A system administrator is troubleshooting a connectivity issue with a CMC module. Which connection method should they use if wired Ethernet is not possible?

In situations where wired Ethernet connections are not feasible, utilizing a serial connection can be a practical alternative for troubleshooting connectivity issues with a Chassis Management Controller (CMC) module. Serial connections are often employed in scenarios requiring direct interaction with hardware, specifically in environments like data centers where administrators need to configure or troubleshoot systems with minimal network dependencies.

Serial communication provides a reliable method for establishing console access to the CMC, allowing the administrator to work through command-line interfaces directly. It offers the advantage of bypassing network-related issues that might impede connectivity, enabling direct interaction with the CMC's management features.

While other options like wireless connectivity or SSH might seem viable, they introduce additional layers of complexity and potential troubleshooting challenges that could stem from the underlying network configuration or availability. Therefore, a direct serial connection stands out as a robust and straightforward method to access the CMC module without relying on a functioning Ethernet network.