Which of the following is not a layer of the SCSI Initiator Model?

• A. SCSI Link Layer
• B. SCSI Network Layer
• C. SCSI Network Layer
• D. SCSI Device Driver Layer

Answer: (B)

Understanding how the SCSI Initiator Model is structured helps explain why a Network Layer isn’t part of it. The initiator’s responsibilities stack up in a few defined layers: the Link Layer handles the actual SCSI bus signaling and device addressing on the physical connection; the Device Driver Layer sits in the operating system, translating OS I/O requests into SCSI commands and managing resources; and there’s typically a middle layer (often called the transport or protocol layer) that coordinates command sequencing and data transfer between the driver and the link. Networking concepts aren’t defined as a layer within this model—networking sits outside SCSI, with technologies like iSCSI carrying SCSI commands over IP networks rather than inside the SCSI Initiator Model itself. So a Network Layer is not a recognized layer of the SCSI Initiator Model, making that option the correct choice.