Answer: The size of an ATM cell including the header is 53 bytes.
What is an ATM cell?
ATM (Asynchronous Transfer Mode) is a network technology that transmits data in fixed-size cells called packets or cells. These cells are of a uniform size of 53 bytes, which includes the 5-byte header and the 48-byte payload.
Why is the size of ATM cells fixed?
The size of ATM cells is fixed to provide faster and more efficient data transmission. With a fixed-size cell, the data can be switched more quickly, and there is less delay in the network. Additionally, ATM technology supports both voice and data transmissions, so a fixed-size cell ensures that all types of information are transmitted at the same rate.