In Client-Server model, server controls the network.In P2P network, all the PCs act as both clients and servers.A Mail server is an application that receives e-mail from local net users, remote users and delivers these e-mails to the intended users.Name resolution is the process of mapping computer names to their associated IP addresses and this service is provided by DNS.Domain Name System (DNS) maps Fully Qualified Domain Name (FQDN) to corresponding IP address.DHCP provides temporary IP address with a particular amount of lease time.Windows Internet Name Service maps Network Basic Input/Output System (NetBIOS) computer names to corresponding IP addresses.A network operating system (NOS) deals concurrent requests from clients and provides the security necessary in a multi-user environment.
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