§Are expensive and
generally slow.
§Need a good firewall
to restrict outsiders from entering and disrupting the network.
§Setting up a network
can be an expensive and complicated experience. The bigger the network the more
expensive it is.
§Security is a real issue when many different people have the ability to
use information from other computers. Protection against hackers and viruses
adds more complexity and expense. 
§ Once set up, maintaining a network is a full-time job which requires
network supervisors and technicians to be employed.
§
Information may not meet local needs or interests.
§
Vulnerable to hackers or other outside threats.
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