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19 Computer networks
Local Area Network
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19 Computer networks
Wide Area Network
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19 Computer networks
Network security measures are needed to protect
programs and data from the threats that come from other
users and hackers.
Data can be kept secure by:
giving each network user their own user identity and
password;
reducing unauthorised access by allowing users different
levels of access;
physically restricting access to computer rooms by locking
doors or providing users with entry codes or special swipe
card keys.
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19 Computer networks
The topology of a network describes the way cables are
used to connect network devices like servers, workstations
or printers.
In a bus topology all the computers are connected through
their own cable to a single central cable - this is the
simplest type of topology.
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19 Computer networks
In a ring topology computers are connected to each other
forming a large circle.
Data is sent around the ring until it reaches its final
destination.
A problem with this topology is that if one computer fails
the entire network will break down this is one reason why
ring topologies are not used much anymore.
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