Final answer:
TDMA and FDMA are cellular network technologies that do not allow channel-sharing, as they allocate specific time slots and frequency bands to individual users.
Step-by-step explanation:
The cellular network that doesn't allow users to share a single channel operates on a Time Division Multiple Access (TDMA) or Frequency Division Multiple Access (FDMA) technology. In these types of networks, each user is assigned a specific time slot or frequency band, respectively. This is different from Code Division Multiple Access (CDMA) technology where multiple users can share the same channel at the same time, as every user’s data is encoded with a unique code. The exclusivity in channels seen in TDMA and FDMA ensures that there is no overlap or sharing of channels between multiple users, which can reduce interference but also limit the maximum number of users.