An entire compliance scan or audit is different from a typical vulnerability scan; it is completely dependent on the plugins and the Nessus audit file. We have already covered the basics on how to download and update the plugins in Chapter 2, Understanding Network Scanning Tools. We will now uncover further details about plugins and the Nessus audit file. In this recipe, we will look how to select the correct baseline policy from the set of policies that come preloaded in Nessus, in order to perform a configuration audit for a Linux host.