Which Type of Data Communication Is Followed by the Data Link Layer?


Angela Bailey

The data link layer, which is the second layer of the OSI model, plays a crucial role in establishing reliable communication between devices on a network. It provides the necessary means for transmitting data over a physical link.

But what type of data communication does the data link layer follow? Let’s delve deeper into this topic.

Data Link Layer:
The data link layer primarily focuses on framing data packets received from the network layer into manageable units, known as frames. These frames encapsulate the data along with control information required for error detection and correction. The primary goal of the data link layer is to ensure reliable transmission over a physical link.

Types of Data Communication:

There are two main types of data communication followed by the data link layer: simplex and full-duplex. Let’s explore each type in detail.

1. Simplex Communication:

Simplex communication is a unidirectional mode of communication where data flows in only one direction, either from the sender to the receiver or vice versa. In this mode, one device acts as a transmitter while the other acts as a receiver.

  • Example: A television broadcasting system.
  • Characteristics:
    • Data flows in only one direction.
    • The sender does not expect any acknowledgment or response from the receiver.
    • The receiver cannot send any feedback or response to the sender.

2. Full-Duplex Communication:

Full-duplex communication allows for simultaneous bidirectional transmission between sender and receiver. Unlike simplex communication, both devices can transmit and receive data simultaneously.

  • Example: A telephone conversation.
  • Characteristics:
    • Data flows in both directions simultaneously.
    • Both the sender and receiver can transmit and receive data at the same time.
    • It provides a more efficient and interactive mode of communication.


In conclusion, the data link layer adopts two types of data communication: simplex and full-duplex. Simplex communication involves unidirectional data flow, while full-duplex communication allows for simultaneous bidirectional transmission. Understanding these modes of communication is essential for designing efficient and reliable networks.

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