Multiple choice technology operating systems

Which SCSI Layer was not defined in SCSI-1

  1. Application Layer

  2. Programming Interface Layer

  3. SCSI Command Layer

  4. SCSI Protocol Layer
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B Correct answer
Explanation

SCSI-1 defined three primary layers: Application Layer (initiates commands), SCSI Command Layer (encapsulates CDBs), and SCSI Protocol Layer (handles signaling). The Programming Interface Layer was NOT formally defined in SCSI-1. This layer, which provides standardized APIs for applications to interact with SCSI devices, was introduced in later SCSI specifications (SCSI-2 and beyond). SCSI-1 focused on basic command and protocol definitions without formal programming interface standards.

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