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This question is about senior system administrator.
The best certification for a system administrator is the Microsoft Certified Solutions Expert (MCSE) certification. However, there are a number of well-respected professional certifications that a person can pursue in this field that will make them a desirable candidate for a role as a system administrator.
The Microsoft Certified Solutions Expert (MCSE) is the top Microsoft certification. MCSE credentials are available across five solution tracks: productivity, mobility, data management, and analytics, business applications, and cloud platform and infrastructure.
The MCSE Cloud Platform and Infrastructure credential is ideal for system administrators and security analysts. It validates a candidate's skill and technical expertise in data centers, networking, storage, systems management, and virtualization.
This credential builds on the skills attained at the Microsoft Certified Solutions Associate (MCSA) level, a Microsoft certification designed for system administrators and helpdesk support professionals. Therefore, candidates must earn an MCSA certification before attempting the MCSE Cloud Platform and Infrastructure exam.
Other common certifications for a system administrator include:
The Red Hat Certified System Administrator (RHCSA) and the Red Hat Certified Engineer (RHCE) certifications
The CompTIA Infrastructure Career Pathway, which begins with core skills certifications and culminates in three advanced infrastructure-specific credentials: Server+, Linux+, and Cloud+
ServiceNow Certified System Administrator, which maintains a full complement of certifications to support its robust product portfolio.

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