AdvancedTechnical
5 min
Advanced Network Troubleshooting in Cloud Environments
NetworkingCloudTroubleshooting
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Interview Question
Your workloads face intermittent connectivity failures across regions. Walk through your diagnostic and remediation approach.
Key Points to Cover
- Check VPC routes, peering, and security groups
- Analyze packet flow with VPC flow logs or tcpdump
- Use traceroute/mtr to identify latency spikes or drops
- Simulate cross-region failures using chaos testing
Evaluation Rubric
Collects and analyzes relevant network data30% weight
Identifies cause of intermittent failures30% weight
Provides resolution strategies20% weight
Improves future network resilience20% weight
Hints
- 💡Inspect routing tables, security policies, and service mesh configs.
Common Pitfalls to Avoid
- ⚠️Focusing solely on instance-level troubleshooting without examining broader VPC configurations.
- ⚠️Neglecting to analyze actual packet flow with tools like Flow Logs or tcpdump.
- ⚠️Not systematically checking all layers of the network stack, from routing to security.
- ⚠️Assuming the issue is always within the customer's direct control, overlooking cloud provider infrastructure problems.
- ⚠️Implementing fixes without verifying the root cause, leading to recurring issues.
Potential Follow-up Questions
- ❓How would you simulate failovers?
- ❓What metrics would you monitor continuously?
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