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Explanation/Reference:
The components known as Serial Attached SCSI Expanders (SAS Expanders) facilitate communication between large numbers of SAS devices.
Expanders contain two or more external expander-ports. Each expander device contains at least one SAS Management Protocol target port for management and may contain SAS devices itself. For example, an expander may include a Serial SCSI Protocol target port for access to a peripheral device. An expander is not necessary to interface a SAS initiator and target but allows a single initiator to communicate with more SAS/SATA targets. A useful analogy: one can regard an expander as akin to a network switch in a network, which connects multiple systems using a single switch port.
References: https://en.wikipedia.org/wiki/Serial_Attached_SCSI#SAS_expanders www.vceplus.com - Download A+ VCE (latest) free Open VCE Exams - VCE to PDF Converter - VCE Exam Simulator - VCE Online - IT Certifications