DATA COMMUNICATION NETWORK TECHNOLOGY AND TRANSMISSION MEDIA PART 2
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NETWORK
Network by
Jogiyanto is a network of data communication systems involving one or more
computer systems connected to the transmission lines of communication devices
forming a system. Network by Jogiyanto is a network of data communication
systems involving one or more computer systems connected to the transmission
lines of communication devices forming a system. Through network, computer can
access data from other computer, can send data although different location.
Through the network can facilitate the flow of information flow from one area
to another, in other words can integrate information systems within a company
that is divided into several locations. Network can be off-line communication
system, remote job entry system, realtime system, time sharing system or DPP
system.
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Network Components
Components of
a network are nodes and links, nodes are the points that can receive input data
into the network or produce output information or even both. The node can be
either a micro-computer, a gigantic mainframe computer (central node / central
computer), modem, printer multiplexer or other printing device. While the link
is a channel or transmission line or carrier to carry the flow of information
or data between the nodes. Link can be cable, microwave system, laser system or
satelite system. Networks, each located in a remote location from one another,
use a link in the form of a remote transmission line called a microwave system,
a laser system or a WAN (Wide Area Network) satelite system. While the network
with a separate node in a distance that is not too far using the transmission
line by using only cable.
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Network and Internet Connection
Internet network is basically a
data communication network built from individual computer or collection of
small-scale integrated computer network (interconnection).
a. LAN (Local Area Network)
Local Area
Network or LAN, is a Computer Network Type covering the local area. By using a
variety of network devices are quite simple and popular, such as using UTP
cable (Unshielded Twisted-Pair), Hub, Switch, Router, and so on. Examples of
LAN networks such as computers connected at school, at the company, , or
between neighboring houses that still cover the LAN area.
Advantages of
using LAN Types Computers such as more economical in operating expenses, more
efficient in cable use, data transfers between nodes and faster computers
because they cover a narrow or local area, and do not require telecom operators
to create a LAN network.
The
disadvantage of using LAN Types of Networks is that the coverage of the network
area is narrower so as to communicate outside the network becomes more
difficult and the area of data transfer coverage is not as extensive.
b. MAN (Metropolitan Area Network)
Metropolitan
Area Network or MAN, is a wider and more sophisticated Computer Network Type of
LAN Computer Network Type. Called Metropolitan Area Network because this type
of Computer Network MAN is commonly used to connect computer networks from one
city to another. To be able to make a network MAN, usually required by
telecommunication operator to connect between computer network. Examples such
as MoNE networks between cities or regions and also the network of modern malls
that are interconnected between cities. Advantages of this type of Computer
Network MAN is the wider network coverage area so as to communicate more
efficiently, easier in terms of doing business, and also the security in the
network for the better.Losses from MAN Types of Computer Networks such as more
use of operational costs, can be the target of operations by Crackers to take
personal advantage, and to improve the MAN network takes considerable time.
c. WAN (Wide Area Network)
Wide Area
Network or WAN, is a wider and more sophisticated Computer Network Type than
LAN and MAN Computer Network Types. WAN network technology is used to connect a
network with other countries or from one continent to another continent. WAN
networks can consist of different types of LAN and WAN Computer Networks
because of the wide coverage area of the WAN Computer Network Type. WAN
networks, usually using fiber optic cables and embed them in the ground as well
as through the underwater lane.
Advantages of
WAN Computer Network Types such as network coverage area is wider than LAN and
MAN Computer Network Types, information exchange becomes more confidential and
directed because to communicate from one country to another requires more security,
and also easier to develop and ease in terms of business. The disadvantages of
the WAN Network Type such as the required operational costs become more, very
vulnerable to the danger of theft of important data, the maintenance for the
WAN network becomes more severe.
d. Internet
The Internet is a global computer
network or worldwide. Because the Internet is a network of computers that are
connected worldwide, so communication and data transfer or file becomes easier.
The Internet can be said to blend between the various types of Computer
Networks with Topology and Network Types that are interconnected with each
other.
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The advantages
of this type of Internet Network such as communication and sharing of resources
from one network to another network becomes easier, the spread of science
becomes more rapid, the delivery of information becomes faster and easier, and
become a field to earn income
The disadvantages of this type of
Internet Network are cyber criminals becoming widespread, pornography is
becoming increasingly widespread, illegal goods transactions such as narcotics
become rampant, and can also cause slander for misinformation.
e. Wireless (No Cable)
Wireless is a
type of computer network that uses data transmission media without using a
cable. Media used such as radio waves, infrared, bluetooth, and microwave.
Wireless can be enabled into LAN, MAN, and WAN networks. Wireless is intended
for high mobility needs.
Advantages of
Wireless Network Type such as the convenience to connect to the network without
being limited by cable, more towards users who require high mobility, and do
not require network cable. Disadvantages Types of Wireless networks such as
data transmission to users slower than wired network use require strict
security because people outside the network can break into Wireless networks.
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Network Topology
a. Topology Bus
The network
with this topology is also called linear bus because it is connected only
through one linear cable. The commonly used cable is coaxial cable. At the
beginning and end of the cable used terminator. Example: A network that uses a
10Base2 ethernet network connecting card.
b. Topology Star
The network with this technology
is shaped like a star. The relationships between nodes are split by using a hub
or concentrator. Each node is connected by cable to the hub. Example: A network
that uses 10BaseT ethernet, builds a network using a manageable switch.
c. Topology Ring
In this topology each node is
interconnected with other nodes to form a ring. Example: A network using FDDL.
d. Topology Tree
This tree topology is a
combination of three topologies. Some parties also call the mesh topology.