F5 Networks Test Engineer Interview Questions and Answers

Q1. Threading: Write and use a mutex?
Ans. 
A mutex is a synchronization primitive that ensures only one thread can access a resource at a time.
• Create a mutex object using the appropriate library or language-specific function.

• Lock the mutex before accessing the shared resource to prevent other threads from accessing it.

• Unlock the mutex after finishing the operation on the shared resource to allow other threads to access it.

• Example: pthread_mutex_t mutex; pthread...read more
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Q2. Find the memory leak in a given set of code.
Ans. 
Identify memory leak in code
• Check for any dynamically allocated memory that is not being freed

• Look for any infinite loops or recursive functions that consume memory

• Use memory profiling tools like Valgrind to detect leaks

• Check for any global variables that are not properly managed
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Logical reasoning And aptitude test

C++, python and Java programming

60 minutes. Questions related to OS, DBMS MCQs.

Q1. Technical questions related to DSA.
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Q1. General HR questions.
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The coding round had 2 coding+ 1 SQL + 8 mcqs bon OS and networking. I was able to solve all.

Q1. Find unique and duplicate elements in an array.
Ans. 
To find unique and duplicate elements in an array.
• Create two empty arrays, one for unique elements and one for duplicates.

• Loop through the array and check if the element is already in the unique array.

• If it is, add it to the duplicates array. If not, add it to the unique array.

• Return both arrays.
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Q2. Implementation of all linked list operations from scratch and reverse it.
Ans. 
Implementing all linked list operations from scratch and reversing it.
• Start by creating a Node class with data and next pointer

• Implement insert, delete, search, and traverse operations

• To reverse the linked list, use three pointers to reverse the direction of the links

• Make sure to handle edge cases such as empty list and single node list
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Q3. File handling question.
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Q4. SQL question to find third highest salary.
Ans. 
SQL query to find third highest salary.
• Use ORDER BY and LIMIT to get the third highest salary.

• Use subquery to avoid duplicates in case of multiple employees having same salary.

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 2,1;
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Q1. Was asked about academics.
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Q2. Types of inter process communication.
Ans. 
Inter process communication (IPC) allows processes to communicate with each other and share resources.
• Shared memory

• Pipes

• Sockets

• Message queues

• Signals
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Q3. Linux based questions
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Q4. System design question to design an app like Twitter by drawing block diagram.
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Q1. Describe yourself apart from resume.
Ans. 
I am a passionate software engineer with a strong background in developing scalable and efficient applications.
• Proficient in multiple programming languages such as Java, Python, and C++

• Experienced in developing web applications using frameworks like Spring and Django

• Familiar with database management systems like MySQL and MongoDB

• Strong problem-solving and analytical skills

• Excellent communication and teamwork abilities
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Q2. Tell me about weakness.
Ans. 
I tend to be overly critical of my own work.
• I have a tendency to be too self-critical and strive for perfection.

• I often spend more time than necessary on a task to ensure it meets my high standards.

• I sometimes struggle with accepting constructive criticism and can take it personally.

• I am actively working on improving my ability to recognize and appreciate my own accomplishments.
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Q3. If u are placed urself in a company how would you introduce yourself to the team.
Ans. 
I would introduce myself to the team by sharing my background, skills, and enthusiasm for software engineering.
• Start by sharing your name and a brief overview of your professional background.

• Highlight your technical skills and experience in software engineering.

• Express your enthusiasm for the field and your eagerness to contribute to the team.

• Mention any relevant projects or achievements that demonstrate your abilities...read more
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Q4. Was asked about where I live. It was just a 5 mins round.
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Hiring assessment of total 75 minutes

Q1. Some os related questions
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Q2. Some basic networking questions
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2 Coding questions, 1 SQL and a few MCQs.

Q1. Given a String find the lexicographically lowest substring containing k number of 1s
Ans. 
Find the lexicographically lowest substring with k 1s in a given string.
• Iterate through the string and maintain a sliding window of size k.

• Keep track of the count of 1s in the window and update the result if a valid substring is found.

• Return the lexicographically lowest substring with k 1s.
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Q2. Given to solve SQL Questions based on Join and group by.
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Q1. Technical Discussion
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Q2. Questions based on operating Systema and OOPs
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Q3. Difference between Abstract class and interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract for cl...read more
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Q4. Process Synchronisation
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Q5. Was asked what project would I take up if I get funded and list the challenges of taking up the project.
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Q1. Just Basic HR Questions
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