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Chapter 3
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Help you understand different types of servers
commonly found on a network including:
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File Server
Application Server
Mail Server
Proxy Server
Print Server
Backup Server
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Stores user data files.
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Network Operating System (NOS) allows accounts to
be set up.
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Requires username and password.
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Can only access your own files.
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Stores applications for use across networks.
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The application server can be used in two ways:
◦ For storing installation files which can easily be deployed
across client machines.
 Low network traffic but increase in required processing power at
client side.
◦ Allows applications that are installed on the server to be run
by client from the server side.
 High network traffic but less demand on processing at client side.
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Manages mail in and out of a network.
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Checks income emails for viruses
Filters out SPAM emails
Provides central address book for the organisation
Sets email and inbox sizes
Useful for both internal and external email.
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Used to cache web pages.
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When a request is made to a web server, a web page is
downloaded and displayed on the client’s computer. It
is also stored or ‘cached’ on the proxy server.
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Requests for the same page are then downloaded from
a proxy server which is much quicker than
downloading from the internet.
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Also act as a security buffer.
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Clients make a request for a file on a file server.
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The proxy intercepts the request and checks the
client’s authenticity.
◦ Checks validity of user and they have authorisation to
receive a file.
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Proxy then requests the file from the file server and
forwards it back to the client.
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The client never has direct access to the file server.
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Allows access to a shared printer.
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Usually come with spooler software.
◦ Spoolers collect jobs that have been sent to a printer, puts
them in a queue, and then forwards the print queue to the
printer.
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Printers work much slower than a computer. This is
why we use a spool.
◦ Computers would slow down if each file was sent to a printer
as the computer would have to wait for the printer to catch up
with it.
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The backup server backs up all data on the network.
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If all users save data on the server, the server can
automatically back-up files over night.
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This means that if data is lost it can be recovered.
◦ It may not be the most up to date version but it is better than
having to start again.
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It will usually make use of tape drives.
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Describe the following servers:
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A file server
A print server
A CD-ROM server
A mail server
A web server
A proxy server
Identify, Amplify and Exemplify