The LPIC-3 Exam 300, also known as the LPIC-3 Mixed Environments exam, is the pinnacle of the multi-level professional certification program by the Linux Professional Institute (LPI). This certification is designed for enterprise-level Linux professionals and represents the highest level of professional, distribution-neutral Linux certification within the industry. To receive the LPIC-3 Mixed Environments certification, candidates must already hold an active LPIC-2 certification. The exam, denoted as 300-300, is a 90-minute assessment consisting of 60 multiple-choice and fill-in-the-blank questions. The validity period for the certification is 5 years​ .

The exam voucher for LPIC-3 Exam 300 is priced at USD $200. However, pricing can vary depending on the region and available discounts. It is essential to check for the most accurate and up-to-date pricing in your specific country​ .

The exam covers a wide range of topics, including but not limited to backup and recovery strategies for Active Directory domain controllers, the impact of virtualization on Active Directory domain controllers, troubleshooting Samba issues, configuring Samba as an Active Directory domain controller, Active Directory user management, and Samba domain membership. Candidates will need to be proficient with a variety of tools and utilities, such as systemctl, smbcontrol, samba-tool, and many others, to successfully pass the exam​ ​.