• Wire or cable.
• Radio Waves (possibly with retransmitting relay towers)

passive

A zombiesat is an out-of-control satellite which cannot maintain its original orbit but remains capable of retransmitting any signal it receives.

Yes, but it's easier to use a repeater:

1. Repeaters are designed to boost weak signals by receiving and retransmitting,

2. Repeaters are cheaper,

3. Repeaters are easier to set up and use.

Since there is no option given, we will just provide three statement that can identify the role of intermediary devices. Its three roles on the network are: determination of data pathways, data signal retiming and retransmitting, and data flow management.