Chapter 9: Resource Sharing Over A Network

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Chapter 9 Resource Sharing Over A Network
Lecture 11 The second of 2 lectures on Chapter 9

• A Guide to Operating Systems Troubleshooting
  and Problem Solving

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Chapter Objectives

• Explain the principles behind sharing disks and
  files on a network
• Explain how to set up accounts, groups, security,
  and disk and file sharing on network server
  operating systems
• Explain how to set up file and disk sharing on
  client operating systems
• Explain how to set up printer sharing on server
  and client operating systems
• Discuss how network and Internet servers are used
  for vast information sharing networks

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Accessing and Sharing With Macintosh

• Mac OS offers two ways to connect to shared
  resources on a network
• Chooser
• Network Browser
• Mac OS uses the terminology mount when accessing
  a shared disk volume over the network
• Mac Network Browser presents an interface that is
  similar to a Windows drop-down or scroll box
• Mac OS have two users already defined Owner and
  Guest

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Using the Chooser
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Creating a New User

• Create a new user
• Provide the users name
• Provide a password
• Enable the user to change her or his password (an
  optional check box)
• Enable sharing and allow the user to link to
  programs on the computer
• After a user is created, it can be added to one
  or more groups

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Privileges

• Four kinds of privileges
• None No access to files
• Read only Access to read the contents of files
  only
• Write only Access to write files but not to
  open them
• Read Write Access to open and write files
• Privileges can be assigned to any of four types
  of users
• Owner - Users
• Groups - Everyone

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Accessing and Sharing with UNIX

• UNIX computers can access resources on other
  computers that support the Network File System
  (NFS)
• UNIX client accesses the shared disk or folder
  through its mount command
• The NFS server acts as a two-way utility, because
  it also permits a Windows NT Server or NT
  Workstation to access a computer running UNIX
• NFS is an addon--Unix not originally a network O/S

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UNIX Share Permissions

• These permissions include
• Root includes all permissions and is similar to
  full control
• Read-write encompasses permissions to mount the
  shared disk or folder, read the contents, and
  modify the files and folders
• Read-only gives permission to mount the shared
  resources, but only to read the contents of files
  and folders
• No access prevents mounting the shared disk or
  folder

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Accessing and Sharing With Windows 95/98

• Windows 95/ 98 have nearly the same capabilities
  to access shared disks and folders
• Both also can offer shared resources for other
  network workstations to access
• Share-level access control creates a disk or
  directory share that is protected by share
  permissions
• User-level access control requires the share
  owner to create an access list of groups and users

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Share Level Access Permissions

• There are three levels of access permissions
• Read-Only
• Full
• Depends On Password
• Read-only and Full permissions can be assigned
  with or without a password
• Default - uses no password
• User-level access specifies access on the basis
  of user accounts and groups

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Windows 95 and Windows 98 Access Control
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User and Group Access in Windows 95/ 98

• Three kinds of access
• Read-only
• Full
• Custom
• Before setting up share-level access or
  user-level access, it is necessary to install
  file and printer sharing services

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Windows 95/98 Custom Share Permissions for
User-Level Access
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Windows 95/ 98 Drive Mapping

• To map a drive that is shared by another computer
  use the Network Neighborhood utility
• To disconnect a mapped drive, right-click the
  drive in My Computer or Explorer and click
  Disconnect on the menu

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Installing a Protocol in Windows 2000 Server
Note the role of the redirector too!
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Sharing Printing Devices in Macintosh

• Mac OS can make a local printer connected to it
  available to others on a network
• Use the Chooser utility
• To share a printer, first install the printer and
  set it up in the Mac OS
• In the Sharing Setup, share this Printer and
  enter a name for the shared printer
• Optional parameters can enable a password
  required by others

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Sharing Printing Devices in NetWare

• Shared printing in NetWare is accomplished by
  using two different approaches
• queue-based printing
• Novell Distributed Print Services (NDPS)
• In queue-based printing, network administrator
  performs several functions
• install the printer and its driver in NetWare
• create a print queue for the printer
• set up a NDS printer object for NetWare that uses
  NDS
• load the print server on the NetWare server

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Sharing Printing Devices in UNIX

• The BSD or the SVR4 spooling systems use three
  components for printing
• the lpr print program
• the ldp daemon
• the file, \etc\printcap
• In SVR4, the spooling system consists of the lp
  print program and the lpsched daemon

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Sharing Printing Devices in Windows 95/ 98 and
Windows NT

• Windows 95/ 98 and Windows NT use the Add Printer
  Wizard to set up a printer locally
• Share a printer by first opening the Printers
  folder
• Click Sharing and then click the Shared As
  radio button
• Enter a name for the shared printer and a comment
  to describe it
• In Windows 95/ 98, if share-level access is used
  then you also have the option to require a
  password

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Sharing a Printer in Windows 98
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Setting Up Shared Printer Parameters in Windows 98
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Sharing Printing Devices in the Windows NT Family

• In Windows NT 4.0 there are two printer property
  tabs
• Sharing
• Security
• Windows NT share permissions are
• No Access
• Print
• Manage Documents
• Full Control

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Windows NT Shared Printer Security
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Mapping to a Shared Printer

• Open Network Neighborhood and double-click the
  computer that offers the shared printer
• The list of shared resources, right-click the
  printer and click Install from the menu

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Network and Internet Resource Servers

• NetWare, UNIX, and Windows NT Server can be set
  up as resource servers to provide network and
  Internet resources
• All of these operating systems can act as servers
  for many kinds of functions
• e-mail snmp vs imap
• electronic commerce
• videoconferencing
• multimedia
• Client/server applications vs hierarchical
  networks

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More About Network and Internet Resource Servers

• A typical client/server application consists of
  three components
• a workstation running a Windows-based operating
  system
• a server from which to run applications
• one or more database servers
• Web servers are another fast-growing
  implementation of NetWare, UNIX, and Windows NT
  Servers

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Chapter Summary

• Networks were designed to share files other
  resources
• Originally, networks used protocols such as FTP
  to upload and download individual files
• One way to distinguish network-capable operating
  system is by classifying them as server or client
  operating systems

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Posting Questions

• Research XML as a protocol. What are its
  advantages and disadvantages?
• Research Samba as a protocol. What are its
  advantages and disadvantages?

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End