CompTIA CompTIA Certifications FC0-U51 Questions & Answers

• Question 11:

  Which of the following SCSI types use 16-bit bus?

  A. Fast Wide SCSI-2

  B. Double Wide SCSI-2

  C. Fast SCSI-2

  D. Wide SCSI-2

  E. Ultra-2 SCSI (Fast-40)

  Correct Answer: AD

  The following SCSI types use 16-bit bus:

  1.Wide SCSI-2

  2.Fast Wide SCSI-2

  3.Wide Ultra SCSI-3

  4.Wide Ultra-2 SCSI

  5.Ultra-3 (Fast-80 or Ultra 160)

  Small Computer System Interface (SCSI) is the second most popular drive interface in use today after the Integrated Drive Electronics (IDE) interface. SCSI is faster than IDE and supports more devices.

  SCSI devices, such as hard disk drive and CD-ROM drive, are better suited in a network environment in which many users access shared drives simultaneously. Answer option B is incorrect. Double Wide SCSI-2 uses 32-bit bus. Answer

  options C and E are incorrect. Fast SCSI-2 and Ultra-2 SCSI (Fast-40) used 8-bit bus.

  Reference: "http://en.wikipedia.org/wiki/SCSI"

• Question 12:

  Which of the following slots on a motherboard are best for a video card?

  Each correct answer represents a complete solution. Choose two.

  A. PCIe

  B. PCI

  C. AGP

  D. EISA

  Correct Answer: AC

  AGP and PCIe are the best slots for a video card. PCI Express (PCIe), also known as 3rd Generation I/O (3GIO), is a type of computer bus. It is a new I/O bus technology that has more bandwidth than PCI and AGP slots. It uses two low-

  voltage differential pairs, at 2.5Gb/s in each direction. It is designed to replace PCI and AGP expansion slots.

  The bus is available in several different bus widths: x1, x2, x4, x8, x12, x16, and x32. PCIe is able to transfer data in both directions at a time. PCIe hardware will work on operating systems that support PCI.

  AGP is a high speed 32-bit bus designed for high performance graphics and video support. It allows a video card to have direct access to a computer's RAM, which enables fast video performance. AGP provides a bandwidth of up to 2,133

  MB/second. Answer option D is incorrect. The Extended Industry Standard Architecture (EISA) is a 32- bit PC expansion bus designed as a superset of a 16-bit ISA bus. The EISA bus is designed to increase the speed and expand the data

  width of the legacy expansion bus while still supporting older ISA cards.

  EISA slots are obsolete now.

  Answer option B is incorrect. PCIe and AGP slots are better than PCI slot for a video card. Reference: "http://en.wikipedia.org/wiki/PCI_Express",

  "http://en.wikipedia.org/wiki/Accelerated_Graphics_Port"

• Question 13:

  Which of the following types of SATA hard disk drives is used for the Desktop computers?

  A. 3.5 inches

  B. 6.2 inches

  C. 1.8 inches

  D. 2.5 inches

  Correct Answer: A

  The 3.5 inches SATA hard disk is used for the Desktop computers. The Serial ATA (SATA) computer bus is a storage-interface for connecting host bus adapters to mass storage devices such as hard disk drives and optical drives. SATA

  offers several compelling advantages over the older parallel ATA (PATA) interface, such as reduced cable-bulk and cost, faster and more efficient data transfer, full duplex, and hot swapping. It is designed to replace the older ATA (AT

  Attachment) standard (Parallel ATA). All SATA devices support hot plugging and hot swapping. SATA supports Native Command Queuing (NCQ) for enhanced performance.

  Answer options C and D are incorrect. The 1.8 inches and 2.5 inches hard disk drives are used in laptops.

  Answer option B is incorrect. There is no such size of SATA hard disk drive as 6.2 inches. Reference: "http://en.wikipedia.org/wiki/Serial_ATA"

• Question 14:

  You are trying to select a particular wireless encryption algorithm. You are concerned that it implements as much of the wireless 802.11i standard as possible.

  Which encryption algorithm should you implement?

  A. WEP2

  B. WPA2

  C. WPA

  D. WEP

  Correct Answer: B

  WPA2 is, to date, the most 802.11i compliant encryption protocol available. Answer option C is incorrect. WPA2 is an improvement over WPA, but unlike WPA2 it does not implement certain key elements of 802.11i such as Counter Mode

  with Cipher Block Chaining Message Authentication Code.

  Answer option D is incorrect. WEP does not implement many aspects of the 802.11i standards.

  What is WEP?

  Wired Equivalent Privacy (WEP) is a security protocol for wireless local area networks (WLANs). It has two components, authentication and encryption. It provides security, which is equivalent to wired networks, for wireless networks. WEP

  encrypts data on a wireless network by using a fixed secret key. WEP incorporates a checksum in each frame to provide protection against the attacks that attempt to reveal the key stream. Answer option A is incorrect. WEP2 does not

  actually exist. It is not an encryption algorithm.

  Reference: http://en.wikipedia.org/wiki/Wi-Fi_Protected_Access

• Question 15:

  Which of the following are used by FireWire 800 devices?

