A station can be a stacking station for at most two priority levels. Any station may become the active monitor. Highest priority frames may be transmitted by a station even if its THT has reached zero. Within a given priority level, all stations have equal opportunity to transmit frames. Questions 6-11 refer to 802.3 6.
Every station reads every frame transmitted.
The backoff procedure on collisions guarantees that no station will be starved. Ethernet and 802.3 differ by one field in the header. Every station that senses a collision, sends a jam signal. If an ack is not received within a specified time, a retransmission occurs. Virtual circuits are a type of circuit switching.