Servers

1
Servers

• Chapter 3

2
This presentation will

• Help you understand different types of servers
  commonly found on a network including
• File Server
• Application Server
• Mail Server
• Proxy Server
• Print Server
• Backup Server

3
File server

• Stores user data files.
• Network Operating System (NOS) allows accounts to
  be set up.
• Requires username and password.
• Can only access your own files.

4
Application Server

• Stores applications for use across networks.
• 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.

5
Mail server

• Manages mail in and out of a network.
• 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.

6
Proxy server

• Used to cache web pages.
• When a request is made to a web server, a web
  page is downloaded and displayed on the clients
  computer. It is also stored or cached on the
  proxy server.
• Requests for the same page are then downloaded
  from a proxy server which is much quicker than
  downloading from the internet.

7
Proxy server (cont.)

• Also act as a security buffer.
• Clients make a request for a file on a file
  server.
• The proxy intercepts the request and checks the
  clients authenticity.
• Checks validity of user and they have
  authorisation to receive a file.
• Proxy then requests the file from the file server
  and forwards it back to the client.
• The client never has direct access to the file
  server.

8
Print server

• Allows access to a shared printer.
• 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.
• 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.

9
Backup Server

• The backup server backs up all data on the
  network.
• If all users save data on the server, the server
  can automatically back-up files over night.
• 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.
• It will usually make use of tape drives.

10
Activity

• Describe the following servers
• A file server
• A print server
• A CD-ROM server
• A mail server
• A web server
• A proxy server
• Remember Identify, Amplify and Exemplify