20+ Interview Questions and Answers

A channel in Go is a communication mechanism that allows goroutines to communicate with each other.

• Buffered channels have a specific capacity and can send multiple values without the need for a corresponding receive operation immediately.

• Unbuffered channels have no capacity and require both a send and receive operation to be ready at the same time for communication to occur.

Scaling refers to the ability of a system to handle increasing amounts of work or its potential to accommodate growth.

• Horizontal scaling involves adding more machines to distribute the load, while vertical scaling involves increasing the resources of a single machine.

• Horizontal scaling is more cost-effective and provides better fault tolerance, but can be more complex to implement.

• Vertical scaling is simpler to implement but can be more expensive and may have limitations in t...read more

Go code to remove duplicate elements from a slice of strings

• Use a map to keep track of unique elements

• Iterate over the slice and add elements to the map

• Create a new slice with unique elements from the map

Interview questions for Enodeb Engineer on LTE attach, paging, handover, DCI formats, lab setup, and recent bug identification.

• LTE attach procedure involves UE sending attach request to MME and receiving attach accept message.

• IE's in Paging include IMSI, TMSI, and EPS bearer identity.

• SRVCC allows handover from LTE to 3G/2G networks while maintaining voice call continuity.

• Handover procedure in LTE involves measurement, selection, and execution phases.

• DCI formats in LTE include...read more

Understanding call flows in a detailed telecom Linux environment.

• Study the signaling protocols used in telecom networks such as SIP, H.323, or SS7.

• Understand the role of various network elements like gateways, proxies, and servers in call setup and teardown.

• Learn about the Linux tools and commands used for monitoring and troubleshooting telecom services.

• Practice analyzing packet captures to understand the flow of data during a call.

• Familiarize yourself with common issues and ...read more

Concurrency in Go is achieved using goroutines and channels.

• Use goroutines to run functions concurrently

• Communicate between goroutines using channels

• Avoid using shared memory for synchronization

Arrays have fixed length, slices are dynamic and can grow/shrink. Slices are references to arrays.

• Arrays have fixed length, specified at compile time.

• Slices are dynamic, can grow or shrink at runtime.

• Slices are references to arrays, allowing for more flexibility.

• Example: var arr [3]string // array with fixed length of 3

• Example: slice := make([]string, 0) // slice with dynamic length

Yes, I am open to relocation to either Gurgaon or Bangalore.

• I am flexible and adaptable to new environments.

• I am excited about the opportunity to work in different locations and gain new experiences.

• I am willing to relocate for the job and make the necessary adjustments to ensure a smooth transition.

• I have researched the company's presence in both locations and am comfortable with the potential move.

Implementing a struct in Go code

• Define a struct using the 'type' keyword

• Add fields to the struct with their respective data types

• Access struct fields using dot notation

Containerization is a method of packaging, distributing, and running applications in isolated environments called containers.

• Containers are lightweight, portable, and can run on any platform that supports containerization.

• They include everything needed to run the application, such as code, runtime, system tools, libraries, and settings.

• Popular containerization tools include Docker, Kubernetes, and Podman.

• Containerization helps in achieving consistency in development, testing,...read more

Design and implement a loan application system using Java.

• Identify the necessary data fields for a loan application

• Create a user interface for applicants to input their information

• Implement validation checks for input data

• Calculate loan eligibility based on input data

• Store application data in a database

• Generate loan approval/rejection letters

We used a microservices architecture for productionizing the model.

• We broke down the model into smaller, independent services.

• Each service was responsible for a specific task.

• We used containerization to deploy and manage the services.

• We used Kubernetes for orchestration and scaling.

• We implemented a RESTful API for communication between services.

• We used a message broker for asynchronous communication.

• We used a load balancer for distributing traffic.

• We implemented monitoring an...read more

Struct is a user-defined data type that groups related data fields together. Interface defines a set of methods that a type must implement.

• Struct is used to create complex data structures by grouping related data fields together.

• Interface defines a set of methods that a type must implement. It allows for polymorphism in Go.

• Example: type Person struct { Name string; Age int }

• Example: type Shape interface { Area() float64 }

• Example: type Circle struct { Radius float64 }

• Example: ...read more

The 'Volatile' keyword in C# is used to indicate that a field might be modified by multiple threads that are executing at the same time.

• Ensures that any read or write operation on the variable is done directly from the main memory and not from the CPU cache.

• Useful when working with multithreaded applications to prevent unexpected behavior due to caching.

• Example: 'volatile int count = 0;'

Goroutine is a lightweight thread managed by Go runtime, allowing concurrent execution of functions.

• Goroutines are created using the 'go' keyword in Go programming language.

• They are more lightweight than threads and are managed by the Go runtime.

• Goroutines allow for concurrent execution of functions without the need for manual thread management.

• Example: go myFunction()

• Example: go func() { // code here }

Kubernetes architecture, command line usage, and troubleshooting steps

• Kubernetes architecture includes master nodes, worker nodes, and etcd for storing cluster data

• Use kubectl command line tool to interact with Kubernetes clusters

• Troubleshooting steps involve checking pod status, logs, and events for errors

• Common kubectl commands include kubectl get, kubectl describe, and kubectl logs

• Debugging with kubectl exec to access containers within pods

To redirect api call from version1 to version2, update the endpoint in the code or use a reverse proxy.

• Update the endpoint in the code to point to version2

• Use a reverse proxy like NGINX to redirect calls from version1 to version2

• Implement a routing mechanism to handle the redirection

5G network is divided into three main layers: Radio Access Network (RAN), Transport Network, and Core Network.

• Radio Access Network (RAN) includes base stations and antennas for wireless communication.

• Transport Network connects RAN to Core Network, using technologies like fiber optics.

• Core Network manages user authentication, mobility, and data routing.

• Examples: RAN - gNodeB, Transport Network - Optical fiber, Core Network - 5G Core

I prioritize tasks based on deadlines, importance, and impact on overall project goals.

• I create a to-do list with all tasks and deadlines

• I assess the importance and impact of each task on project goals

• I prioritize tasks based on deadlines, importance, and impact

• I regularly review and adjust priorities as needed

Create a Bash script to automate a network operation task.

• Use variables to store data

• Use loops for repetitive tasks

• Use conditional statements for decision making

• Utilize functions for modular code

• Handle errors and exceptions gracefully

A dictionary is a collection of words and their definitions, often organized alphabetically.

• Contains words and their meanings

• Organized alphabetically

• Can also include synonyms, antonyms, and usage examples

CICD in Jenkins refers to Continuous Integration and Continuous Deployment processes automated through Jenkins.

• Continuous Integration (CI) involves automatically building and testing code changes frequently.

• Continuous Deployment (CD) involves automatically deploying code changes to production.

• Jenkins is a popular automation server used for implementing CICD pipelines.

• CICD in Jenkins helps in automating the software delivery process, ensuring faster and more reliable releases.