Which of the following represents a disadvantage of Layer 2 Channel mode?

The chosen answer highlights a significant challenge associated with Layer 2 Channel mode. In this mode, devices are configured to operate within the same LAN segment, which can lead to complex network configurations. As the network expands or becomes more complex, the risk of misconfigurations increases. Because Layer 2 Channel mode typically involves devices operating at Layer 2 of the OSI model, a mistake in this configuration can affect all devices within the same VLAN, potentially causing widespread network issues.

In contrast, options like a quicker installation time and potentially needing fewer appliances refer to operational efficiencies that Layer 2 Channel mode can provide, which are generally considered advantages rather than disadvantages. Additionally, while the lack of visibility into intra-VLAN traffic (the last option) may be seen as a limitation, it does not directly relate to the risks that arise from configuration errors in Layer 2 mode. Thus, the focus on the increased potential for configuration errors is what makes this particular choice a clear disadvantage in the context of networking operations.