Certified Information Systems Security Professional (CISSP) — Question 277

An organization has requested storage area network (SAN) disks for a new project. What Redundant Array of Independent Disks (RAID) level provides the BEST redundancy and fault tolerance?

Answer options

• A. RAID level 1
• B. RAID level 3
• C. RAID level 4
• D. RAID level 5

Correct answer: D

Explanation

RAID level 5 provides the best redundancy and fault tolerance among the options because it uses striping with parity, allowing data recovery in case of a single disk failure. RAID level 1 offers mirroring but requires double the storage for redundancy, while RAID levels 3 and 4 are less efficient in redundancy and performance compared to RAID 5.