CompTIA CompTIA Certifications FC0-U51 Questions & Answers

• Question 21:

  Which of the following statements about High-Definition Multimedia Interface (HDMI) are true?

  Each correct answer represents a complete solution. Choose two.

  A. It is capable of delivering the highest quality digital video and multi-channel digital audio on a single cable.

  B. It is an interface primarily used to connect hard disk and CD drives in a computer.

  C. It is a new I/O bus technology that has more bandwidth than PCI and AGP slots.

  D. It has two types of connectors: Type A and Type B.

  Correct Answer: AD

  HDMI stands for High-Definition Multimedia Interface. It is a standard, uncompressed, and all-digital audio/video interface. HDMI is capable of delivering the highest quality digital video and multichannel digital audio on a single cable. It provides an interface between any audio/video sources, such as a DVD player or a computer and a digital television (DTV) or video monitor. HDMI transmits all ATSC HDTV standards and supports 8-channel digital audio, with extra bandwidth to accommodate future enhancements. HDMI has two types of connectors: Type A and Type B. Type A and Type B connectors use 19 pins and 29 pins, respectively. The Type B connector is designed for very high-resolution displays that are expected in near future. Answer option B is incorrect. Integrated Digital Electronics (IDE) is an interface primarily used to connect hard disk and CD drives in a computer. Answer option C is incorrect. 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. Reference: "http://en.wikipedia.org/wiki/HDMI"

• Question 22:

  Which of the following technologies is used to detect unauthorized attempts to access and manipulate computer systems locally or through the Internet or an intranet?

  A. Demilitarized zone (DMZ)

  B. Firewall

  C. Intrusion detection system (IDS)

  D. Packet filtering

  Correct Answer: C

  An Intrusion detection system (IDS) is used to detect unauthorized attempts to access and manipulate computer systems locally or through the Internet or an intranet. It can detect several types of attacks and malicious behaviors that can compromise the security of a network and computers. This includes network attacks against vulnerable services, unauthorized logins and access to sensitive data, and malware (e.g. viruses, worms, etc.). An IDS also detects attacks that originate from within a system. In most cases, an IDS has three main components: Sensors, Console, and Engine. Sensors generate security events. A console is used to alert and control sensors and to monitor events. An engine is used to record events and to generate security alerts based on received security events. In many IDS implementations, these three components are combined into a single device. Basically, following two types of IDS are used : Network-based IDS Host-based IDS Answer option D is incorrect. Packet filtering is a method that allows or restricts the flow of specific types of packets to provide security. It analyzes the incoming and outgoing packets and lets them pass or stops them at a network interface based on the source and destination addresses, ports, or protocols. Packet filtering provides a way to define precisely which type of IP traffic is allowed to cross the firewall of an intranet. IP packet filtering is important when users from private intranets connect to public networks, such as the Internet. Answer option B is incorrect. A firewall is a tool to provide security to a network. It is used to protect an internal network or intranet against unauthorized access from the Internet or other outside networks. It restricts inbound and outbound access and can analyze all traffic between an internal network and the Internet. Users can configure a firewall to pass or block packets from specific IP addresses and ports. Answer option A is incorrect. Demilitarized zone (DMZ) or perimeter network is a small network that lies in between the Internet and a private network. It is the boundary between the Internet and an internal network, usually a combination of firewalls and bastion hosts that are gateways between inside networks and outside networks. DMZ provides a large enterprise network or corporate network the ability to use the Internet while still maintaining its security. Reference: "http://en.wikipedia.org/wiki/Intrusion-detection_system"

• Question 23:

  What is the maximum resolution that SXGA video technology supports?

  A. 2560 x 1600

  B. 1024 x 768

  C. 1280 x 1024

  D. 1280 x 720

  Correct Answer: C

  SXGA stands for Super eXtended Graphics Array. It is a display standard that refers to video adapters. This standard is an enhancement of the standard XGA resolution developed by IBM. It is capable of displaying the resolution of 1280 x 1024 pixels. 1280 refers to horizontal pixels, and 1024 refers to vertical pixels. Answer option D is incorrect. The WXGA video technology supports a maximum resolution of 1280 x

  720.

  Answer option A is incorrect. The WQXGA video technology supports a maximum resolution of 2560 x 1600.

  Answer option B is incorrect. The XGA video technology supports a maximum resolution of 1024 x

  768.

  Reference: "http://www.computerhope.com/jargon/s/sxga.htm"

• Question 24:

  Under which environmental conditions is the risk of Electrostatic discharge (ESD) the highest?

