In ClusterXL, _______ is defined by default as a critical device. 05/30/2017 – by Mod_GuideK 0 In ClusterXL, _______ is defined by default as a critical device. A. fw.d B. vpnd C. Filter D. cpd SHOW ANSWERSCorrect Answer: C Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.