Written by Chris on a previous post on here: The implementations of the standard CRC algorithms are certainly not examinable, and Labsheet-1 reinforced this by only treating the CRCs as 'black-boxes', which we called as functions, and they returned a result. You should know what CRCs are, why they are useful, why the more-complex ones are better than the simpler ones (Labsheet-1), and their limitations.