CompTIA® A+ Hardware Exam Cram Notes : Usb, Ide, And Nic

A+ Core hardware Technologies-Exam cram

A+ Certification, awarded by CompTIA® organization is the most widely recognized certification in the area of PC hardware and software technologies. To attain A+ certification, one need to pass 2 exams, namely, A+ Core Hardware Technologies, and A+ Operating Systems Technologies. These exams basically test the skills in assembling a computer, troubleshooting, and the ability to work with various operating systems. Linux is not included in the A+ Certification Operating Systems exam, as it has an exam of its own (Linux+ Certification), offered by CompTIA. The exam cram offers several final preparation points for candidates intending to appear for the A+ test. Latest objectives are available from website.

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51. Token Ring supports 4 Mbps and 16 Mbps speeds.

52. NIC, Network Interface Card is the one that interfaces your PC to the LAN. NIC sits in your PC on one of the slot available on the motherboard.

53. Ultra IDE cable has 80 wires, and handles better speeds compared to IDE cable with 40 wires. The additional wires are introduced to reduce noise and thereby improving speed.

54. When signals are transmitted over long distance, there will be ohmic losses, which result in loosing the strength of the signals. This is known as attenuation. Amplification is opposite of attenuation.

55. Asynchronous serial communication uses Start bit/Data bits/Stop bit. A modem connecting to the Internet is a typical asynchronous device. Synchronous communication uses clock signals to transfer information. Does not use start/stop bits. Synchronous communication is normally used for high speed data transfers.

56. USB:

USB supports up to 127 devices simultaneously.

USB enables you to daisy chain up to 127 USB devices. A USB hub is used for this purpose. Also, USB devices can be plugged in without turning on/off power. I.e. USB devices are hot swappable.

57. A floppy cable will have 34 wires, and the wire with red stripe signifies wire going to pin number 1 of the connector.

58. The Slot 1 package replaces the Socket 7 and Socket 8 used by previous Pentium processors. Slot 1 is a 242-contact daughtercard slot that accepts a microprocessor packaged as a Single Edge Contact (SEC) cartridge. A motherboard can have one or two Slot 1s. More recently, Slot 2 package has been developed and used by recent processors.

59. The following are major characteristics of a floppy drive:

  • The ribbon cable connecting the floppy drive to the mother board, is 34 wires wide.
  • There can be a maximum of two floppy drives in a PC
  • The floppy ribbon cable is distinguished easily from that of an IDE cable by a small twist in the cable. The purpose of the twist is to differentiate between floppy drive A and floppy drive B.

60. TCP/IP is the medium of transport when your are accessing the Internet.

61. ISDN:ISDN BRI (Basic Rate Interface) will have two B channels, each can carry data up to 64Kbps, aggregating to 128 Kbps.

62. ATX power supply provides three different voltages:

3.3Volts, 5Volts, and 12Volts.

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