_________ Communication mode allows communication in both directions simultaneously.

The correct answer is Full duplex

Key PointsThe Transmission mode is divided into three categories:

• Simplex mode
  • In Simplex mode, the communication is unidirectional, i.e., the data flow in one direction. The radio station is an example of simplex channel  
• Half-duplex mode
  • In a Half-duplex channel, direction can be reversed, i.e., the station can transmit and receive the data as well but only one direction at a time. A Walkie-talkie is an example of the Half-duplex mode.
• Full-duplex mode
  • In Full duplex mode, the communication is bi-directional, i.e., the data flow in both the directions. Example of the full-duplex mode is a telephone network.