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A development team has deployed a three-tier application in an OCI VCN. The application consists of a public-facing web tier, an application tier, and a database tier. The team reports that the web tier instances can communicate with the application tier instances, but the application tier instances cannot connect to the database tier instances. All security lists are configured to allow all traffic within the VCN. Which OCI Networking diagnostic tool would BEST help you quickly isolate the root cause of this connectivity issue?
Correct Answer: B
* Problem: App tier can't reach DB tier despite open security lists. * Option A: Flow Logs show traffic details but require analysis, slowing diagnosis-less efficient. * Option B: Connection Diagnostics tests connectivity (e.g., ping, traceroute) between resources, quickly pinpointing failures-correct. * Option C: Network Firewall controls traffic, not diagnoses-incorrect. * Option D: Bastion is for access, not troubleshooting-incorrect. * Conclusion: Connection Diagnostics is the best tool for quick isolation. Oracle states: * "Connection Diagnostics provides rapid testing of network connectivity between OCI resources, ideal for isolating issues like tier-to-tier failures."This validates Option B. Reference:Network Troubleshooting - Oracle Help Center(docs.oracle.com/en-us/iaas/Content/Network/Tasks /troubleshooting.htm#connectiondiagnostics).
