Why are switched infrastructures safer environments than routed networks?

A.
It is more difficult to sniff traffic since the computers have virtual private connections.

B.
They are just as unsafe as nonswitched environments.

C.
The data link encryption does not permit wiretapping.

D.
Switches are more intelligent than bridges and implement security mechanisms.

Explanation:
A: Switched environments use switches to allow different network segments and/or systems to communicate. When this communication takes place, a virtual connection is set up between the communicating devices. Since it is a dedicated connection, broadcast and collision data are not available to other systems, as in an environment that uses purely bridges and routers.