# Operating System Hardening What minimum password length does the NSA recommends? > 12 Which of the following best describes the registry > A database containing system settings What account lockout threshold does the NSA recommend? > 3 tries What maximum password age does Microsoft recommend? > 42 days The command `sudo find / -perm -4000` checks for the location of suid binaries > True What level of privileges must all users have? > Least possible What is the rule for unused services on any computer? > Turn them off A Linux system has a repository of packages available to be installed on the system > True What type of encryption does EFS utilize? > Public key encryption > > EFS uses **symmetric key** encryption in combination with public key technology to protect files What operating system require periodic patches? > All --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://wiki.zacheller.dev/network-security/courses/isci-cnss-course/operating-system-hardening.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.