  A. 6-pin connectors

  B. 10-pin connectors

  C. 9-pin connectors

  D. 4-pin connectors

  Correct Answer: C

  FireWire 800 devices use 9-pin connectors at both ends of the cable. FireWire 400 devices can also be connected to the FireWire 800 ports and vice versa by using an appropriate adapter cable.

  What are FireWire ports? Hide

  FireWire ports are found on high-end computers and many new media centers. They are also called IEEE 1394 ports.

  FireWire ports transfer data at a rate of 400 Mbps or 800 Mbps. They are used primarily for video transfer from digital movie cameras.

  Answer options D and A are incorrect. FireWire 400 devices use 4-pin or 6-pin connectors. Reference: "http://en.wikipedia.org/wiki/FireWire "

• Question 16:

  Which of the following types of batteries are considered as environmental hazards?

  Each correct answer represents a complete solution. Choose three.

  A. Button cell

  B. Lead-acid

  C. NiMH

  D. NiCd

  Correct Answer: ABD

  The following types of batteries are considered as environmental hazards:

  Nickel cadmium (NiCd)

  Lead-acid

  Button cell

  Nickel cadmium (NiCd) batteries contain nickel and cadmium. Cadmium is highly toxic. Lead-acid batteries contain lead that is considered as environmental hazard. Button cell batteries contain mercury that is considered as environmental

  hazard. Answer option C is incorrect. Nickel metal hydride (NiMH) batteries are not considered as environmental hazards.

  Reference: "http://en.wikipedia.org/wiki/Battery_(electricity)"

• Question 17:

  Which of the following will you use to clean your laptop screen?

  Each correct answer represents a complete solution. Choose two.

  A. Detergent

  B. Slightly wet and soft cloth

  C. Rough cloth

  D. LCD screen cleaner

  Correct Answer: BD

  In order to clean your laptop screen, you will have to use a slightly wet and soft cloth and a cleaner that is specially designed for LCD screens. LCD screen cleaner can be purchased from computer shops.

  Answer option A is incorrect. Detergent should not be used to clean LCD screens. Detergent contains chemicals that are harmful for LCD screens. Answer option C is incorrect. Rough cloth should not be used to clean LCD screens. It will

  scratch the coating on an LCD screen.

  Reference: "http://www.computerhope.com/cleaning.htm#91"

• Question 18:

  Which of the following statements about Hardware Compatibility List (HCL) are true?

  Each correct answer represents a part of the solution. Choose two.

  A. It ensures that a computer and its components are compatible with the operating system before the operating system is installed.

  B. It contains the listing of all the hardware that operating systems vendors have tested with their operating systems.

  C. It ensures that a computer and its components are working properly.

  D. It contains the license to use operating systems.

  Correct Answer: AB

  The Hardware Compatibility List (HCL) contains the listing of all the hardware that operating systems vendors have tested with their operating systems. Through HCL, an administrator can be sure that a computer and its components are compatible with the operating system before the operating system is installed. HCL helps administrators to verify that the CPU, RAM, storage devices, various interface cards, and other hardware components are supported by the operating systems. Reference: "http://www.microsoft.com/whdc/hcl/default.mspx"

• Question 19:

  Which of the following statements about Standby Power Supply (SPS) is true?

  Each correct answer represents a complete solution. Choose two.

  A. It provides protection against power surges.

  B. It provides protection against power drops and power surges.

  C. It provides no protection against power surges.

  D. It provides protection against under voltage.

  Correct Answer: CD

  An SPS device provides protection against under voltage. When a power drop occurs, it engages battery power and takes over from power outlets. SPS does not provide protection against power surges.

  Answer option B is incorrect. It is the Uninterruptible Power Supply (UPS) that protects devices against power drops and power surges.

  Answer option A is incorrect. Surge protectors protect devices against power surges.

• Question 20:

  You are responsible for tech support at your company. You have been instructed to make certain that all desktops support file and folder encryption. Which file system should you use when installing

  Windows XP?

  A. FAT

  B. EXT4

  C. FAT32

  D. NTFS

  Correct Answer: D

  NTFS is the file system first introduced with Windows 2000 and it inherently supports file encryption as well as other exciting features such as file compression.

  What is NTFS?

  NTFS is an advanced file system designed for use specifically in Windows NT, Windows 2000/2003, and Windows XP operating systems. It supports file system recovery, large storage media, long file names, and other features. NTFS offers

  features such as disk quotas, distributed link tracking, compression, and mounted drives.

  NTFS also offers security features, such as encryption and file and folder permissions.

  These features are not available on FAT volumes.

  Answer options A and C are both incorrect. FAT is an old file system used with DOS and Windows

  3.1. FAT32 was simply a 32 bit version of FAT and was used with Windows 95 and Windows 98.

  Neither FAT nor FAT32 support file or folder encryption. Answer option B is incorrect. EXT is a file system used with Linux and does not work with any version of Windows.

  Reference:

  http://www.microsoft.com/windows/windows2000/en/advanced/help/encrypt_overview.htm