Learn the Basic Networking and Topology

Computer Communications - A process in which two or more computers or devices transfer’s data, instructions, and information. For successful communications you need the following:

• A sending device - Initiates an instruction to transmit data, instructions, information
• A communications device - Connects the sending device to a communications channel
• A communication channel - Transmission media on which the data, instructions, or information 
• A communications device - Connects the sending device to a communications channel
• A receiving device - Accepts the transmission of data, instruction of information

Uses of computer communication

• Internet - A worldwide collection of networks that links millions of businesses, government agencies, educations, and individual
• Web - Worldwide collection of electronic documents on the internet that users access through Web browser.
• E-Mail - Or Electronic mail, is type of mail message that is sent through the network. 
• Instant messaging - A Real-time internet communication service that notifies you when one or more people are online,then allows you to exchange messages, pictures, files, audio and video.
• Chat rooms - A Real-time typed in conversation that takes place on a computer connected to a network, that also allows you to exchange messages, pictures, files, audio and video.
• Newsgroup - Online areas in which user’s have written discussion about a particular subject.
• Internet telephony - A conversation takes place over the internet using a telephone connected to a desktop computer.
• FTP - Internet standard that permits or allows user to upload or download files.
• Web Folder - Known as HTTP server, allows users publish documents and other files.
• Video conferencing - Realtime meeting over two person, use the internet to transmit audio and video signal.
• Fax Machine or Computer fax/modem - Transmits and receives documents over the phone line.

Network Communications Standard

Data is processed in one of two ways: Analog or Digital. A computer, by contrast, is Digital Which means it can process data in two discrete states: Positive (ON or 1) Non-Positive (OFF or 0). The 1 and 0 represent the two digits used by the binary number system, this system is at the heart of digital computing.

Computer Network - A collection of computers and devices connected together via communications devices and transmission media.

Learn About Storage Devices

Storage device - is a hardware device designed to write and read information. There are two types of storage devices used in computers; a 'primary storage' device and a 'secondary storage' device.

Storage Media - It is where the storage device records (write) and retrieves (read) the data, instructions and information for future use.

Examples of Storage and Media Devices

Harddisk Devices and USB Thumb Drive

Optical Device

3.5 Floppy Device

Learn About Central Processing Unit

Learning about central processing unit is also part of the TESDA NC II Computer Servicing exam. So it is advisable to learn about these things.

Processors

Central Processing Unit - Is a complete computation engine that is fabricated on a single chip. Interprets and carries out the basic instructions that operate a computer. Processors contain a control unit and an arithmetic logic unit (ALU), this two components work together to perform processing operations.

Dual-Processor

Dual-processor (DP) - systems are those that contain two separate physical computer processors in the same chassis. In dual-processor systems, the two processors can either be located on the same motherboard or on separate boards.

Dual Core Configuration

Dual-core configuration - an integrated circuit (IC) contains two complete computer processors. Usually, the two identical processors are manufactured so they reside side-by-side on the same die, each with its own path to the system front-side bus.

Dual core Processor features: 

• Hyper-Threading Technology: Enables you to run multiple demanding applications at the same time.
• Intel Extended Memory 64 Technology: Provides flexibility for future applications that support both 32-bit and 64-bit computing.
• Dual-Core: Two physical cores in one processor support better system responsiveness and multi-tasking capability than a comparable single core processor.

Processor core (An intel Core 2 Duo Chip) It has 291,000,000 transistor.