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What is 802.11g?

October 28th, 2009

The 802.11g standard, defined by IEEE, is an extension to the 802.11b standard of wireless network. It operates in 2.4-GHz band and brings data rates up to 54Mbps using Orthogonal Frequency-Division Multiplexing (OFDM) technology. Since the 802.11g standard is backward compatible with 802.11b, an 802.11b device can interface directly with an 802.11g access point.

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Posted in A+, A+ 2009, A+2006, CCENT, CCNA, CCNA Wireless, MCITP, MCITP Consumer Support Technician, MCITP Enterprise Administrator, MCITP Enterprise Support Technician, MCITP Microsoft Windows Client, MCITP Microsoft Windows Server, MCP, MCSA, MCSA 2000, MCSE, MCSE 2000, MCSE 2000 Security, MCSE 2003 Messaging, MCSE 2003 Security, MCSE-NT to 2003, MCTS, MCTS Windows Technology, MCTS Windows Vista, Network+

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What is SO-DIMM?

October 26th, 2009

Small Outline Dual Inline Memory Module (SO-DIMM) is a type of memory module that comes in 72 pins and 144 pins. The 72-pin SO-DIMM supports 32-bit transfers, and the 144-pin SO-DIMM supports 64-bit transfers. It was introduced for laptops. SO-DIMMs come in smaller packages, consume lesser power, but are more expensive than DIMMs.

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Posted in A+, A+ 2009, A+2006, MCSA, MCSA 2000, MCSE

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What is the FAT32 file system?

September 10th, 2009

The FAT32 file system is an enhancement of the FAT file system. It is more advanced and reliable than all the earlier versions of the FAT file system. It manages storage space on large hard disks more efficiently than the FAT16 file system. It uses a smaller cluster size than the FAT16 file system on the hard disk, thereby reducing the amount of space on the hard disk when users save small files. The FAT32 file system supports hard disk drives larger than 2GB and up to 2TB.

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Posted in A+, A+2006, MCDST, MCITP Enterprise Support Technician, MCP, MCTS Windows Vista

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What is IEEE 802.11b?

August 28th, 2009

The IEEE 802.11b standard applies to wireless LAN networks that use radio waves as the transmission medium. These networks each have a separate media access control mechanism, known as Carrier Sense Multiple Access with Collision Avoidance (CSMS/CA), that works like the CSMA/CD mechanism used by the Ethernet. The difference is that in this protocol, when a computer sends its signals, the receiving computer performs a cyclical redundancy check and sends an acknowledgement message to the sending computer if no error is detected.

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Posted in A+, A+ 2009, A+2006, MCSA, MCSA 2000, MCSE, Network+

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What is ECP?

August 23rd, 2009

Enhanced Capabilities Port (ECP) is a high-speed parallel port developed by Hewlett-Packard and Microsoft in 1992. It offers improved performance for the parallel port and requires special hardware logic. ECP ports support high throughput communications.

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Posted in A+, A+ 2009, A+2006, Linux+, MCSA, MCSA 2000, MCSE

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Storage Devices and Media

August 22nd, 2009

A storage medium is an important part of a computer. Storage media contains data that are being accessed by users and is used to save data. It also saves files that a computer needs to operate. Storage devices and media come in different technologies, sizes, capacities, etc.

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Posted in A+, A+2006, MCSA, MCSA 2000, MCSE

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What is SD card?

August 21st, 2009

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.

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Posted in A+, A+ 2009, A+2006, MCSA, MCSA 2000, MCSE

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What is PCI Express (PCIe)?

August 21st, 2009

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.

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Posted in A+, A+ 2009, A+2006, MCSA, MCSA 2000, MCSE

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What is Trojan horse?

August 19th, 2009

Trojan horse is a malicious software program code that masquerades itself as a normal program. When a Trojan horse program is run, its hidden code runs to destroy or scramble data on the hard disk. An example of a Trojan horse is a program that masquerades as a computer logon to retrieve user names and password information. The developer of a Trojan horse can use this information later to gain unauthorized access to computers. Trojan horses are normally spread by e-mail attachments. Unlike viruses, Trojan horses do not replicate themselves but only destroy information on hard disks.

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Posted in A+, A+ 2009, A+2006, CIW Associate, CIW Associate Design Specialist, CIW Certified Security Analyst, CIW Professional, MCSA, MCSA 2000, MCSE, Master CIW Administrator, Master CIW Designer, Master CIW Enterprise Developer, Master CIW Web Site Manager

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What is the FAT32 file system?

July 17th, 2009

The FAT32 file system is an enhancement of the FAT file system. It is more advanced and reliable than all the earlier versions of the FAT file system. It manages storage space on large hard disks more efficiently than the FAT16 file system. It uses a smaller cluster size than the FAT16 file system on the hard disk, thereby reducing the amount of space on the hard disk when users save small files. The FAT32 file system supports hard disk drives larger than 2GB and up to 2TB.

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Posted in A+, A+2006, MCDST, MCITP Enterprise Support Technician, MCP, MCTS Windows Vista

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