Krishna Diagnostic Centre Interview Questions and Answers

Q1. Current CTC, Expected CTC, Notice Period, Skill set
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Q2. Open for Fixed term hire? Open for working from client location at Gurgaon? (3 days from office)
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Q1. Introduction, Current role and responsibilities
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Q2. List out the achievements in current project, Tools used
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Q3. Pilot vs Beta testing. How can newly developed functionality be tested via automation rather doing it manually?
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Q4. Primary key vs Unique key in SQL, Query to find row having last id in sql
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Q5. Explain Software Testing Life Cycle, Defect Life Cycle
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Q6. What's the meaning of 303 status code in API? Put vs Delete method in API What is 3 point estimation technique in Agile?
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Q7. What kind of links and labels can be tagged to a bug in jira?
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Q8. Have you done shell scripting? What does grep, href commands do in unix?
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Q9. As a lead, how would you resolve conflict with a team member? As a lead, if you are given plenty of tasks to be completed with in a limited time frame. What would be your approach in doing them?
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Q10. Open for relocating to Bangalore and working from client's office? (with no relocation bonus) Open for working in night / rotational shift? (with no additional compensation) Open for working in long exten...read more
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Q1. What are your salary expectations?
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Q2. What has been your experience in each of the companies you have worked for?
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Q1. Can you tell me about yourself?
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Q2. Could you briefly describe the companies you have worked for?
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Q3. What technologies have you worked with, and what was your role in each?
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Q4. What are some use case studies related to the technologies you have worked with?
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Q1. Tell me about yourself?
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Q2. Please explain about your experience ?
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Q3. What is Invoice processing?
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Q4. Credit note means?
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Q5. Tell me about the Critical incident or situation, that you face during the work and how you solve it?
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Q6. Journal entries for : purchase made, purchase on credit?
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Q7. Things need to notice in invoice and verify it before processing?
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Q1. Are you will to work at the mentioned location?
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Q2. Excepted salary?
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Q3. Are you ok with the fixed salary package?
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Q4. Are you aware of you roles and responsibilities of the job?
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Quantitative aptitude, logical reasoning, verbal ability, technical.

Q1. The interview consisted of multiple rounds covering technical, functional, and real-time scenarios in SAP MM. The panel assessed knowledge in Master Data, Procurement, Inventory Management, Invoice Verific...read more
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Q1. I participated in my HR interview, during which the interviewer initially requested that I introduce myself. Following that, they asked about my extracurricular activities and family background. Lastly, th...read more
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To the job programming in a group discussion on a developed to the company

Q1. What was the company results
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Q2. To the companie timings and shifts
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Q1. To the invite in a company
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Q2. In a job of Wipro company to the joined
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Q3. I am joined ina Wipro company
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I am joined in a company because to my family problems and my responsibilities

To the solve in a family problems and i joined to the company

I am Bsc complete in a job to the Wipro company are joined

It was easy, bacis aptitude questions asked in this round

Q1. It was a Ai generated communication test, where you have to repeat sentence, basic english question asked, and the ability of communication was cheked. Easy to crack
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Q1. This was a technical and hr round
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Q2. What is cloud, vpn, lan, wan? And bacis trouble shooting question
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Q3. What is your hobbies, tell me about your hometown.
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Q1. How many variance in sap?
Ans. 
The number of variances in SAP can vary depending on the specific processes and transactions being analyzed.
• The number of variances in SAP can be influenced by factors such as data entry errors, system glitches, or discrepancies in invoice processing.

• Variances in SAP may be identified through reconciliation processes, exception reports, or manual reviews of accounts payable transactions.

• Examples of variances in SAP inc...read more
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Q2. We cac explain the all accounts receivable and accounts payable
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Accounts receivable and accounts payable are two important aspects of a company's financial operations.
• Accounts receivable refers to money owed to a company by its customers for goods or services provided.

• Accounts payable refers to money owed by a company to its suppliers or vendors for goods or services received.

• Accounts receivable is an asset on the balance sheet, while accounts payable is a liability.

• Managing accoun...read more
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Q3. What is the cost element and cost center?
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Cost element and cost center are key concepts in accounting for tracking and allocating costs within an organization.
• Cost element refers to the specific types of costs incurred by an organization, such as materials, labor, or overhead.

• Cost center is a specific department, team, or function within an organization that is responsible for incurring costs.

