. Write SQL and pyspark code for a dataset.
- Q2. If you have to find latest record based on latest timestamp in a table for a particular customer(table is having history) , how will you do it. Self join and nested query will be expensive. Optimized query...
Interview Preparation Tips
- SQL
- pyspark
- ETL
Skills evaluated in this interview
Sashikanta Parida
I applied via Recruitment Consulltant and was interviewed in Nov 2024. There were 2 interview rounds.
(3 Questions)
- Q1. What are different type of joins available in Databricks?
- Ans.
Different types of joins available in Databricks include inner join, outer join, left join, right join, and cross join.
Inner join: Returns only the rows that have matching values in both tables.
Outer join: Returns all rows when there is a match in either table.
Left join: Returns all rows from the left table and the matched rows from the right table.
Right join: Returns all rows from the right table and the matched rows ...
- Q2. How do you make your data pipeline fault tolerant?
- Ans.
Implementing fault tolerance in a data pipeline involves redundancy, monitoring, and error handling.
Use redundant components to ensure continuous data flow
Implement monitoring tools to detect failures and bottlenecks
Set up automated alerts for immediate response to issues
Design error handling mechanisms to gracefully handle failures
Use checkpoints and retries to ensure data integrity
- Q3. What is AutoLoader?
- Ans.
AutoLoader is a feature in data engineering that automatically loads data from various sources into a data warehouse or database.
Automates the process of loading data from different sources
Reduces manual effort and human error
Can be scheduled to run at specific intervals
Examples: Apache Nifi, AWS Glue
(2 Questions)
- Q1. How do you connect to different services in Azure?
- Ans.
To connect to different services in Azure, you can use Azure SDKs, REST APIs, Azure Portal, Azure CLI, and Azure PowerShell.
Use Azure SDKs for programming languages like Python, Java, C#, etc.
Utilize REST APIs to interact with Azure services programmatically.
Access and manage services through the Azure Portal.
Leverage Azure CLI for command-line interface interactions.
Automate tasks using Azure PowerShell scripts.
- Q2. What are linked Services?
- Ans.
Linked Services are connections to external data sources or destinations in Azure Data Factory.
Linked Services define the connection information needed to connect to external data sources or destinations.
They can be used in Data Factory pipelines to read from or write to external systems.
Examples of Linked Services include Azure Blob Storage, Azure SQL Database, and Amazon S3.
Selected
I applied via Approached by Company and was interviewed in Oct 2024. There was 1 interview round.
(3 Questions)
- Q1. 1) OOPS in java, and told to explain abstraction, encapsulation, inheritance with practical code 2) Exception handling(globally), Authentication and authorization 3) SOLID principles and factory design pat...
- Ans.
Interview questions for Software Engineer position covering OOPS concepts, exception handling, SOLID principles, Java 8 features, and Streams.
Abstraction in OOPS: Hiding implementation details. Example: Abstract class Shape with method draw().
Encapsulation in OOPS: Bundling data and methods that operate on the data. Example: Class Employee with private fields and public getters/setters.
Inheritance in OOPS: Reusing code...
- Q2. 1) Advantage of springboot over spring 2) Tell me all the anotations you know in spring 3) What are CRUD operations, write controller layer and use validating annotations like @NotNull, @valid etc. how to ...
- Ans.
The interview questions cover various topics related to Spring framework, REST vs SOAP, JPA repository, Feign client, circuit breaker, and Spring Security.
Spring Boot provides a simpler and faster way to set up and run Spring applications compared to traditional Spring.
Common annotations in Spring include @Controller, @Service, @Repository, @Autowired, @Component, @RequestMapping, @GetMapping, @PostMapping, @PutMapping...
- Q3. 1) ACID properties 2) DBMS commands 3) inner queries 4) Joins 5) S3 bucket congif and how to handle file and upload and retrieve in s3 6) Ci/Cd basic flow and docker explaination
Interview Preparation Tips
Skills evaluated in this interview
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