ISC301Xuất hiện trong 1 đề thi
All of the following about wireless wide area networks (WWAN) are true EXCEPT:
Các lựa chọn
AThe single WWAN network standard ensures compatibility of handsets within and between countries.
BMost WWANs are cellular phone networks.
CAt the center of each cell is a base station transceiver or cell tower that is used to send and receive signals to and from mobile devices operating within the cell.
DWhen a device is turned on, a SIM card inside the device identifies itself to the WWAN.