  A. Low temperature

  B. High humidity

  C. Low humidity

  D. High temperature

  Correct Answer: C

  Low humidity increases the risk of Electrostatic discharge (ESD). Dry air is a poor conductor of electricity and it increases the risk of ESD. Humidity reduces the risk ESD because water molecules carry static electric charge away. Clothing,

  footwear, and flooring material are important considerations in evaluating the potential for ESD.

  To reduce the risk of ESD, you should take the following precautions while installing new hardware:

  Work on a tile floor instead of carpeting.

  Remove your shoes, if possible, and roll up your shirt's sleeves. If you set the component down, do not let the component touch the table before your hand touches the table.

  What is ESD?

  ESD stands for Electrostatic discharge. The static electricity that we generate everyday creates ESD. If you walk across a carpet and touch someone, you experience a mild shock. Electrostatic discharge occurs when the electrostatic charge

  is transferred from one charged entity to another entity sensitive to that charge. components. A wrist strap is a wire with a watchband-style strap at one end and a plug or clip on the other end. The wrist strap plug or clip is connected to the

  ground or to the piece of equipment being worked on.

• Question 25:

  Mark has a file named DAT A. TXT on the C. drive on his computer. He wants to set the hidden attribute on the file.

  Which of the following commands will he use to accomplish this task?

  A. ATTRIB +h DATA.TXT

  B. ATTRIB -h DATA.TXT

  C. ATTRIB -A DATA.TXT

  D. ATTRIB /hidden DATA.TXT

  Correct Answer: A

  In order to set the hidden attribute on the file, Mark will have to run the following command on the command prompt:

  ATTRIB +h DATA.TXT

  Where:

  + is used for setting attribute.

  h is used for hidden attribute.

  DATA.TXT is the file name.

  Answer option B is incorrect. This is used to clear the hidden attribute from a file. Answer option D is incorrect. The /hidden is not a valid switch for the ATTRIB command. Answer option C is incorrect. The ATTRIB -A DATA.TXT command will

  be used to clear the archive attribute from a file.

  Reference: "http://www.computerhope.com/attribhl.htm"

• Question 26:

  Which of the following are removable storage devices/media?

  Each correct answer represents a complete solution. Choose three.

  A. CD-ROM

  B. SD card

  C. Hard disk drive

  D. USB Pen drive

  Correct Answer: ABD

  CD-ROM, SD card, USB Pen drive, floppy disk, etc., are removable storage media. CD-ROM (Compact Disc Read-Only Memory) is a type of removable storage optical media. It can store up to 1GB of data, although most common CD-ROMs store 700MB of data. It comes in a standard size and format, so users can load any type of CD-ROM into any CD drive or CD-ROM player. Once data is written to a CD-ROM, it cannot be erased or changed. SD card is a removable storage device. Secure Digital (SD) card is a non-volatile memory card format used in portable devices such as mobile phones, digital cameras, and handheld computers. SD cards are based on the older MultiMediaCard (MMC) format, but they are a little thicker than MMC cards. Generally an SD card offers a write-protect switch on its side. SD cards generally measure 32 mm x 24 mm x 2.1 mm, but they can be as thin as 1.4 mm. The devices that have SD card slots can use the thinner MMC cards, but the standard SD cards will not fit into the thinner MMC slots. Some SD cards are also available with a USB connector. SD card readers allow SD cards to be accessed via many connectivity ports such as USB, FireWire, and the common parallel port. USB Pen drive is a removable storage device. A pen drive is also known as a USB flash drive. It is a small device used to transfer data from one computer to another through USB ports. Pen drives are available in various capacities. When a pen drive is plugged into the USB port, Windows Explorer shows it as a removable drive. Answer option C is incorrect. The hard disk drive is not a removable storage media. It is installed inside the computer case. It can store large amounts of data and provides fast read/write performance. HDD can be connected to a computer with the Integrated Device Electronics (IDE), Small Computer System Interface (SCSI), and SATA interface. It consists of inflexible platters coated with material in which data is recorded magnetically with read/write heads. Note: Only external hard disk drives are removable devices.

• Question 27:

  Which of the following is a framework for defining reusable software components that perform a particular function or a set of functions in Microsoft Windows?