• Cost elements are assigned to cost centers to track and allocate cos...read more
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Q4. How many we have currencies in sap?
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SAP supports over 160 currencies worldwide.
• SAP supports over 160 currencies for global transactions.

• Currencies can be configured in SAP using transaction code OB22.

• Each currency is assigned a unique currency code (e.g. USD for US Dollar, EUR for Euro).
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Q5. How many types of projects
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There are various types of projects, including internal projects, external projects, research projects, and development projects.
• Internal projects focus on improving processes within the organization.

• External projects involve working with external partners or clients.

• Research projects aim to gather data and analyze findings.

• Development projects focus on creating new products or services.

• Examples: IT system implementati...read more
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Q1. API Gateway implementation
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API Gateway implementation is a centralized service that routes, manages, and secures API calls.
• API Gateway acts as a single entry point for all API calls

• It can handle authentication, rate limiting, caching, and request/response transformations

• Examples include AWS API Gateway, Apigee, Kong
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Q2. Circuit breaker implementation
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Circuit breaker is a design pattern used to prevent system overload by temporarily stopping requests to a failing service.
• Circuit breaker monitors requests to a service and opens when the service fails repeatedly.

• It helps prevent cascading failures and allows the system to gracefully degrade.

• Once the circuit breaker is open, it can periodically check if the service has recovered before allowing requests again.
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Q3. What is deadlock? How to avoid it?
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Deadlock is a situation in which two or more processes are unable to proceed because each is waiting for the other to release a resource.
• Avoid circular wait by ensuring processes request resources in the same order.

• Prevent hold and wait by requiring processes to request all needed resources at once.

• Implement a timeout mechanism to break potential deadlocks.

• Use resource allocation graphs to detect and prevent deadlocks.

• ...read more
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Q4. Explain equals() method
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The equals() method is used to compare the contents of two objects for equality.
• The equals() method is a method of the Object class in Java.

• It is used to compare the contents of two objects for equality.

• The default implementation of equals() in the Object class compares memory addresses, so it is often overridden in custom classes to compare content.

• Example: String class overrides equals() method to compare the content
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Q5. How mongodb was integrated in your application?
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MongoDB was integrated in the application by using the official Java driver and configuring connection settings.
• Used the official MongoDB Java driver to interact with the database

• Configured connection settings such as host, port, database name, and authentication credentials

• Implemented CRUD operations using MongoDB Java driver methods

• Utilized MongoDB aggregation framework for complex queries
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Q6. What is hibernate?
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Hibernate is an open-source Java framework that simplifies the development of database interactions in Java applications.
• Hibernate is an Object-Relational Mapping (ORM) tool that maps Java objects to database tables.

• It provides a way to perform database operations using Java objects instead of writing SQL queries.

• Hibernate handles the mapping of Java classes to database tables and vice versa, as well as the generation ...read more
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Q7. Runnable vs Callable interface
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Runnable is a functional interface with a single run() method, while Callable is a functional interface with a single call() method.
• Runnable is used for tasks that do not return a result, while Callable is used for tasks that return a result.

• Callable can throw checked exceptions, while Runnable cannot.

• Callable returns a Future object, which can be used to retrieve the result of the computation.

• Example: Runnable - execu...read more
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Q8. Which type of data is returned by Callable interface?
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The Callable interface in Java returns a Future object.
• Callable interface returns a Future object which represents the result of a computation that may not be available yet.

• The Future object can be used to retrieve the result of the computation, check if it is done, or cancel the computation.

• Example: Callable<Integer> task = () -> { return 42; }
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Q9. HashMap internal working
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Q10. Concurrent HashMap internal working
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Q11. How to monitor health of your application?
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Monitor application health using metrics, logs, alerts, and performance monitoring tools.
• Use monitoring tools like Prometheus, Grafana, or New Relic to track key metrics such as CPU usage, memory usage, response times, and error rates.

• Implement logging to record important events and errors in your application. Use tools like ELK stack (Elasticsearch, Logstash, Kibana) for log analysis.

• Set up alerts to notify you of any...read more
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Q12. How to call an API in a Microservice architecture?
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To call an API in a Microservice architecture, use HTTP requests or messaging protocols like gRPC.
• Use HTTP requests to communicate between microservices

• Implement RESTful APIs for easy integration

• Leverage messaging protocols like gRPC for efficient communication

• Consider using service discovery mechanisms for dynamic API calls
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Q13. Explain Profiles
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Profiles in Java are configurations that define the capabilities of a Java platform.
• Profiles allow developers to target specific types of devices or applications.

