Managed switch is one thing, why would a standard switch even have an admin panel or anything controlling over the network? I can sniff my internal network via the router's switch.
I think a little more specific clarification is needed to discuss the depth's of sniffing.
And the OP's question might need explaining more, as there is a yes/no type answer to the question. Yes a VM will allow sniffed traffic. Will it allow all traffic to be sniffed? Depends on the network. Hence my comment initially on what is the network we are referring to from the OP, it is too broad a comment I'd think to give an exacting reply. Call me pedantic.
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