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  • Количество слайдов: 17

Server Application Software • File Service Allows File Sharing – File server stores program Server Application Software • File Service Allows File Sharing – File server stores program and data files – Can be accessed by any user with access rights – Built into most SOSs Access Rights File Server No Access Rights

Server Application Software • File Service – For sharing application program files also – Server Application Software • File Service – For sharing application program files also – No need to install applications on each PC • Greatly reduces installation labor File Server

Server Application Software • File Server Program Access – Program is STORED on the Server Application Software • File Server Program Access – Program is STORED on the file server File Server

Server Application Software • File Server Program Access – But program is EXECUTED on Server Application Software • File Server Program Access – But program is EXECUTED on the client PC – Limited by power of client PCs, which do not get very large File Server

Server Application Software • Typical Application Software – Word processing, e-mail, etc. – Must Server Application Software • Typical Application Software – Word processing, e-mail, etc. – Must buy multiuser versions, not just a single copy from a retail store – License will limit the number of users – Will cost more than the SOS

Server Application Software • Print Service – – Also built into SOSs Print jobs Server Application Software • Print Service – – Also built into SOSs Print jobs go to shared printers But they first go to the file server Not directly to the print server! Print Server File Server Client PC Shared Printer

Server Application Software • Print Service – File server stores print job in a Server Application Software • Print Service – File server stores print job in a print queue until print server is ready to print it – File server sends the print job to the print server Print Server File Server Shared Printer

Server Application Software • Print Server – Print server feeds the print job to Server Application Software • Print Server – Print server feeds the print job to the printer – Print servers are simple and inexpensive because the file server does most of the work – Low print server cost allows shared printers can be scattered throughout the office Print Server File Server

Server Application Software • Print Server – Connects to printer via parallel port on Server Application Software • Print Server – Connects to printer via parallel port on the print server; no special printer needed – Has NIC to connect to the hub or switch – Requires an RJ-45 port on the hub or switch RJ-45 Port Print Server UTP Parallel Cable

Server Application Software • Print Server Location – Parallel cable distance limitation requires print Server Application Software • Print Server Location – Parallel cable distance limitation requires print server to be within 1 -2 meters of the printer – UTP allows print server to be up to 100 meters from the hub or switch RJ-45 Port UTP (up to 100 m) Parallel Cable (1 -2 m only) Print Server

Server Application Software • Remote Access Service (RAS) – – User dials into a Server Application Software • Remote Access Service (RAS) – – User dials into a remote access server Server authenticates the user (user must prove identity) If authenticated, user may use internal services Client PC needs RAS software RAS Client RAS Internal Software Server Dial-Up Telephone Line Dial-In LAN Client

Server Application Software • Internet Access for a Simple PC LAN – Serial Router Server Application Software • Internet Access for a Simple PC LAN – Serial Router – Simple, inexpensive router – One RJ-45 port for LAN, one suitable port for ISP Connection Access Line Serial Router

Server Application Software • Serial Routers – May provide security to stop outside hackers Server Application Software • Serial Routers – May provide security to stop outside hackers • Network address translation (NAT) hides addresses of internal machines • Only serial router’s IP address appears in outgoing packets Serial Router Access Line IP Packet with Serial Router’s IP Address

Server Application Software • Serial Routers – Provide security to stop outside hackers • Server Application Software • Serial Routers – Provide security to stop outside hackers • May provide a firewall (discussed in Chapter 10) to prevent unauthorized access from Internet hackers Serial Router Access Line

Server Application Software • Directory Servers – Problem: Most networks have many servers – Server Application Software • Directory Servers – Problem: Most networks have many servers – To use a resource, must know the server • To send e-mail, address is [email protected] • Files must be accessed on particular servers

Server Application Software • Directory Servers – Directory server knows all resources on all Server Application Software • Directory Servers – Directory server knows all resources on all servers – Can send mail to user (without @server) – Can search for a specific file across servers Directory Server

Server Application Software • Directory Servers – Know user access rights on all servers Server Application Software • Directory Servers – Know user access rights on all servers – Single login to directory server – Get access to all other servers where user has access rights Directory Server Single Login