• They help in reducing the size of the Java runtime environment by including only the necessary APIs.

• Examples include Java SE Embedded Profile for embedded devices and Java SE Compact Profile for resource-constrained environments.
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Q14. What is OpenFeign, and how is it used in microservices architecture?
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OpenFeign is a declarative web service client used to simplify the process of making HTTP requests in microservices architecture.
• OpenFeign allows developers to define RESTful web services as interfaces and automatically generate the necessary implementation code.

• It integrates seamlessly with Spring Cloud and other microservices frameworks to facilitate communication between services.

• OpenFeign supports features like loa...read more
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Q15. What is the implementation process for service registry and discovery?
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Service registry and discovery involves registering services and allowing clients to discover and connect to them.
• Implement a service registry where services can register themselves with metadata

• Use a service discovery mechanism for clients to find and connect to services

• Implement health checks to ensure services are available and healthy

• Use a load balancer to distribute traffic among multiple instances of a service
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Q16. What are Spring boot actuators?
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Spring Boot Actuators are built-in tools that provide insight into the running application.
• Actuators expose various endpoints to monitor and manage the application.

• They can be used to check health, metrics, environment details, and more.

• Examples include /actuator/health, /actuator/metrics, and /actuator/env.
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Q17. Synchronous vs Asynchronous communication
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Synchronous communication is blocking, while asynchronous communication is non-blocking.
• Synchronous communication waits for a response before continuing, while asynchronous communication does not wait.

• Examples of synchronous communication include traditional function calls, while examples of asynchronous communication include callbacks and promises.

• Synchronous communication can lead to performance issues if there are d...read more
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Q18. Explain Synchronized keyword
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Synchronized keyword is used in Java to control access to shared resources by multiple threads.
• Synchronized keyword can be applied to methods or code blocks to ensure only one thread can access the synchronized code at a time.

• It prevents race conditions and ensures thread safety by creating a lock on the object or class.

• Example: synchronized void myMethod() { // synchronized code block }
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Q19. What are the consequences of excessively using synchronized blocks and methods in Java?
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Excessive use of synchronized blocks and methods in Java can lead to performance issues and potential deadlocks.
• Decreased performance due to increased contention for locks

• Potential deadlocks if multiple threads are waiting for each other to release locks

• Increased complexity and difficulty in debugging and maintaining code

• Use synchronized sparingly and consider alternatives like ConcurrentHashMap or Lock interface
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Q20. How can you determine the number of threads needed for your application?
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The number of threads needed for an application can be determined based on factors like the type of tasks, hardware resources, and performance requirements.
• Consider the type of tasks your application needs to perform - CPU-bound tasks may benefit from more threads, while I/O-bound tasks may not.

• Take into account the hardware resources available - more threads may be beneficial on a multi-core processor compared to a si...read more
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Q21. Explain Executor framework
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Executor framework is a framework in Java that provides a way to manage and execute tasks asynchronously.
• Allows for managing thread execution in a more efficient way

• Provides a way to decouple task submission from task execution

• Supports various types of executors like ThreadPoolExecutor and ScheduledExecutorService

• Helps in handling tasks concurrently and asynchronously
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Q22. Explain BlockingQueue
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BlockingQueue is an interface in Java that represents a queue which supports operations that wait for the queue to become non-empty when retrieving an element and wait for space to become available in the queue when adding an element.
• BlockingQueue is part of the java.util.concurrent package.

• It is used for implementing producer-consumer scenarios where multiple threads are involved.

• Methods like put() and take() are used...read more
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Q1. Why did you leave your previous company?
Ans. 
Seeking new challenges and opportunities for growth.
• Desire for career advancement

• Looking for new challenges

• Seeking better work-life balance

• Company restructuring or downsizing

• Relocation to a new area
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Q2. Other basic questions asked regarding the relevant skills and technologies I have worked with.
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Q1. What is split horison? How can we resolve it?
Ans. 
Split horizon is a technique used in computer networking to prevent routing loops by not advertising routes back to the same interface they were learned from.
• Split horizon is used in distance-vector routing protocols like RIP to prevent routing loops.

• It works by not advertising routes back to the same interface they were learned from.

