Load Balancer Interview Questions

The optimal performance of web applications and other software types depends mainly on load balancing. Professional programmers and coders use various load-balancing strategies and algorithms to distribute user data evenly across several servers. Having a good understanding of load balancing and effectively answering load balancer interview questions can significantly increase your chances of getting hired.

What are the main load-balancing techniques?

Hiring managers use this quiz to evaluate candidates’ familiarity with load balancing. Please briefly explain the various methods and the circumstances in which they would be most useful rather than just listing them all. Discussing the most crucial strategies and how they vary is a terrific way to show the interviewer why you’re the best candidate for the position.

What is the function of a reverse proxy service?

This load balancer interview question could potentially be asked at some point during the interview. The inquiry is intended to test your knowledge of the technical details of load balancing. Take some time to consider this topic and provide a well-written response if you are asked it. Briefly describe what you mean by the reverse proxy server and what it performs.

What is load balancing failover?

Put your knowledge of the load-balancing technique to the test with this quiz. Potential employers may pose this inquiry. The recruiting manager could be persuaded of your qualifications by your response. It would be helpful if you also pointed out the many ways in which load balancers might malfunction.

Sticky session load balancing and affinity-what are they?

The interviewers want to see whether you can follow the procedure steps without being prompted. Discuss the similarities and differences between sticky sessions and session preferences in your response.

What is a TCP load balancer?

This is a famous test evaluating a candidate’s familiarity with the various load balancers on the market. Make sure your answer is concise and straightforward to comprehend.

What is a round-robin load balancing Benefit?

This test is designed to evaluate your multitasking skills. Candidates with experience in this area may be expected to be familiar with the advantages of round-robin load balancing, the most basic and widely used method. Remember to highlight the most valuable benefits in your response to this question.

What effect does Secure Sockets Layer (SSL) have on load balancing?

Since this is a technological problem, many individuals likely can assist with finding a solution. Your chances of winning the job improve if you respond honestly and compellingly to this question. Do your best to compose a coherent response. You can begin by defining SSL and discuss its impact on load balancing.

What is IP address affinity load balancing?

Another vital method of load distribution is the IP address affinity strategy. Employers commonly use this question to gauge a candidate’s grasp of the many methods available for delegating tasks. Please describe the procedures in your answer.

How to Design a Load Balancer?

This how to design a load balancer interview question is one of the most asked questions by the recruiters. However, when faced with a question like that, one can fumble. But there’s no need to hesitate when you’re asked how to design a load balancer in an interview.

Here is an easy answer to this how to design a load balancer interview question:

To provide effective and dependable distribution of incoming network traffic among numerous servers, a load balancer’s design requires a number of factors. The main stages in designing a load balancer are as follows:

  1. Recognise the particular specifications of your system, such as the anticipated traffic volume, application kinds, session persistence needs, and scalability requirements. This information will influence your selections about load balancer design.
  1. Based on your needs, pick a suitable load-balancing method. Round-robin, least connections, weighted round-robin, IP hash, and other popular algorithms are included here. Each algorithm is appropriate for a particular circumstance and has unique properties.
  1. Choose a load balancer’s location inside your network architecture. It may be positioned inside the server architecture (back-end load balancing) or between the clients and servers (front-end load balancing). Think about elements including application design, network architecture, and security specifications.
  1. Decide which load balancer type best suits your requirements. There are three types of load balancers: cloud-based, software, and hardware. Software load balancers operate on general-purpose servers or virtual machines, while hardware load balancers are actual physical devices devoted to load balancing. Cloud service companies provide cloud-based load balancers as a service.
  1. Establish a scaling strategy and consider how your load balancer will respond when your application or traffic increases. This might include expanding the load balancer’s server infrastructure, scaling up the load balancer itself, or using the auto-scaling features cloud computing platforms offer.
  1. Use health checks to monitor the functionality and condition of the backend servers. Server requests are regularly sent to them by the load balancer, eliminating any unresponsive or unhealthy servers from the rotation.
  1. Choose a solution if your application needs session persistence (for example, to retain user sessions). You may choose to route future requests from the same client to the same server by utilizing server affinity (sticky sessions), cookies or by including session IDs in URLs.
  1. Take into account putting redundancy and failover methods into place to guarantee dependability. If a server or load balancer fails, you may employ additional load balancers in active-passive or active-active setups with methods for automated failover.
  1. Create the load balancer with security in mind. To safeguard against possible risks and guarantee the confidentiality and integrity of the communication, implement mechanisms like SSL/TLS termination, access limits, and rate limitations.
  1. Establish monitoring and logging capabilities to understand the load balancer’s performance better and to help you fine-tune it. Monitor the system constantly, gather performance data, and adjust the load-balancing setup as necessary.

Advice on how to be ready for load-balancing queries. 

Here are some guidelines to help you respond appropriately to load balancer interview questions:


The best load balancer interview questions are answered here, making it easier to ace the test. We have design a load balancer interview questions which will help you to answer the load balancer questions in the interview. Load balancing is crucial in ensuring the optimal performance of applications and websites. Round-robin, sticky sessions, and TCP load balancing are just a few of the various techniques at its disposal. Candidates must be well-versed in IP address affinity, session affinity, SSL effects, and load-balancing failures on reverse proxy servers. Candidates who want to excel in load-balancing discussions should devote significant time to preparation, practice, and mock interviews. Those with extensive knowledge of load-balancing concepts and techniques will stand out from the competition.

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Myself Bharath Choudhary, software developer at Oracle.
2021 NIT Warangal graduate.


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