Tell us about a time when you had to troubleshoot a network issue. How did you identify the problem and find a resolution?

During my time as a Network Engineer at XYZ Company, I encountered a network issue that affected the connectivity of multiple branches. To identify the problem, I started by checking the network devices and configurations. I discovered that there was a misconfiguration in the routing tables which was causing the packets to be dropped. After identifying the problem, I worked with the team to find a resolution. We updated the routing tables and performed tests to ensure that the network was functioning properly again.

As a Senior Site Reliability Engineer, I have had several experiences troubleshooting network issues. One particular instance was when we faced a connectivity problem between our data center and a remote office. To identify the problem, I first conducted a thorough analysis of the network infrastructure, including switches, routers, and firewalls. I also reviewed the network configurations and logs to pinpoint any anomalies. After extensive investigation, I discovered that there was a faulty network cable causing intermittent connectivity issues. To resolve the problem, I promptly replaced the faulty cable and reestablished the network connection. To prevent future occurrences, I implemented network monitoring tools to proactively detect any network anomalies and developed automated scripts to monitor network performance.

In my role as a Senior Site Reliability Engineer at XYZ Company, I encountered a complex network issue that affected the performance and availability of our services. Multiple teams were involved, including network operations, application development, and database administration. To identify the problem, I led a collaborative troubleshooting session, bringing together experts from each team. We conducted a series of tests and analysis, including packet captures, performance monitoring, and log analysis. Through this process, we discovered that the issue was caused by a misconfigured load balancer, which was causing uneven distribution of traffic. We immediately reconfigured the load balancer and performed extensive testing to verify the resolution. To prevent similar issues in the future, I developed a comprehensive monitoring and alerting system, leveraging the company's existing APM tools and integrating it with our CI/CD pipeline. This allowed us to proactively detect and resolve any network issues before they impacted our services.