200-150 Question #172: Real Exam Question with Answer & Explanation

The correct answer is B: iSCSI. iSCSI (Internet SCSI) encapsulates SCSI block storage commands inside TCP/IP packets. Because it rides on standard IP networking, it can traverse LANs, WANs, and the public internet - making it distance-unlimited in theory, constrained only by latency and bandwidth of the underly

Cisco Data Center Storage

Question

Which block storage protocol can be used over unlimited distance?

Options

ASMB
BiSCSI
CFibre Channel
DFCoE

Explanation

iSCSI (Internet SCSI) encapsulates SCSI block storage commands inside TCP/IP packets. Because it rides on standard IP networking, it can traverse LANs, WANs, and the public internet - making it distance-unlimited in theory, constrained only by latency and bandwidth of the underlying network. Fibre Channel (C) is typically confined to storage area networks within or between nearby data centers due to distance limitations of optical fiber runs and protocol overhead. FCoE (D) encapsulates Fibre Channel over Ethernet and is a data-center-local technology. SMB (A) is a file-sharing (NAS) protocol, not a block storage protocol at all - it operates at the file system level, not the block level.

Topics

#iSCSI#block storage protocols#distance limitations#storage over IP

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