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Using the ping command is essential for diagnosing network connectivity issues, including inter-VLAN communication. When you ping an IP address in a different VLAN, it sends ICMP echo-request packets to the target. If the target device responds with echo-reply packets, it indicates that routing between the VLANs is operational, allowing for successful communication.

Other commands, while useful in their own contexts, do not specifically test inter-VLAN communication in the same direct manner. For example, ipconfig displays network configuration settings on a local device, which does not provide information about the connectivity status between different VLANs. The show VLAN command reveals the VLAN configuration but does not test connectivity, and the show interface command presents the status of router or switch interfaces, including their configurations, but does not conduct a connectivity test between VLANs. Therefore, the ping command is the most effective tool for determining if inter-VLAN communication is functioning.