Final answer:
To check if the received CRC code 1000110 is legal with key 1011, perform binary division. The remainder determines if the code is legal.
Step-by-step explanation:
The given question involves the calculation of a CRC code. CRC stands for Cyclic Redundancy Check, which is an error-detecting code commonly used in digital networks and storage devices.
To check if the received CRC code 1000110 is legal with key 1011, we perform a CRC calculation. Divide the received code by the key using binary division. If there is no remainder, then the received code is legal; otherwise, it is not.
In this case, carrying out the binary division, we find that the remainder is 000, which means the received CRC code 1000110 is legal with key 1011.