TestOut LabSim A+ Certification Practice Exam

In a SCSI bus configuration, where should termination be enabled?

1. On the middle hard disk drive

2. On the DVD drive and the external tape drive

3. Only on the external tape drive

4. On the SCSI adapter

The correct answer is: On the DVD drive and the external tape drive

In a SCSI bus configuration, termination is crucial for maintaining signal integrity and preventing data corruption on the bus. Termination must be enabled at the correct points within the SCSI chain. The appropriate locations for termination are at both ends of the SCSI bus. This means that the last device on the bus—whether it’s a drive or an external device—needs to have termination enabled to absorb the signal reflections that occur when data signals reach the end of the cable and cannot go any further. In the case of the DVD drive and the external tape drive, if these are the last devices in the SCSI chain, they should each have termination enabled. The middle hard disk drive should not have termination enabled, as it is not at the ends of the bus. Termination on the SCSI adapter is not ideal since the adapter itself does not act as a terminator in the same sense as devices; its main role is to interface the SCSI bus with the system. Thus, enabling termination on the DVD drive and the external tape drive is appropriate because they represent the endpoints of the SCSI bus configuration, ensuring proper signal management.