CompTIA A+ 220-901

Answer: B - Half-duplex best describes the communication on an old-fashioned walkie-talkie.

Key Takeaway: Half-duplex communication allows a device to send and receive data, but not at the same time, unlike full-duplex communication which (like a telephone) allows sending and receiving at the same instant. Latency describes the delay it takes for data to reach its destination. Duplex, by itself, does not relate to network communication.