SK0-004 · Question #631
During a power outage, the battery on the server motherboard is used to:
The correct answer is D. keep the CMOS information. The CMOS battery on a server motherboard provides continuous low-level power to the CMOS chip, which stores BIOS settings such as system time, hardware configuration, and boot order when main power is absent.
Question
During a power outage, the battery on the server motherboard is used to:
Options
- Akeep the NIC information
- Bpower the server in case main power is disconnected
- Cpower the RAM
- Dkeep the CMOS information
How the community answered
(60 responses)- A2% (1)
- B3% (2)
- C7% (4)
- D88% (53)
Why each option
The CMOS battery on a server motherboard provides continuous low-level power to the CMOS chip, which stores BIOS settings such as system time, hardware configuration, and boot order when main power is absent.
NIC information such as MAC addresses is burned into non-volatile firmware on the network adapter itself and does not rely on the CMOS battery for retention.
The CMOS battery is a small coin-cell with milliamp-hour capacity, far too limited to power an entire server - that function is served by a UPS or backup generator.
RAM is volatile memory that requires constant main system power to retain data and cannot be sustained by the low-capacity CMOS battery.
The CMOS chip is a small non-volatile storage component that holds BIOS configuration data including the real-time clock, hardware settings, and boot order. The onboard coin-cell battery (typically CR2032) keeps this chip powered continuously so these settings survive power outages or server shutdowns without needing to be reconfigured.
Concept tested: CMOS battery role in preserving BIOS settings
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