Setting up a Peer-to-Peer PC
Network
Chapter 11a
Copyright 2003 Prentice-Hall
Panko’s Business Data Networks and Telecommunications, 4thedition
2
Peer-to-Peer PC Networks
z No Dedicated Servers
z Clients Provide Services to One Another
A B
A can print to B’s printer B’s printer appears to be a local printer once it is set up on A
3
Peer-to-Peer PC Networks
z No Dedicated Servers
z Clients Provide Services to One Another
A B
B can store files to parts of A’s hard disk, retrieve files from parts of A’s hard disk
4
Advantages and Disadvantages
z
Advantage
zAvoid cost of purchasing a dedicated server
zNo need to learn a server NOS
z
Disadvantages: Operational Difficulties
zIf someone shuts off or crashes their PC, others using its server will have service shut off or can even lose data.
zMaximum size because of these operational difficulties is about 10, but 2-4 PCs is a more realistic size
5
Advantages and Disadvantages
z
Disadvantages: Unreliability
zNOSs for servers are highly reliable
zPC operating systems are not as reliable
zMore frequent crashes even if users are not at fault
6
Advantages and Disadvantages
z
Disadvantages:
Security
zOn a dedicated server, each user has an account and password
zAccess to resources can be limited by individual user
User Lee Password XYZ
User Chen Password ABC
Chen may use Lee may not
User-Level Security
7
Advantages and Disadvantages
z
Disadvantages:
Security
zOn a client, each shared resource is called a share
zFor instance, a printer
zFor instance, a hard disk directory
Share (Printer)
8
Advantages and Disadvantages
z
Disadvantages:
Security
zPasswords for shares, not for users
zAll users share the same password
zPasswords tend to be shared
freely Share (Printer A)
Password: RTU Print to Printer A Password RTU
Print to Printer A Password RTU
Share-Level Security
9
Advantages and Disadvantages
z
Disadvantages: Security
zUsers are not experts in setting up shares
zMay accidentally share parts of their hard disk they should not be sharing
zMay give out share passwords appropriately
Setting Up a PC to Provide Services to
Others
11
Setting Up a PC to Provide Service
z
Install NIC and Network software (see Ch. 4a)
z
Turn on File Service in General
zGo to Start, Settings, Control Panel (Windows 98)
zDouble click on Networking Icon
zOn the Configuration tab, choose File and Print Sharing
12
Setting Up a PC to Provide Service
Click on File and Print Sharing To enable Sharing In General
13
Setting Up a PC to Provide Service
z
Clicking on File and Print Sharing will take you
to this dialog box
14
Setting Up a PC to Provide Services
z
The Situation
zYou have turned on print and file sharing
zHowever, by default, all resources are not shared
zSo nothing is available to other users yet!
15
Setting Up a PC to Provide Services
z
Sharing Individual Resources
zRight click on directory or printer to be shared in Explorer or My Computer
zSelect Sharing
zGive the share a name
zChoose read-only or full access
zChoose a password for the resource
zYou can choose two passwords—one for read-only access, another for full access
zGive out passwords to approved people
16
Setting Up a PC to Provide Services
Share Name
Type of Access
Password(s) (Case-sensitive) Sharing Tab
Get Read-Only or Full Based on What Password Typed
17
Setting Up a PC to Provide Services
Must go to Network dialog box’s Identification tab Give the computer a name Give the computer a workgroup name
18
Setting Up a PC to Provide Services
z
Recap
zTurn on file and print sharing
zSelect resources to be shared and share them, giving password restrictions
zSet up Identification tab to give the computer a name and specify its workgroup
Setting Up a PC to Use Services
Provided by Others
20
Setting Up a PC to Use Services
z
General Steps
zInstall NIC and network software (Ch. 4a)
zOn the Network dialog box’s Identification tab
zGive the user’s computer a name
zType in the workgroup name shared by all users
21
Setting Up a PC to Use Services
z
Using Shared Files: Explorer or My Computer
zIn Explorer or My Computer, go to Network Neighborhood
zThe name of the computer sharing files should appear. Click on it
zThe names of shared directory resources should appeared. Click on the one you want
zType the password if one has been specified
zYou can read files. With full access can delete, etc.
22
Setting Up a PC to Use Services
z
Using Shared Files: Explorer or My Computer
Shared Directories
23
Setting Up a PC to Use Services
z
Using Shared Files: In an Application
zGo to File Open (or Save)
zGo to Network Neighborhood
zThe name of the computer sharing the directory should appear. Click on it
zThe names of shared directory resources should appeared. Click on the one you want
zType the password if one has been specified
zYou can now open files in the directory (or save a file in the directory)
24
Setting Up a PC to Use Services
z
Using a Shared Printer
zYou first must set up the printer on your PC
zGo to Start, Settings, Printers (in Windows 98)
zChoose Add Printer
zIn the Wizard, select Network Printer when asked how the printer is attached to the computer
zSelect the shared printer you wish to use
zIn applications, select this printer when you print and want the output to go to the printer
Shared Internet Access in a Peer-
to-Peer PC Network
Using an Access Router
26 Must have
a broadband connection and an access router
Shared Internet Access
Switch (needed for Peer-to-Peer networking anyway
Cable Modem or DSL Modem to ISP
Access Router
UTP UTP
27
Shared Internet Access
z
Access Router Front and Back
To Switch To DSL or
Cable Modem Front
Back Router is
about 10 cm (4”) Wide
28 Many Access
Routers Now Have A Built-In Switch
Shared Internet Access
Access Router with Built-In Switch Cable Modem or DSL Modem to ISP
UTP
29
Shared Internet Access
z
DHCP
zAccess router has a built-in DHCP server
zGives private IP addresses to individual PCs
zE.g., 192.168.1.5, 192.168.1.47, etc.
zGives other configuration information as well
zIndividual PCs must have “Obtain an IP address automatically selected on the Network Configuration tab
30
Shared Internet Access
z
Network Address Translation
zTranslates between single IP address given by ISP and DHCP-given IP addresses
Access Router with Built-In Switch ISP IP Address
10.0.0.23
192.168.1.5
192.168.1.23
31
Shared Internet Access
z
Firewall
zRouter may or may not have a weak firewall
zPCs should have personal firewalls too
Perhaps a
Weak Firewall Personal
Firewall
Personal Firewall
