Connection Troubleshoot is correct because it performs an end to end connectivity check between the two endpoints and reports whether user defined routes or network security groups are preventing the traffic.

The Connection Troubleshoot feature initiates a simulated connection from the source to the destination and traces the network path. It returns the result and indicates the hop where traffic is dropped and whether an NSG rule or a user defined route is the cause. This direct path analysis is why Connection Troubleshoot is the right choice to diagnose why two Linux virtual machines in the same virtual network cannot communicate.

Packet Capture is incorrect because it only captures packets on a VM for later analysis and it does not perform an end to end connectivity test that will explicitly show which route or security rule blocked the traffic.

Network Performance Monitor is incorrect because it focuses on ongoing performance and latency monitoring across networks and it is not the interactive diagnostic that shows the path and the specific rule or route that denies a connection.

IP Flow Verify is incorrect because it checks whether a specific flow is allowed or denied on a VM network interface based on NSG rules. While IP Flow Verify is useful for validating NSG rule effects at the NIC level it does not perform the broader multi-hop path trace that reveals route table impacts across the path in the same way as Connection Troubleshoot.

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