There are several places where you can easily find this info. Please check which one works best for your style of using NetCrunch:
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Go to the Node Status window of the node that you are diagnosing. In the Summary tab, there is a white column in the right section of the window that lists the device type, what nodes it depends on, its MAC address, and what device and port it is connected to.
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Another way that also starts in the Node Status window, you can go to the dependencies tab to see the physical connection detail of the node. If you have enabled Physical Segments, you can also directly go to the physical segment view where this node is included - by scrolling a bit down in the Dependencies tab.
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If you need to have a quick glance at the connection details of multiple nodes, you can do it in the Nodes tab for any view in the 'Connected to' column. If this column is not there by default, use the gear icon in the top left of the table -> Customize -> Column Chooser and drag the selected Connected to column from the list to the view. If you prefer more granular info, you can drag the 'Switch' and 'Port' columns to the view instead.