ITPEC FE Morning October 2020 Question 15
Source exam: ITPEC FE Morning October 2020Topic: Computer Systems & Hardware
ITPEC FE Morning October 2020 — Question 15 of 80
RAID Levels — RAID 1 achieves data redundancy via mirroring.
RAID levels overview:
- •RAID 0 — striping only, no redundancy; data split across disks for speed
- •RAID 1 — mirroring; data duplicated on two disks (exact copy)
- •RAID 5 — striping + distributed parity; tolerates 1 disk failure
- •RAID 6 — striping + double parity; tolerates 2 disk failures
Why (b) is correct:
- Mirroring = writing identical data to two disks
- Only RAID 1 uses this method
Why not others:
- (a) RAID 0 — striping only, zero redundancy
- (c) RAID 5 — uses parity, not mirroring
- (d) RAID 6 — uses double parity, not mirroring
Key rule: RAID 1 = mirror (1 copy). RAID 5/6 = parity-based redundancy.
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