3.1 Types of Servers.

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Presentation transcript:

3.1 Types of Servers

What You Need To Know application database hypervisor

File/print Application Database Web Mail Hypervisor

Hardware also runs special server software to manage services

LAN Example Client Devices WAP Switch Server

Web Server Database Server Logon Server File Server Print Server

Local Area Network Wide Area Network (eg the Internet) Server Farm Mail Server Firewall Web Server Client Devices

Server-based processing is… ‘Remote’ Data Centre Client

Server-based processing is… Secure Data Centre Client

Server-based processing is… Reliable Backups Updates Data Centre Client

Server-based processing is… ‘Scalable’ Data Centre Server Client

Server-based processing is… General Advantages Server-based processing is… ‘Remote’ Processing done on different site Secure Only authorised access Backups Reliable Updates ‘Scalable’ Expand with demand

File/print Application Database Web Mail Hypervisor

Stores large number of files for an organisation File Server Stores large number of files for an organisation Also controls security, such as access rights to files Finally, handles backups in case of accident or disaster

Manages queue of docs for printing Print Server Manages queue of docs for printing So shares load of print requests across available devices Controls access to printers for users & routes docs to devices

Installs, updates & controls access to programs Application Server Installs, updates & controls access to programs Includes basic applications such as word processor or email But also specialised software, such as for financial staff only

Manages security & updates to large databases Database Server Manages security & updates to large databases For example in a school, security means controlling access to staff So teachers update registers & office staff update financial data

Web Server

Stores all files for a website Web Server Stores all files for a website Sends them when user’s browser sends a request for the website Web server then sends the site’s files using the HTTP protocol

Stores & forwards emails like an electronic post office Mail Server Stores & forwards emails like an electronic post office Data traffic controlled by protocols, eg SMTP (send) & POP (receive) But email traffic is not immediate like instant messaging or ‘chat’

Software that allows a host machine to run guest machines Hypervisor Server Software that allows a host machine to run guest machines Acts like a ‘supervisor’ that shares resources between the guest machines eg different OS