Roles of a computer

Roles of a computer

1. Network

   • Computing devices linked in order to
     • communicate
     • Share information & resources

2. Client/server model

   • computing model
     • acts as a distributed application
       • partitions tasks or workloads between
         • servers
           • providers of a resource or service
         • clients
           • Service requesters

3. Roles

   • Client
     • app or system
       • accesses a service made available by a server
     • accesses the service by way of a network
     • specific types of clients
       • web browsers
       • email clients
       • online chat clients
   • server
     • host running one or more server programs
     • share their resources with clients
     • specific types of server
       • Web servers
         • web content that can be accessed through the internet
       • Ftp servers
         • transfer files from one host or to another host
       • application servers
         • software applications
           • security
           • data services
           • transaction support
       • Database server
         • provide database to other computer programs or computers
       • Name servers
         • hosts a network service for providing responses to queries against a directory service
         • DNS server
           • Domain Name System
       • File server
         • Store files in a network
   • Firewall
     • keep a network secure
     • control the incoming and outgoing network traffic
   • Router
     • Wi-Fi

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