  A. SSID

  B. ActiveX

  C. Cookies

  D. JavaScript

  Correct Answer: B

  ActiveX is a framework for defining reusable software components that perform a particular function or a set of functions in Microsoft Windows. ActiveX controls are software components that can be integrated into Web pages and applications, within a computer or among computers in a network, to reuse the functionality. Reusability of controls reduces development time of applications and improves program interfaces. They enhance the Web pages with formatting features and animation. ActiveX controls can be used in applications written in different programming languages that recognize Microsoft's Component Object Model (COM). These controls always run in a container. ActiveX controls simplify and automate the authoring tasks, display data, and add functionality to Web pages. Answer option D is incorrect. JavaScript is a simple, light weight, and dynamic World Wide Web (WWW) scripting language developed by Netscape Communications. The syntax of JavaScript resembles that of C++. JavaScript facilitates integration of HTML documents, Web components, and multimedia plug-ins. It also aids in the development of server-side Web applications. Answer option A is incorrect. SSID stands for Service Set Identifier. It is used to identify a wireless network. SSIDs are case sensitive text strings and have a maximum length of 32 characters. All wireless devices on a wireless network must have the same SSID in order to communicate with each other. Answer option C is incorrect. A cookie is a small bit of text that accompanies requests and pages as they move between Web servers and browsers. It contains information that is read by a Web application, whenever a user visits a site. Cookies are stored in the memory or hard disk of client computers. A Web site stores information, such as user preferences and settings in a cookie. This information helps in providing customized services to users. There is absolutely no way a Web server can access any private information about a user or his computer through cookies, unless a user provides the information. A Web server cannot access cookies created by other Web servers. Reference: "http://en.wikipedia.org/ wiki/ActiveX "

• Question 28:

  Which of the following ports support hot swapping?

  Each correct answer represents a complete solution. Choose two.

  A. USB

  B. Parallel

  C. Serial

  D. IEEE 1394

  Correct Answer: AD

  USB and IEEE 1394 ports support hot swapping.

  What is USB?

  Universal Serial Bus (USB) is a high speed bus standard developed by Compaq, IBM, DEC, Intel, Microsoft, NEC, and Northern Telecom. It provides the Plug and Play capability of Windows to external hardware devices. USB supports hot

  plugging, which means that a USB device can be installed or removed while the computer is running. A single USB port can be used to connect up to

  127 peripheral devices, such as CD-ROM drives, tape drives, keyboards, scanners etc. USB 1.1 has a maximum data transfer rate of 12 Mbps, whereas USB 2.0 has a maximum data transfer rate of 480

  Mbps. USB 2.0 is fully backward compatible with USB 1.1.

  What is IEEE 1394?

  Institute of Electrical and Electronics Engineers (IEEE) 1394 is a standard for high-speed serial bus that provides enhanced PC connectivity for a wide range of devices. These devices include consumer audiovisual components, traditional PC

  storage devices, and handheld devices. IEEE 1394 is also known as Firewire. Answer options C and B are incorrect. Serial and parallel ports do not support hot swapping or hot plugging.

• Question 29:

  Your customer is using Windows Vista and complains about the quality of picture he is getting on his monitor. You find that you cannot adjust the refresh rate or the resolution.

  What is the most likely cause?

  A. The video card is not recognized by Windows.

  B. The monitor is not compatible with the video card.

  C. The video card has failed.

  D. The video card does not have enough video RAM.

  Correct Answer: A

  When Windows does not recognize the video card, it gives a set of simplified default settings for refresh rate, resolution, etc.

  Answer option B is incorrect. As long as the monitor can plug into the card, it is compatible. Answer option C is incorrect. If the video card had failed, there would have been no picture at all on the monitor screen.

  Answer option D is incorrect. Lack of sufficient video RAM would just prevent certain graphics from being displayed.

  Reference: http://www.technibble.com/troubleshooting-video-cards-problems-and- solutions/

• Question 30:

  Which of the following are touch screen technologies?

  Each correct answer represents a complete solution. Choose all that apply.

  A. Surface Wave

  B. Resistive

  C. Transitive

  D. Capacitive

  Correct Answer: ABD

  Touch screen is a computer display screen that is sensitive to human touch. It allows a user to interact with a computer by touching the icons or graphical buttons on the monitor screen. It is a system that is designed to help users who have difficulty in using mouse or keyboard and is used with information kiosks, computer-based training devices etc. A touch screen panel is attached externally to the monitor that is connected to a serial or Universal Serial Bus (USB) port on a computer. Nowadays, monitors are also available with built-in touch screen technology. There are three types of touch screen technologies: 1.Resistive 2.Capacitive 3.Surface Wave Answer option C is incorrect. There is no such touch screen technology as Transitive. Reference: "http://en.wikipedia.org/wiki/Touchscreen"