2. Definition...
A computer network is a set of technologies, includin
g hardware, software and media that can be used to co
nnect several computers together, enabling them to co
mmunicate, exchange information and share resource
s.
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3. Uses of computer networks...
1) Simultaneous access.
2) Shared peripheral devices.
3) Personal communications.
4) Easier data backup.
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4. Common Types of Computer Networks...
1) Local Area Network (LAN)
2) Wide Area Network (WAN)
3) Metropolitan Area Network (MAN)
4) Campus Area Network (CAN)
5) Home Area Network (HAN)
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5. Local Area Network (LAN)
This type of network contains the hardware devices th
at are relatively near each other and are physically co
nnected using cables, infrared links or wireless media.
It exists within a single building or even in adjacent b
uildings
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6. Wide Area Network (WAN)
This type of computer network contains two or more
LANs connected together generally across a wide geo
graphical area.
These remote LANs are connected through a telecom
munication network or internet service provider.
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7. Metropolitan Area Network (MAN)
This type of computer network contains a large scale
network that connects multiple corporate LANs in a
metropolitan city.
MANs usually provide high-speed network commun
ication devices and equipments usually maintained b
y a group or single network provider that sells its net
working services to corporate customers.
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8. Campus Area Network (CAN)
This type of computer network follows the same prin
ciple as a LAN where different campus offices and or
ganisations can be linked together.
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9. Home Area Network (HAN)
This type of computer network is contained within a
userβs home that connects a personβs digital device
s and their peripheral devices such as a printer, teleph
one, DVDs, TVs, video games, home security system
s, appliances, etc.
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10. Network Topologies...
It is the logical layout of the cable and devices that co
nnect the nodes of a local area network.
The factors considered for this setup are β
β’ the type of computers and cabling
β’ the distance between computers
β’ the speed required around the network and
β’ the cost of setting up the network.
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11. Types of Network Topologies...
i. Bus Topology.
ii. Star Topology.
iii. Ring Topology.
iv. Mesh Topology.
v. Hybrid Topology.
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12. Bus Topology...
A bus topology uses one cable to which all the nodes
and peripheral devices are connected in series
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13. Star Topology...
The most common topology in which all the nodes are connected
to a device called a Hub and communicate through it.
The data packets travel through the hub and are sent to the attach
ed nodes, eventually reaching their destination.
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14. Ring Topology...
This topology connects the networkβs node in a circular chai
n, with each node connected to the next.
The last node connects to the first, completing the ring. Each n
ode examines data as it travels through the ring.
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15. Mesh Topology...
In this topology, a cable runs from every computer to every co
mputer with an advantage of confirmed delivery of data.
It is the least used network topology and most expensive to im
plement.
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