I have just taken over a network. It is physically split into two subnets because they want to protect one side from the "dumb users" on the other side. However there are a number of PCs that are multihomed to allow them to connect to both sides. Each of two NICs is physically connected to each of the two separate subnets.
QUESTION: does the multihomed PC now become a conduit for worms etc. from one side to the other? Is multihoming some PCs defeating the purpose of physically separating the networks in the first place?