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2. Data Networks
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Sharing data through the use of floppy disks is not an efficient
or cost-effective manner in which to operate businesses.
Businesses needed a solution that would successfully
address the following three problems:
How to avoid duplication of equipment and resources
How to communicate efficiently
How to set up and manage a network
Businesses realized that networking technology could
increase productivity while saving money.
3. Networking Devices
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Equipment that connects directly to a network segment is
referred to as a device.
These devices are broken up into two classifications.
end-user devices
network devices
End-user devices include computers, printers, scanners, and
other devices that provide services directly to the user.
Network devices include all the devices that connect the enduser
devices together to allow them to communicate.
4. Hub
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Hubs concentrate
connections. In other
words, they take a group of
hosts and allow the network
to see them as a single unit.
This is done
passively, without any other
effect on the data
transmission.
Active hubs not only
concentrate hosts, but they
also regenerate signals.
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WAN Connection Types
Leased lines
– It is a pre-established WAN communications path
from the CPE, through the DCE switch, to the CPE
of the remote site, allowing DTE networks to
communicate at any time with no setup procedures
before transmitting data.
Circuit switching
– Sets up line like a phone call. No data can transfer
before the end-to-end connection is established.
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Remote Access Overview
A WAN is a data communications network
covering a relatively broad geographical
area.
A network administrator designing a
remote network must weight issues
concerning users needs such as
bandwidth and cost of the variable
available technologies.
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