True or false and explain answer

1)Multiple-access protocol is needed to access the link in the shared networks.

2)Layered architecture is required for data communication models

3)For Go-Back- N flow and error control of sequence number bits m=2, the sender window size cannot be more than 4.

4)In Bluetooth piconet, activating a station from the parked state means that an active station must go to the parked state

5)Reverse address resolution protocol can not be used for diskless IP machine

6)ACL Bluetooth link is used when data integrity is needed

7)The frame header for a wireless LAN, IEEE 802.11, has two address fields

8)For slotted ALOHA, the vulnerable time=2*T frame while in pure ALOHA, vulnerable time=T frame

9)Star network topology is less expensive than mesh network topology.

note: I need answer within 15 min please help me

subject : network