• Split horizon with poison reverse takes this a step further by advertising the route w...read more
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Q2. What is BGP? How BGP works?
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BGP stands for Border Gateway Protocol, used to exchange routing information between different networks.
• BGP is an exterior gateway protocol used to make routing decisions on the internet.

• It operates by exchanging routing information between different autonomous systems (AS).

• BGP uses TCP port 179 for communication.

• BGP routers maintain a table of IP prefixes and their paths to reach them.

• BGP can be configured to influenc...read more
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Q3. What are the type of BGP and their AD value?
Ans. 
There are two types of BGP: eBGP and iBGP. eBGP has an AD value of 20, while iBGP has an AD value of 200.
• eBGP (External BGP) - AD value: 20

• iBGP (Internal BGP) - AD value: 200
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Q4. What is routing protocol? What are the types of routing protocol?
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Routing protocol is a set of rules used by routers to determine the best path for data packets to travel.
• Routing protocols help routers communicate with each other to dynamically update routing tables.

• Types of routing protocols include distance-vector (e.g. RIP), link-state (e.g. OSPF), and hybrid (e.g. EIGRP).

• Distance-vector protocols determine the best path based on hop count.

• Link-state protocols use a more complex a...read more
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Q5. What is ospf?
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OSPF (Open Shortest Path First) is a routing protocol used to determine the best path for data packets in a network.
• OSPF is a link-state routing protocol

• It uses Dijkstra's algorithm to calculate the shortest path

• OSPF routers exchange link-state advertisements (LSAs) to build a topology map

• It supports VLSM (Variable Length Subnet Masking) and CIDR (Classless Inter-Domain Routing)

• OSPF divides the network into areas to re
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Q6. How do we prevent loop avoidance in BGP?
Ans. 
Preventing loop avoidance in BGP involves using loop prevention mechanisms like AS Path and Route Reflectors.
• Use AS Path attribute to prevent loops by tracking the path a route has taken through AS numbers.

• Implement Route Reflectors to avoid loops in BGP by controlling the route propagation within a cluster.

• Utilize BGP Confederations to divide the network into smaller autonomous systems to prevent loops.

• Regularly monit...read more
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Q7. What is OSI model? What are the layers of OSI model?
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The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers.
• The OSI model stands for Open Systems Interconnection model.

• It helps in understanding how data is transferred from one computer to another over a network.

• The seven layers of OSI model are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has speci...read more
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Q8. How does tracerout works?
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Traceroute is a network diagnostic tool used to track the path packets take from one networked device to another.
• Traceroute sends packets with increasing TTL values to determine the path to a destination.

• Each router along the path sends back an ICMP Time Exceeded message, allowing traceroute to map the route.

• The final destination sends an ICMP Port Unreachable message, indicating the end of the route.

• Traceroute helps i...read more
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Q9. If we see "*****" in tracerout, what it means?
Ans. 
The presence of '*****' in a traceroute indicates that the router is blocking the ICMP packets used by traceroute.
• The '*****' indicates that the router is not responding to the ICMP packets sent by the traceroute tool.

• This could be due to the router being configured to block ICMP traffic for security reasons.

• It can also be caused by a firewall or network filtering rules blocking the ICMP packets.

• In some cases, the '***...read more
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Q10. What are the states in BGP?
Ans. 
BGP states include Idle, Connect, Active, OpenSent, OpenConfirm, Established.
• Idle - Initial state when BGP is not yet established

• Connect - Attempting to establish a TCP connection

• Active - Waiting for a TCP connection to be completed

• OpenSent - Sent an Open message to peer

• OpenConfirm - Received an Open message and waiting for confirmation

• Established - BGP peers are fully established and can exchange routing information
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Q11. If there is a non tech guys on site to replace faulty router with new router, how do you configure the new router?
Ans. 
The new router can be configured remotely using a laptop or mobile device with access to the network.
• Access the router's web interface by entering its IP address in a web browser

• Login using default credentials or credentials provided by the company

• Configure basic settings such as SSID, password, and security settings

• Update firmware if necessary

• Test the connection to ensure it is working properly
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Q12. What are CE and PE routers?
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CE and PE routers are types of routers used in MPLS networks. CE routers connect to customer networks while PE routers connect to provider networks.
• CE routers (Customer Edge) connect to customer networks and are responsible for exchanging routes with customer devices.

• PE routers (Provider Edge) connect to provider networks and are responsible for exchanging routes with other PE routers in the MPLS network.

