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Enabling Promiscuous Mode on the relevant port group is the correct setting to adjust when an administrator cannot see expected network traffic in the packet capture tool. In a standard network configuration, network interfaces are typically set to receive only the traffic intended for them based on the destination MAC address. When Promiscuous Mode is enabled on a port group, it allows the network interface to capture all network traffic on the segment, regardless of the destination address. This is particularly useful for network monitoring or troubleshooting, as it provides visibility into all traffic flowing through that port group.

In scenarios where packet capture tools are in use, having Promiscuous Mode enabled ensures that the tool can analyze not only the traffic destined for the virtual machine but all traffic that is present on that VLAN or network segment. This can reveal important interactions, such as broadcast messages or traffic to and from other virtual machines, which would normally be invisible if the mode were not enabled.

To ensure comprehensive packet analysis, this setting is essential in gathering the needed data for effective network troubleshooting or monitoring within a VMware environment.