Infosys Performance Test Engineer Interview Questions, Process, and Tips

Q1. Why did you use Jmeter?
Ans. 
I used Jmeter for its user-friendly interface, extensive features, and ability to simulate real-world scenarios.
• Jmeter has a user-friendly interface which makes it easy to create and execute performance tests.

• It offers a wide range of features for load testing, stress testing, and performance monitoring.

• Jmeter allows for the simulation of real-world scenarios, helping to identify performance bottlenecks and optimize sy...read more
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Q2. What is SLA in performance testing?
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SLA in performance testing refers to the agreed upon level of service that a system must meet in terms of response time, throughput, and other performance metrics.
• SLA stands for Service Level Agreement

• It defines the expected performance metrics that a system must meet

• SLAs are typically agreed upon between stakeholders and are used to measure the performance of a system

• Examples of SLAs include response time should be le...read more
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Q3. What is Correlation in Jmeter?
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Correlation in JMeter is the process of extracting dynamic values from server responses and passing them as inputs to subsequent requests.
• Correlation is important in performance testing to simulate real user behavior.

• It involves identifying and capturing dynamic values like session IDs, tokens, etc.

• These values are then extracted using regular expressions or built-in JMeter functions.

• The extracted values are stored in ...read more
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Q4. How many types of listeners did you use
Ans. 
I used multiple types of listeners including JMeter listeners, PerfMon Metrics Collector, and InfluxDB Backend Listener.
• JMeter listeners

• PerfMon Metrics Collector

• InfluxDB Backend Listener
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Q5. What is parameterization?
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Parameterization is the process of replacing hard-coded values in a test script with variables to make the script more dynamic and reusable.
• Parameterization helps in simulating real-world scenarios by varying input data during test execution.

• It allows for running the same test script with different sets of data without the need to modify the script each time.

• Common examples of parameterization include using CSV files, ...read more
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Q6. What are threads and thread groups?
Ans. 
Threads are lightweight processes within a process that can run concurrently. Thread groups are a collection of threads.
• Threads are independent sequences of execution within a process.

• Thread groups are used to organize and manage multiple threads together.

• Threads within a group can share resources and communicate with each other.

• Example: In performance testing, threads can simulate multiple users accessing a system con
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Q1. What is API testing
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API testing is a type of software testing that involves testing APIs directly to ensure they meet functionality, reliability, performance, and security requirements.
• API testing involves testing the functionality, reliability, performance, and security of APIs.

• It focuses on verifying that the API meets the requirements specified in its design.

• API testing can be done manually or using automated tools.

• Examples of API test
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Q1. What is thread group
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Thread group is a collection of threads that represent a group of virtual users in a performance test.
• Thread group defines the number of users and the ramp-up period for a performance test.

• Each thread in a thread group represents a virtual user that simulates real user behavior.

• Thread group allows for configuring the concurrency and distribution of virtual users during a test.

• Example: In JMeter, a Thread Group element ...read more
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Q1. What is aggregate report
Ans. 
Aggregate report is a summary of performance test results showing key metrics like average response time, throughput, error rate, etc.
• Aggregate report provides a high-level summary of performance test results

• It includes metrics like average response time, throughput, error rate, and percentiles

• Helps in identifying performance bottlenecks and areas for improvement

• Commonly used in tools like JMeter to analyze performance
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Q1. What is view result tree
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View Result Tree is a listener in JMeter that displays the results of performance tests in a tree format.
• View Result Tree is used to view the response data, request and response headers, and other details of each sample in a performance test.

• It can be used to debug issues in the test script by analyzing the details of each request and response.

• View Result Tree can also be used to view and analyze the performance metric...read more
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Q1. Just personal questions
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Q2. Are you able to relocate
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Q3. Tell me about yourself
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Q4. Are you participated in any events in your college
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Q5. What are your hobbied
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Q1. How to prepare NFR Sheet?
Ans. 
NFR sheet can be prepared by identifying the non-functional requirements and documenting them in a structured format.
• Identify the non-functional requirements such as performance, scalability, reliability, security, usability, etc.

• Document the requirements in a structured format such as a spreadsheet or a table.

• Include details such as the requirement description, acceptance criteria, priority, and any dependencies.

• Ensur...read more
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Q2. How to calculate pacing time?
Ans. 
Pacing time is calculated by dividing the total number of transactions by the duration of the test.
• Pacing time is used to determine the rate at which virtual users should be generated during a performance test.

• It is calculated by dividing the total number of transactions by the duration of the test.

• For example, if the test is scheduled to run for 1 hour and the expected number of transactions is 10,000, the pacing time...read more
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Q3. Explain 3-tier architecture?
Ans. 
3-tier architecture is a client-server architecture with three layers: presentation, application, and data storage.
• Presentation layer: User interface for interaction with the application

• Application layer: Business logic and processing of user requests

• Data storage layer: Storage and retrieval of data

• Each layer communicates with the layer above and below it

• Allows for scalability and separation of concerns

• Examples: Web ap
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Q4. What is difference between concurrent users and simultaneous users?
Ans. 
Concurrent users and simultaneous users are often used interchangeably, but they have different meanings.
• Concurrent users refer to the number of users accessing the system at the same time.

• Simultaneous users refer to the number of users performing the same action at the same time.

• Concurrent users can perform different actions at the same time, while simultaneous users perform the same action.

• For example, if 100 users a...read more
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Q5. How many types of graphs? Explain?
Ans. 
There are several types of graphs, including line, bar, pie, scatter, and area graphs.
• Line graphs show trends over time.

• Bar graphs compare data between different categories.

• Pie graphs show proportions of a whole.

• Scatter graphs show the relationship between two variables.

• Area graphs show the cumulative totals over time.
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Q6. What is IP Spoofing?
Ans. 
IP Spoofing is a technique used to impersonate another device by changing the source IP address of a packet.
• IP Spoofing is commonly used in DDoS attacks to hide the attacker's identity.

• It can also be used to bypass access controls by impersonating a trusted device.

• IP Spoofing can be prevented by using firewalls and network intrusion detection systems.
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Q7. What is Rendezvous point?
Ans. 
Rendezvous point is a synchronization point in load testing where multiple virtual users wait for each other before proceeding.
• Used in load testing to simulate real-world scenarios

• Ensures that all virtual users reach a certain point before continuing

• Helps in measuring the response time of the system under load

• Can be used to test scenarios like online auctions, where multiple users bid at the same time
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Q1. Just salary and joining date related questions
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