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Conferencing vs Video Conferencing

Intranet vs Extranet

Bluetooth

Protocols

Wireless communication

Wireless Technology

Wi Fi

Wireless Access Point

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A computer on a network can be accessed by many users. Security measures have to be taken to protect networks from unauthorized access and to prevent data or information theft.
2types of network security should maintain in an organization
* Login Security ,provides you a user name a password
*Rights Security provides you some specific rights to access the information (read only, read and edit etc.)

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Let's Do a small practical

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The two types of network architectures are used:

Peer-To-Peer network.(P2P)

Client/Server network.

A network in which all the computers have equal right and are suitable for only small geographical area such as small rooms, building, school, etc. is known as peer to peer network. Some of the disadvantages of peer to peer network are as follows: It has low level security than the client-server network.
In Client Server Network computers are connected to a central device (server) and communication is done through it. The server is the main computer which provides services to the workstation.

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Following are the types of networks based on the geographical area covered or scale of the network.
Personal Area Network (PAN):
A PAN is a computer network organized around a person. It is used for communication between devices such as phones, personal digital assistants, printers and laptops that are in close proximity. We can use these networks to transfer files and photos between the various devices
Local Area Network (LAN):
A LAN is a computer network that is limited to a local area such as a laboratory, a school or an office building. Cables (wires) or low-power radio waves (wireless) are used for the connections in a LAN.LAN is controlled by a single person.
Metropolitan Area Network (MAN):
A MAN is a computer network that usually covers a larger area than a LAN. For example, a network that connects two offices in a city, cable tv network in a city and so on.
Wide Area Network (WAN):
A WAN is a computer network that spans a wide geographical area. A WAN may be spread across cities, countries and continents. A WAN is formed by connecting LANs and MANs. Computers or networks across long distances are usually connected with optical fiber cables, satellite radio links or microwave radio links.
Internet and Intranet in MNCs, Multinational banks are some examples of WAN.

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ETHERNET CARD/NETWORK CARD/NIC

Ethernet card, also known as network interface card (NIC), is a hardware component used by computers to connect to Ethernet LAN and communicate with other devices on the LAN. The earliest Ethernet cards were external to the system and needed to be installed manually. In modern computer systems, it is an internal hardware component means it comes with motherboard now a days.
NETWORKING CABLE
The twisted-pair cable is also known as Ethernet cable OR Networking cable. Almost all modern LAN computer networks use this cable.

This cable consists of color-coded pairs of insulated copper wires. Every two wires are twisted around each other to form pair. Usually, there are four pairs. Each pair has one solid color and one stripped color wire. Solid colors are blue, brown, green, and orange. In stripped color, the solid color is mixed with the white color. All wires are arranged in special order and RJ-45 connector is crimped at both side of cable.
HUB
A hub is a device that is used to connect computers in a network In a hub, when one computer sends data on the network, the hub simply forwards the packets to all the other computers connected to it . Each computer is responsible for determining which packets are destined for it and which are to be ignored.
SWITCH
A switch is a device that is also used to connect computers in a network .However, a switch is a more intelligent device than a hub. Unlike a hub, the switch sends the incoming data to the desired destination only. It records the addresses of all the computers connected to it. So, when a packet is received, the switch reads the information about the destination address to determine if the destination device is connected to it or not. If the destination device is connected, the switch forwards the packet only to that destination device. In this way, the other computers do not have to read and deal with data that is not meant for them.
ROUTER
It used in mostly wireless networking. It connects two or more networks or subnetworks. It allows multiple devices to use the same Internet connection and manages data traffic .

MODEM

Modem is a device that enables a computer to send or receive data over telephone . The data stored on the computer is digital whereas a telephone line or cable wire can transmit only analog data. The main function of the modem is to convert digital signal into analog and vice versa. Modem is a combination of two devices − modulator and demodulator. The modulator converts digital data into analog data when the data is being sent by the computer. The demodulator converts analog data signals into digital data when it is being received by the computer.

Wi-Fi CARD / WIRELESS NETWORK CARD
Wi-Fi card is a card used to connect any device to the local network wirelessly. Most of the laptops come with inbuilt wireless network card.

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# Efficient use of storage media(Hard disk)
# Preserving Information
# Reduction in hardware cost
#  Efficiency
#  Redundancy
#  Quickest Document Delivery

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The network is two or more connected computer which can share resource like a printer, an internet connection, application, etc. It is a collection of computer systems and devices which are linked together using a wireless network or via communication devices and transmission media. The network provides connectivity between computers and devices within a restricted range where only one entity is controlled or authorized to manage the entire system.
Each computer in Network is called NODE.
ON THE OTHER HAND
The internet is a collection of interconnected devices which are spread across the globe. It is a network of networks that consist of public, private, public, sales, finance, academic, business and government networks. The internet is a type of network and called network of networks.

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# NETWORKING AND ITS ADVANTAGES
# TYPES OF NETWORKS
#ACCESSING A FILE FROM A SHARED DRIVE
#NETWORKING COMPONENTS
# NETWORK ARCHITECTURE
#NETWORK SECURITY