Computer Network Basics Questions Long
Half-duplex and full-duplex are two different modes of communication in computer networks. The main difference between them lies in the direction of data flow and the ability to transmit and receive data simultaneously.
Half-duplex communication allows data transmission in both directions, but not at the same time. In this mode, two devices can take turns sending and receiving data. When one device is transmitting, the other device can only listen and wait for its turn to transmit. This mode is similar to a walkie-talkie, where only one person can speak at a time while others listen.
On the other hand, full-duplex communication enables simultaneous two-way data transmission. In this mode, both devices can transmit and receive data at the same time. It is like a telephone conversation, where both parties can speak and listen simultaneously without any interruptions. Full-duplex communication requires separate channels for transmitting and receiving data, allowing for faster and more efficient communication.
To achieve full-duplex communication, network devices such as switches and network interface cards (NICs) use techniques like collision detection and avoidance. These techniques ensure that data collisions, where two devices transmit at the same time and interfere with each other's signals, are minimized or eliminated.
In summary, the main difference between half-duplex and full-duplex communication is the ability to transmit and receive data simultaneously. Half-duplex allows data transmission in both directions but not at the same time, while full-duplex enables simultaneous two-way communication. Full-duplex communication is more efficient and faster, but it requires separate channels for transmitting and receiving data.