The answers that are provided for each of the end-of-chapter questions are designed to expand your understanding of the subject matter. The rationale presents knowledge that is just beyond the 210-255 exam scope, because it is this knowledge that a prospective cybersecurity operator should be striving for.
Some of the rationale and specific examples are not covered directly in this book; there are elements where judgment calls need to be applied, and this will come with practice. The 210-255 exam may well provide examples that aren't in this or any other book; this is the idea – to keep the value of the certification, the questions are held secretly within a tight circle. The idea behind the questions here – and in the mock and the actual 210-255 exam – is to test understanding rather than memorization. Sometimes, an answer will reveal itself...
