Q. Will an
internet filter be able to block all undesirable sites?
A. NO internet filter is 100%
effective. Occasionally an unwanted site may appear to the user if
they make a concerted effort to find one that does not trigger the
filtering mechanism, and sometimes even if they are not.
Also, there are many sites that border on obscenity depending on
your perspective; for example, a medical gynecology site may be considered
essential for research by some, but offensive by others. A religious
site may be perfect for one person but offensive to another. There
are many times when people's interpretations vary from one another,
and for this reason internet filters frequently err on the side of
caution - if a site may offend somebody then it is made inaccessible.
Much debate surrounds the effectiveness of internet filters for this
Q. What are Client-Based and Server-Based
A. A client based filter is generally a software
product which runs on the user's machine at the same time as the
browser that is used for internet access. The filter is responsible
for rejecting inappropriate materials before they are handed to the
A Server based filter provides the filtering component
remotely to the user machine, via the internet or a network. In other
words, the filtering is done before the data is sent to the client
(end user's) machine. In this way, the filtering component cannot
be circumvented, as the actual incoming connection has data that
has already been filtered. It is sometimes possible to bypass a client-based
filter with advanced network skills.
A server based filter is usually more expensive
and complicated and often incurs an ongoing cost for use of the remote
filtering service, whereas the client based filter is usually a stand-alone
product requiring no maintenance fees.