2. Introduction To Networking
What is Network ?
• when you have two or more computers connected to each
other you have a network.
• The purpose of a network is to enable the sharing of files and
information between multiple systems.
• The internet could be described as a global network of
networks.
• Computer network can be connected through cables , such as
Ethernet cables or phone lines or wirelessly, using wireless
networking cards that send and receive data through the air.
3. Uses Of Computer Network
A computer network extends interpersonal
communications by electronic mean with various
technologies, such as email, instant messaging, online
chat, voice and video telephone calls, and video
conferencing . A network allows sharing of network and
computing resources. User may access and use resources
provided by devices on the network such as printing a
document on a shared network printer or use of shared
storage device. A network allows sharing of files, data, and
other types of information giving authorized users the
ability to access information stored on other computers
on the network.
4. Types Of Computer Networks
There are 7 types of Computer Networks
1. Personal Area Network (PAN)
2. Local Area Network (LAN)
3. Wireless Local Area Network (WLAN)
4. Metropolitan Area Network (MAN)
5. Wide Area Network (WAN)
6. Storage Area Network (SAN)
7. Virtual Private Network (VPN)
5. Personal Area Network (PAN)
This type of network is designed to enable
devices in small office or home office (SOHO).
Environment to communicated and share
resources data and application either wired or
wirelessly . PANS typically consists of laptops,
smartphones, tablets, wearables, printers and
entertainment devices.
6. Local Area Network (LAN)
A local area network (LAN) consists of a
series of computer linked together to form
a network in a circumscribed location. The
computers in a LAN connected to each
other via TCP/IP ethernet or Wi-Fi A LAN is
normally exclusive to an organization such
as a school, office, association or church.
7. Wireless Local Area Network (WLAN)
A wireless local area network (WLAN) is a
wireless distribution method for two or more
devices. WLANs use high- frequency radio
waves and not often include an access point to
the internet. A WLAN allows user to move
around the coverage area often a home or
small office while maintaining a network
connection.
8. Metropolitan Area Network (MAN)
A metropolitan area network (MAN) IS A
computer network that connects computers
within a metropolitan area, which could be a
single large city multiple cities and towns, or
any given large area with multiple buildings. A
MAN is larger than a local area network (LAN)
but a wide area network (WAN).
9. Wide Area Network (WAN)
A wide area network (also known as WAN)
is a large network of information that is
not tied to a single location. WAN can
facilitate communication, the sharing of
information and much more between
devices from around the world through a
WAN provider.
10. Storage Area Network (SAN)
A storage area network (SAN) is a dedicated,
independent high-speed network that
interconnects and delivers shared pools of
storage devices to multiple servers. Each server
can access shared storage as if it were a drive
directly attached to the server.
11. Virtual Private Network (VPN)
A VPN (virtual private network) is a service that
creates a safe, encrypted online connection.
Internet users may use VPN to give themselves
more privacy and anonymity online or
circumvent geographical based blocking and
censorship.
