Tax data
In contrast to user data , control data refers to additional auxiliary information of a file format, transmission protocol (see below) or the like, which is used for synchronization, structuring, etc.
Log data
As log data , the control data of a protocol referred that to ensure the communication necessary between receiver and transmitter. Log data can be structured very differently depending on the layer of the OSI reference model in which they are located.
The relationship between the total information transmitted and the protocol data is called overhead information . The highest possible proportion of useful data , that is to say the smallest possible proportion of protocol information , is economically favorable . However, this often runs counter to the requirement to securely transmit data within a protocol (see UDP and TCP ).