CertiGuide to A+ (Core Hardware)  9  Chapter 0101:  SCSI

XII  Chapter 0101: Test for Success Questions 1 Chapter 0110:  Removable Media

1. The maximum number of devices, not including the SCSI controller for SCSI 1 would be:

A. 2

B. 5

C. 6

D. 7

Explanation: SCSI 1 defines an 8-bit data path, which allows 8 devices, minus 1 for the controller, leaving 7 devices that can be added to the chain.

2. A LUN is used to:

A. Provide communication between two SCSI controllers

B. Sub-divide a single SCSI ID

C. Is a ‘guard-band’ frequency allocation between SCSI devices?

D. To Identify if termination is functioning

Explanation: Logical Unit Numbers (LUN) are used to sub-divide a single ID into separate channels.

3. If a SCSI device is said to be Wide is operates at:

A. 10Mb/s

B. 10MB/s

C. 5MB/s

D. 5Mb/s

Explanation: Wide SCSI allows up to 10 MB/s of data transfer to 16 devices.

4. True or False. The DB-25 connector is widely used, however is not official.

A. True

B. False

Explanation: The DB-25 connector was common in SCSI 1 implementations. Many users commonly mistook it for a parallel port connector.

5. Installing LVD SCSI on a Differential SCSI chain could:

A. Improve data access times

B. Require changing the terminator

C. Operate normally

D. Destroy the LVD device

Explanation: Low Voltage Differential devices can be severely damaged if hooked up to a High Voltage Differential chain.

6. If a jumper set were set to On/Off/On, the ID setting would be:

A. 3

B. 4

C. 5

D. 6

Explanation: A jumper block for SCSI ID is nothing more than binary settings. So, On in the 4 column, plus On in the 1 column equals 5.

7. Active termination is required for:

A. SCSI 1

B. SCSI 2

C. Ultra SCSI

D. All choices are correct

Explanation: Ultra SCSI requires active termination.

8. Tag Command Queuing was introduced with:

A. SCSI

B. SCSI 2

C. Ultra SCSI

D. All choices are correct

Explanation: Tag Command Queuing (TCQ) was introduced with SCSI 2.

9. You have been assigned the task of adding external SCSI drive to an existing server that has functioning SCSI drives operating internally. After installing the external drives, you cannot see them when you power up the server. You know they have power because you can hear them spin up. What is the most likely source of the challenge?

A. External termination is incorrect

B. Internal termination exists on the SCSI controller

C. The internal drives must be disabled

D. All choices are correct

Explanation: When external devices are added to a SCSI chain, termination needs to be moved from the SCSI controller to the last external device in the chain.

10. The default SCSI ID for a SCSI controller is:

A. 0

B. 1

C. 6

D. 7

Explanation: SCSI ID 7 is normally used by the SCSI controller. However, any ID can be used.

11. The default SCSI ID for a SCSI drive containing a bootable Operating System is:

A. 0

B. 1

C. 6

D. 7

Explanation: The boot drive of a system uses ID 0 by default. It is recommended that this default be used.

12. A SCSI SCA connector has (select all that apply):

A. Power

B. Data

C. Termination

D. LUN

Explanation: A SCSI SCA connector has both power and data for the SCSI device.

13. SCSI can be found as both 8-bit and 16 bit in what ranges of throughput:

A. 10MB to 160MB

B. 20MB to 160MB

C. 20MB to 320MB

D. 5MB to 80MB

Explanation: Current SCSI can range from 5MB/s to 80MB/s. Newer SCSI 160 and SCSI 320 will support 160MB/s and 320MB/s.

14. Maximum distance of Fast SCSI using a Single Ended drive is:

A. 1 Meter

B. 1.5 Meters

C. 3 Meters

D. 5 Meters

Explanation: The maximum distance of Fast SCSI using a SE drive is 3 meters.

15. All Ultra SCSI specifications use differential SCSI:

A. True

B. False

Explanation: Ultra SCSI always uses differential SCSI

16. LVD/MSE is a:

A. Proposed Standard

B. Multimode Specification

C. Both choices are correct

D. Neither choice is correct

Explanation: LVD/MSE is a multimode version of SCSI.

17. Cable for SE and LVD are keyed differently to avoid damage:

A. True

B. False

Explanation: Unfortunately, the only way to tell SE and LVD apart is to look at the symbols or documentation.

18. Using LVD/MSE overcomes the distance limitations of an SE drive:

A. True

B. False

Explanation: SE has a larger distance than LVD/MSE.

19. If when reading a SCSI specification, the word Wide is not mentioned, the assumption is:

A. Ultra

B. Narrow

C. Single Ended

D. Ultra 2

Explanation: Unless specified as Wide, a SCSI chain will support 8 devices.

20. Wide SCSI works ____ bits at a time:

A. 8

B. 16

C. 32

D. 64

Explanation: Wide SCSI uses 16-bits at a time, allowing for up to 16 devices per chain.

XII  Chapter 0101: Test for Success Questions 1 Chapter 0110:  Removable Media