3.1.7.1 Describe the types of network communications technology:

3.1.7.1 Describe the types of network communications technology:

Internet

The Internet is the worldwide, publicly accessible system of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP). It consists of millions of smaller business, academic, domestic and government networks, which together carry various information and services, such as electronic mail, online chat, and the interlinked Web pages and other documents of the World Wide Web. Internet is one of the uses of communication. Through the Internet, society has access to global information and instant communication.

Intranet

An Intranet is an internal network that uses Internet technologies and it is a small version of the Internet that exists within an organisation. It is a private computer network that uses Internet protocols, network connectivity and possibly the public telecommunication system to securely share part of an organisation’s information or operation with its employees.
Intranet generally make company information accessible to employees and facilitate working in groups. Simple intranet applications include electronic publishing of organisational materials such as telephone directories, event calendars and job postings.

Extranet

An extranet is a private network that uses Internet protocols, network connectivity, and possibly the public telecommunication system to securely share part of a business’s information or operations with suppliers, vendors, partners, customers or other businesses.
Package shipping companies, for example, allow customers to access their network to print air bills, schedule pickups, and even track shipped packages as the packages travel to their destinations.

3.2.1.1 Identify the devices needed in computer network communication :

• Network Interface Card (NIC)
• Wireless Network Interface Card
• Modem (internal and external)
• Hub / Switch
• Router
• Wireless Access Point

3.2.1.2 State the functions of the following:

• Network Interface Card (NIC)
A Network Interface Card (NIC) is an adapter card or PC card that enables the computer to access the network
• Wireless Network Interface Card
Wireless Network Interface Card (WNIC) is a network card that provides wireless data transmission
• Modem (internal and external)
There are two types of modem, internal modem and external modem. An internal modem only works in stand-alone computers. It is built into the computer. An external modem is separated from the computer and is also mobile.
• Hub / Switch
Hub or switch is a common connection point for devices in a network. Hubs are commonly used to connect segments of a LAN.
• Router
A router is a communications device that connects multiple computers or other routers together and transmits data to the correct destination
• Wireless Access Point
A wireless access point is a central communications device that allow computers to transfer data. This device can help information to be transferred wirelessly to other wireless devices or to a wired network. Wireless access point has high quality antennas for optimal signals.

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