Saturday, July 27, 2013 - Articles on OSI Model, Motherboard, and others. has the following articles which may be useful in understanding or preparing for A+ cert.

Motherboard components:
1. Mouse & keyboard
2. USB
3. Parallel port
4. CPU Chip
5. RAM slots
6. Floppy controller
7. IDE controller
8. PCI slot
9. ISA slot
10. CMOS Battery
11. AGP slot
12. CPU slot
13. Power supply plug in 
Network implementation consists of the following steps:
1. Physical network design
i. Local Area Network design:
LAN design consists of selecting appropriate devices such as Hubs, Bridges, Switches, and Routers. Criteria for selecting LAN devices include the following:
  1. The number of ports required at different levels
  2. The speed (10Mbps/100Mbps/1Gbps or others)
  3. Media considerations, such as Ethernet, Token Ring etc.
  4. Support for different network protocols such as TCP, VOIP etc.
  5. Ease of configuration, and maintainability
  6. Management (SNMP etc.)
  7. Availability
  8. Documentation
Printers are commonly used output devices that produce a hard copy of document stored in electronic form, i.e they put information from computer on to paper.
 There are various kinds of printers available today like Impact printers, Bubble-jet printers, Laser printers, Thermal printers etc.
An Internet consists of a set of connected networks. The chief advantage of an Internet is that it provides universal interconnection while allowing individual groups to use whatever network hardware is best suited to their needs. The technology TCP/IP provides the basis for the global Internet, which helps in connecting individuals, universities, corporation and government department in many countries around the globe. The global Internet is expanding rapidly.
 The OSI (Open Systems Interconnection) Model has the following layers:
  1. The Application layer
  2. The Presentation layer
  3. The Session layer
  4. The Transport layer
  5. The Network layer
  6. The Data link layer
  7. The Physical layer

Note that the layers are divided for convenience and understanding, and in actual practice, there might be some overlap in functionalities. Visit for free articles.

Thursday, July 25, 2013

A+ Certification 220-801 Practice Tests released A+ 220-801 Essentials practice tests with 300+ questions and answers. As you might be aware, CompTIA has release new exams several months ago and the older 220-701 will become obsolete very shortly. If any one is preparing for the exam with older objectives, you need to take the exam before it expires.

You may download the new A+ Essentials practice tests and try before purchasing the full version.