presentation viewer : _ mahmoud matter. ahmed alasy dr: rasha atallah

Presentation viewer_Mahmoud matterAhmed alasy

Introduction to Business information processing

Dr Rasha Atallah

Configuring

a Wireless Network

Wireless net

1048708 Wireless networks are growing inpopularity1048708 Instead of CAT5 network cableswireless networks use radio waves tocommunicate with each other Most of todayrsquos wireless networks are

based on the IEEE 80211 standard

Introduction-

80211bbull Limited to 11 Mbps 24 GHzbull Most popular for hot-spots and home use 82011g 54 Mbps or higher 24 GHzbull Newer technology gaining popularity 80211a 11Mbps 58 GHzbull Primarily secure sites Less interference

-Wireless Network Types

Connection componentsfor wider accessbull PCI cards that accept

wireless PC cardsbull External USB wireless

NICs

-Wireless Networking Components

LinkSys now owned by Cisco

Wireless Networking Components-

bull Wireless Access Point (WAP) Acts like a hub to the wireless PCs

Wireless Access Point-

Wireless devices use the same networking clients andprotocol as wired networks (TCPIP) Wired networks are always inherently more securethan wireless networks Wireless network speeds are approaching wirednetwork speeds of 100 Mbps Wireless networking software utility usually providedwith the wireless NIC to configure wireless settings Windows XP has built-in zero configuration utility for

wireless networks (SP2 is much improved)

-Wireless Networking Software

Ad hoc Todebull Each wireless PC is in

direct contact with otherPCs in a decentralizedfree-for-allbull Called peer-to-peer

modebull Good for a few

computers as atemporary network

-Wireless Network modes

Infrastructure Modebull Use WAPs to connect

wireless PCs to a wirednetworkbull A single WAP is called

a Basic Service Set(BSS)

bull Additional WAPs createan Extended BasicService Set (EBSS)

-Wireless Network modes

Ad-hoc Modebull Does no require a Wireless Access Point (WAP)bull Each wireless PC needs to be configured with the samebull network name (SSID)bull May need to select a common channelbull Configure unique host IP addresses (no DHCP)bull Configure File and Printer Sharing (Workgroup) Infrastructure Modebull Requires a Wireless Access Point (WAP)bull All nodes need to be configured the samebull Configure the WAP and client PCs to match the chosen

options

-Configuring Wireless Networks

Service Set Identifier (SSID)bull Configure a unique SSID or network namebull Each PC needs to use the WAPrsquos SSIDbull Not secure without encryptionMAC Filteringbull Filtering based on each hostrsquos MAC address

(unique number burned into every NIC)bull Creates a list of accepted or denied users

-Wireless Networking Security

New standards are in the works80211i is a new standard that will add

Advanced Encryption Standard (AES)technology for improved securityhome wireless media networks andpossibly voice-over-IP telephony

-Wi-Fi Security

Configuring a Wireless Access Point(WAP )is usually done through a web

browserbull Enter the WAPrsquos default IP address in your

browser (usually 19216811)bull Enter the default administrative password

(in your documentation )to log in

-Configuring Wireless Networks

WAP default settings are not secureChange the default admin passwordChange the default SSIDTurn on encryption (WEP or WPA)Turn off SSID broadcast (unless required)Change the default IP Address of the WAPOptional Utilize MAC Filtering to prevent

unauthorized users

-Configuring Wireless Networks

Signal strength depend on distance aswell as possible obstructionsWalls floors and other objects caneasily obstruct a wireless signalCordless phones microwave ovens and

other electronic devices can also affectthe signal quality

-Signal Strength Problems

Increased Mobility bullSimple and Flexible Installation

bullNo need for wiring bullIdeal for listed buildings or private homes

-Advantages

1 _Can be breached or disturb them unless the technical

procedures and security requirements

2 - transport distances are short compared to wired networks

3 - Initial cost to run almost three times higher than those of

wired

4 - problems in the overlap and confusion in the event there is

more than a wireless network in a single building or a

nearby building very soon

- disadvantages

The END

THANKS FOR ALL OF YOU WHO

LISTENED TO US