SK0-003 · Question #917
Which of the following is true about devices on a narrow SCSI chain?
The correct answer is A. Each device must have a different ID. Each device on a narrow SCSI chain must have a unique ID to allow the host adapter to communicate with it individually and prevent addressing conflicts.
Question
Which of the following is true about devices on a narrow SCSI chain?
Options
- AEach device must have a different ID
- BThe higher the ID number the higher the priority
- CAll devices must have the same ID
- DHard drives must be assigned an even number ID
How the community answered
(25 responses)- A96% (24)
- C4% (1)
Why each option
Each device on a narrow SCSI chain must have a unique ID to allow the host adapter to communicate with it individually and prevent addressing conflicts.
SCSI (Small Computer System Interface) architecture requires each peripheral device connected to the bus to be assigned a unique ID, typically from 0 to 7 for narrow SCSI, so the host controller can correctly identify and interact with each device.
While SCSI IDs do have a priority scheme (ID 7 typically highest), it is not a general rule that a higher ID number automatically confers higher priority for all devices on the chain.
Having all devices with the same ID would lead to address conflicts, making it impossible for the host adapter to distinguish between peripherals on the SCSI chain.
There is no technical requirement in SCSI for hard drives to be assigned specifically even-numbered IDs; any unique ID within the available range is permissible.
Concept tested: SCSI ID assignment and device identification
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