Which network topology is considered passive?

Bus Cross Ring Star

Which layer adds a header to the packet coming from the upper layer that includes the logical addresses of the sender and receiver?

Network Physical Data Link Transport

Which is the physical path over which a message travels?

Medium Protocol Signal Transmission

In which connection, two and only two devices are connected by a dedicated link?

point-to-point multipoint primary secondary

The largest portion of the bandwidth for ADSL carries:

voice communication upstream data downstream data control data