• CE routers are...read more
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Q13. What is the command to assign an IP address on Juniper router interface?
Ans. 
The command to assign an IP address on a Juniper router interface is 'set interface <interface_name> unit <unit_number> family inet address <ip_address/mask>'
• Use the 'set' command to configure the interface

• Specify the interface name and unit number

• Use the 'family inet' statement to configure an IPv4 address

• Specify the IP address and subnet mask
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Q14. What are the parameters should match in BGP neighbourship?
Ans. 
Parameters for BGP neighbourship include AS number, IP address, subnet mask, and BGP version.
• AS number must match on both neighbors

• IP address must be reachable between neighbors

• Subnet mask should be the same on both neighbors

• BGP version should be compatible between neighbors
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Q15. What is tftp?
Ans. 
tftp stands for Trivial File Transfer Protocol, a simple protocol used for transferring files over a network.
• tftp is a lightweight protocol used for transferring files between devices on a network.

• It operates on UDP port 69.

• tftp does not require user authentication, making it less secure compared to FTP.

• It is commonly used for booting devices over a network, such as in diskless workstations or routers.

• An example of tft...read more
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Q1. What is loop avoidance mechanism in BGP?
Ans. 
Loop avoidance mechanism in BGP prevents routing loops by using loop prevention mechanisms like AS path attribute and route reflectors.
• BGP uses AS path attribute to prevent routing loops by not accepting routes with its own AS number in the path.

• Route reflectors are used in BGP to avoid loops in route propagation within a cluster of routers.

• BGP Confederations can also be used to prevent loops by dividing the AS into sm
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Q2. How tracerout works? What is source and destination IP?
Ans. 
Traceroute is a network diagnostic tool used to track the path packets take from source to destination IP.
• Traceroute sends packets with increasing TTL values to elicit ICMP Time Exceeded responses from routers along the path.

• The source IP is the IP address of the device initiating the traceroute, while the destination IP is the IP address of the target device.

• Traceroute displays the IP addresses of the routers in the p...read more
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Q3. What is public IP and private IP?
Ans. 
Public IP is the address assigned to a device that is directly accessible over the internet, while private IP is used within a private network.
• Public IP is unique and can be accessed from anywhere on the internet

• Private IP is used within a local network and is not directly accessible from the internet

• Public IP is assigned by the Internet Service Provider (ISP)

• Private IP addresses are typically in the ranges of 192.168.
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Q4. How can we configure and a router with support of non tech guy onsite?
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To configure a router with support of a non tech guy onsite, provide step-by-step instructions and visual aids.
• Create a simple, easy-to-follow guide with step-by-step instructions.

• Use visual aids such as diagrams or videos to demonstrate the process.

• Provide clear explanations of each step and troubleshoot common issues.

• Offer remote support or a helpline for additional assistance if needed.
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Q5. What is firewall?
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A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
• Acts as a barrier between a trusted internal network and untrusted external network

• Filters network traffic based on rules set by the administrator

• Can be hardware-based or software-based

• Examples include Cisco ASA, Palo Alto Networks, and Windows Firewall
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Q6. What are the difference between router and switch?
Ans. 
Routers connect multiple networks together while switches connect devices within a single network.
• Routers operate at the network layer (Layer 3) of the OSI model, while switches operate at the data link layer (Layer 2).

• Routers use IP addresses to forward data between networks, while switches use MAC addresses to forward data within a network.

• Routers can determine the best path for data to travel between networks, while...read more
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Q7. What is mpls?
Ans. 
MPLS stands for Multiprotocol Label Switching, a technique used in telecommunications networks to direct data packets along predefined paths.
• MPLS is used to improve network performance and efficiency by quickly routing data packets based on labels instead of IP addresses.

• It allows for traffic engineering, quality of service (QoS) prioritization, and virtual private network (VPN) services.

• MPLS operates at layer 2.5 of t...read more
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Q8. How ftp and tftp works?
Ans. 
FTP and TFTP are protocols used for transferring files over a network.
• FTP (File Transfer Protocol) is a standard network protocol used to transfer files from one host to another over a TCP-based network, such as the internet.

• TFTP (Trivial File Transfer Protocol) is a simpler version of FTP that uses UDP instead of TCP for file transfer.

• FTP requires authentication (username and password) for access, while TFTP does not ...read more
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