By Pawan K. Bhardwaj
ISBN-10: 0596551517
ISBN-13: 9780596551513
If you are getting ready for the recent CompTIA 2006 certification in A+, or the present community+ and defense+ certifications, you will discover this publication priceless. It offers the entire details you must prepare for those assessments, together with the 4 new A+ checks -- the mandatory necessities examination and 3 optional tests that pertain on your quarter of specialization.
As with different O'Reilly Nutshell books for certification checks, A+, community+ and defense + in a Nutshell follows a confirmed type and technique. It stories all the subject matters had to grasp each one examination in a remarkably concise layout, with required wisdom boiled all the way down to the center. rather than plowing via 500 to seven-hundred pages to organize for every examination, this ebook covers every one in nearly a hundred and fifty pages. and as the pursuits for the 3 non-compulsory A+ checks are redundant, and the booklet covers them in a single section.
The tests lined include:
- A+ necessities: Required for A+ 2006 certification
- EXAM 220-602:...
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Additional resources for A+, Network+, Security+ Exams in a Nutshell. A Desktop Quick Reference
Example text
This part of the study guide covers about one-fifth of the exam objectives. As a hardware technician, you are expected to have extensive knowledge of different components of personal computers. These components include storage devices, motherboards, processors, memory, power supplies, and adapter cards. It is also necessary to have a good understanding of ports and cable types that are used inside the computer and for connecting external peripherals. This section provides an overview of these components.
SouthbridgeThe Southbridge chipset controls all of the computer's onboard Input/Output (I/O) functions such as USB, Firewire, PS/2, parallel, serial, wired, and wireless LAN ports, and IDE, audio, and so on. Southbridge usually consists of a single semiconductor chip. BIOS/Firmware The Basic Input/Output System (BIOS) or firmware of the computer is low-level software stored on a semiconductor chip, which is called the BIOS chip. BIOS controls how the processor and chipsets interact with the installed operating system, and it also helps detect the hardware and to allocate system resources to it.
These modules are hardly used these days. A parity bit is used as error-detecting code. The parity bit is a binary digit (0 or 1) that indicates whether the total number of bits with a value of 1 in a given set is even or odd. Two types of parity bits are used: even parity bit and odd parity bit. The even parity bit is set to 0 when the total count of 1s in the given set is even. If the total count of 1s is odd, the bit is set to 1. On the other hand, the odd parity bit is set to 0 when the total count of 1s in the given set is odd.