IIInsiderInterview

Technology and Engineering · #2 in series

Site Reliability Engineer (SRE) interview prep

Top 100 interview questions for Site Reliability Engineer (SRE) — modeled on real FAANG loops.

100

Questions

10

Topics

20

Free

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System Design Networking Linux/Unix Systems Automation and Scripting Cloud Computing Reliability and Incident Management Security Performance Optimization Troubleshooting Miscellaneous

System Design

10 questions

How would you design a scalable distributed system for a URL shortener service?

Describe the architecture of a load balancer and how to implement one.

Explain how you would design a global caching system.

What considerations would you take into account when designing a high-availability database system?

How do you design a monitoring and alerting system for a large-scale application?

Explain the design of a fault-tolerant distributed file system.

How would you design a system to handle millions of concurrent users?

Discuss the design of a distributed logging infrastructure.

How would you architect a microservices-based application for scalability and reliability?

Design a system that can handle data replication across multiple data centers.

Networking

10 questions

Explain the differences between TCP and UDP.

How does DNS work, and what are some common DNS issues?

Describe how a CDN operates and its benefits.

What is BGP, and why is it important in large-scale networks?

How would you troubleshoot network latency issues in a distributed environment?

Explain the concept of subnetting and how it is useful.

Discuss network partitioning and its impact on distributed systems.

What is NAT, and how does it work?

How would you secure a network against DDoS attacks?

Explain the role of HTTP/2 in improving web performance.

Linux/Unix Systems

10 questions

How do you manage and monitor system resources on a Linux server?

Explain the process of troubleshooting a system that is running out of memory.

What is the difference between a process and a thread in Unix?

Discuss the role of systemd in modern Linux distributions.

How would you handle disk space issues on a Linux server?

Explain how you would set up and manage cron jobs.

What are cgroups and how do they help in resource management?

Describe how you would secure a Linux system.

Explain the use of the `strace` command for debugging.

How do you manage software dependencies and versions in a Unix environment?

Automation and Scripting

10 questions

How would you automate the deployment of a web application?

Explain the use of configuration management tools like Ansible, Puppet, or Chef.

Describe how you would write a script to monitor a service and restart it if it fails.

How do you ensure that your automation scripts are idempotent?

What are some best practices for writing shell scripts?

Explain the concept of Infrastructure as Code (IaC) and its benefits.

How do you automate the scaling of cloud resources?

Describe a complex task you automated using a scripting language.

How do you handle secrets and credentials in automation scripts?

Explain the role of CI/CD in modern software development.

Cloud Computing

10 questions

What are the differences between IaaS, PaaS, and SaaS?

How would you migrate an on-premise application to the cloud?

Explain the concept of cloud elasticity and how it benefits applications.

Discuss the use of containers in cloud environments.

How do you design a multi-cloud strategy?

Explain the role of serverless computing and its use cases.

How do you ensure data security in a cloud environment?

What are some challenges in managing cloud costs?

Describe how you would set up a hybrid cloud solution.

How does cloud-native application development differ from traditional approaches?

Reliability and Incident Management

10 questions

Explain the concept of an SLA and its importance.

How do you prioritize incidents in a high-pressure situation?

Describe the process of conducting a post-mortem after a major incident.

What are the key components of an effective incident response plan?

How do you measure the reliability of a system?

Explain the role of chaos engineering in improving system reliability.

How would you handle an outage in a critical system?

Describe your approach to root cause analysis.

What is the significance of MTTR and MTBF in reliability engineering?

How do you ensure effective communication during an incident?

Security

10 questions

How do you implement secure access controls for a distributed system?

Explain the importance of encryption in data security.

What are some common vulnerabilities in web applications and how do you mitigate them?

Describe the role of a firewall in network security.

How do you secure data in transit and data at rest?

Explain the concept of zero-trust security models.

How would you handle a security breach?

What is the importance of logging for security?

How do you ensure compliance with security standards in your organization?

What are some best practices for securing APIs?

Performance Optimization

10 questions

How do you identify and resolve performance bottlenecks in a system?

Explain the importance of caching in improving application performance.

What tools do you use for performance monitoring and why?

Describe your approach to optimizing database queries.

How do you ensure efficient resource utilization in a cloud environment?

What is load testing, and how do you implement it?

Explain the concept of horizontal and vertical scaling.

How do you optimize network performance for a distributed application?

Discuss the role of profiling in performance optimization.

How do you handle performance issues in a microservices architecture?

Troubleshooting

10 questions

What is your approach to troubleshooting a system that is experiencing downtime?

How do you diagnose memory leaks in an application?

Describe how you would troubleshoot a service that is not responding.

Explain your process for investigating a sudden increase in error rates.

How do you handle intermittent issues that are hard to reproduce?

Describe how you use logs for troubleshooting purposes.

What is your approach to troubleshooting network connectivity issues?

How do you ensure that your troubleshooting process is systematic and efficient?

Explain the importance of baselining in troubleshooting.

How do you use metrics to identify and resolve issues?

Miscellaneous

10 questions

How do you stay updated with the latest trends and technologies in SRE?

What is your experience with using version control systems?

How do you handle conflict resolution within a team?

Describe a challenging problem you solved in your role as an SRE.

How do you balance technical debt with new feature development?

What is your experience with using data analytics for decision-making?

How do you ensure effective collaboration with development and operations teams?

Discuss the role of documentation in maintaining system reliability.

How do you gauge the success of an SRE initiative?

What are your thoughts on the future of SRE and its evolving role in organizations?

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