ch13a_PC_LAN.PPT

Setting up a Peer-to-Peer PC Network

Copyright 2003 Prentice-HallPanko’s Business Data Networks and Telecommunications, 4th edition

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Peer-to-Peer PC Networks

No Dedicated Servers

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

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Peer-to-Peer PC Networks

No Dedicated Servers

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

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Advantages and Disadvantages

Advantage Avoid cost of purchasing a dedicated server No need to learn a server NOS

Disadvantages: Operational Difficulties If someone shuts off or crashes their PC, others

using its server will have service shut off or can even lose data.

Maximum size because of these operational difficulties is about 10, but 2-4 PCs is a more realistic size

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Disadvantages: Unreliability NOSs for servers are highly reliable

PC operating systems are not as reliable

More frequent crashes even if users are not at fault

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Disadvantages: Security On a dedicated

server, each user has an account and password

Access to resources can be limited by individual user

User LeePassword XYZ

User ChenPassword ABC

Chen may useLee may not

User-Level Security

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Disadvantages: Security On a client,

each shared resource is called a share

For instance, a printer

For instance, a hard disk directory

Share (Printer)

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Disadvantages: Security Passwords for

shares, not for users

All users share the same password

Passwords tend to be shared freely

Share (Printer A)Password: RTU

Print to Printer APassword RTU

Print to Printer APassword RTU

Share-Level Security

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Disadvantages: Security

Users are not experts in setting up shares

May accidentally share parts of their hard disk they should not be sharing

May give out share passwords appropriately

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Your LAN Card

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Your Computer Software

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Your Wiring: 4-Pair Unshielded TwistedPair Cable with RJ-45 Connector

RJ-45Connector

UTP Cord

Setting Up a PC to Provide Services to Others

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Setting Up a PC to Provide Service

Install NIC and Network software

Turn on File Service in General Go to Start, Settings, Control Panel (Windows 98)

Double click on Networking Icon

On the Configuration tab, choose File and Print Sharing

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Click onFile and PrintSharingTo enableSharingIn General

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Clicking on File and Print Sharing will take you to this dialog box

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Setting Up a PC to Provide Services

The Situation You have turned on print and file sharing

However, by default, all resources are not shared

So nothing is available to other users yet!

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Sharing Individual Resources Right click on directory or printer to be shared in

Explorer or My Computer Select Sharing Give the share a name Choose read-only or full access Choose a password for the resource You can choose two passwords—one for read-only

access, another for full access Give out passwords to approved people

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Share Name

Type of Access

Password(s)(Case-sensitive)

Sharing Tab

Get Read-Only or FullBased on What Password Typed

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Must go to Network dialog box’s Identification tab

Give the computer a name

Give the computer a workgroupname

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Recap

Turn on file and print sharing

Select resources to be shared and share them, giving password restrictions

Set up Identification tab to give the computer a name and specify its workgroup

Setting Up a PC to Use Services Provided by Others

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Setting Up a PC to Use Services

General Steps Install NIC and network software (Ch. 4a)

On the Network dialog box’s Identification tab Give the user’s computer a name Type in the workgroup name shared by all users

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Using Shared Files: Explorer or My Computer

In Explorer or My Computer, go to Network Neighborhood

The name of the computer sharing files should appear. Click on it

The names of shared directory resources should appeared. Click on the one you want

Type the password if one has been specified

You can read files. With full access can delete, etc.

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Using Shared Files: Explorer or My Computer

SharedDirectories

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Using Shared Files: In an Application Go to File Open (or Save)

Go to Network Neighborhood

The name of the computer sharing the directory should appear. Click on it

The names of shared directory resources should appeared. Click on the one you want

Type the password if one has been specified

You can now open files in the directory (or save a file in the directory)

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Using a Shared Printer You first must set up the printer on your PC

Go to Start, Settings, Printers (in Windows 98)

Choose Add Printer

In the Wizard, select Network Printer when asked how the printer is attached to the computer

Select the shared printer you wish to use

In applications, select this printer when you print and want the output to go to the printer

Shared Internet Access for a Peer-to-Peer PC Network

Using an Access Router

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Must have a broadband

connection and an access router

Shared Internet Access

Switch (needed forPeer-to-Peer networkinganyway

Cable Modem or DSL Modem to ISP

AccessRouter

UTP

UTP

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Access Router Front and Back

To Switch

To DSL orCable Modem

Front

Back

Router is about 10 cm (4”) Wide

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Many AccessRouters Now Have

A Built-In Switch


Access Router withBuilt-In Switch

Cable Modem or DSL Modem to ISP

UTP

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DHCP Access router has a built-in DHCP server

Gives private IP addresses to individual PCs

E.g., 192.168.1.5, 192.168.1.47, etc.

Gives other configuration information as well

Individual PCs must have “Obtain an IP address automatically selected on the Network Configuration tab

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Network Address Translation Translates between single IP address given by ISP

and DHCP-given IP addresses

Access Router withBuilt-In SwitchISP IP Address

10.0.0.23

192.168.1.5

192.168.1.23

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Firewall Router may or may not have a weak firewall PCs should have personal firewalls too

Perhaps a Weak Firewall Personal

Firewall

PersonalFirewall

ch13a_PC_LAN.PPT

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