What is the function of the preamble in the Ethernet protocol?

What is the function of the preamble in the Ethernet protocol?

• A. To indicate frame size
• B. To signal the start of a frame and synchronize clocks
• C. To carry error-checking information
• D. To encode the destination address

Answer: (B)

The preamble in the Ethernet protocol plays a crucial role in preparing the receiving device to process an incoming frame. Its primary function is to signal the start of a frame and synchronize the clocks of the transmitting and receiving devices. The preamble consists of a sequence of bits that allows the receiving device to detect the beginning of the frame, providing it with a means to align its internal clock with the sender's signal. This synchronization is essential for accurately interpreting the data that follows the preamble. By using the preamble effectively, Ethernet ensures that frames are transmitted and received accurately, reducing the likelihood of errors during communication. This functionality is foundational to maintaining reliable data transmissions over a network.

The preamble in the Ethernet protocol plays a crucial role in preparing the receiving device to process an incoming frame. Its primary function is to signal the start of a frame and synchronize the clocks of the transmitting and receiving devices. The preamble consists of a sequence of bits that allows the receiving device to detect the beginning of the frame, providing it with a means to align its internal clock with the sender's signal. This synchronization is essential for accurately interpreting the data that follows the preamble.

By using the preamble effectively, Ethernet ensures that frames are transmitted and received accurately, reducing the likelihood of errors during communication. This functionality is foundational to maintaining reliable data transmissions over a network.