high speed internet access at home broadband technologies security concerns hardware/software...
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High Speed Internet Access At Home
Broadband TechnologiesSecurity Concerns
Hardware/Software Solutions
William Kramp 4/12/2001
Broadband TechnologiesBroadband Technologies
Cable MODEMSDigital Subscriber Line (DSL)Fixed WirelessMobile WirelessIntegrated Services Digital Network (ISDN)
Cable MODEMSCable MODEMS
Always “On”, shared connection. Uses the Time-Warner cable connection. Doesn’t
interfere with use of cable when watching TV.Consumer Transfer Speeds:
Download: 2Mbps, Upload: 128KbpsCommercial Transfer Speeds:
Download: 4Mbps, Upload: 768Kbps
Transfer speedsTransfer speeds
DownloadThis is the speed at
which files can be downloaded from the Internet. Examples: viewing a video feed, looking at web pages.
UploadThis is the speed at
which files can be sent up to the Internet. Examples: sending E-mail to a friend, uploading a document to a web site.
Digital Subscriber Line (DSL)
Digital Subscriber Line (DSL)
Always “on”, dedicated connection to a provider. Uses existing phone line. Doesn’t interfere with,
or block the regular use of the phone.Transfer speeds:
Speeds vary by service provider. Can range from 256Kbps to 8Mbps.
Symmetrical or asymmetrical connections
Symmetrical vs Asymmetrical
Symmetrical vs Asymmetrical
SymmetricalThe upload speed
equals the download speed. Good if you are doing work from home.
AsymmetricalThe download speed
is much greater then the upload speed. Good if only downloading from the Internet.
Fixed WirelessFixed Wireless
Wireless Internet access to a fixed location (your home) without using cable or phone wires.
Symmetrical connections up to 10Mbps.Not effected by adverse weather conditions.Very reasonable rates compared to T1 or fractal
T3 hardwire connections.
Mobile WirelessMobile Wireless
Current 2nd generation technology is not very fast or reliable.
Third generation (3G) technology will allow average speeds of 50-70Kbps on 144Kbps networks while moving. Speeds of 500Kbps on 2.4Mbps networks will be possible if stationary.
Expected timeframe for 3G rollout in US is 2004.
Integrated Services Digital Network
Integrated Services Digital Network
ISDN has been around for about 15 years.Speeds of 128Kbps, symmetrical available.Charged by the minute, plus Internet access fee.
Security IssuesSecurity Issues
VirusesDenial of ServiceProbingTrojan horsesSpying
VirusesViruses
PC’s can be infected from many sources:E-mailSoftware on floppiesSoftware on CD’sFile sharing over a networkInternet downloads
Denial of Service Attacks (DoS)
Denial of Service Attacks (DoS)
These are attacks against a system to make it unavailable to the user.
This is done by sending so much information, or junk, to ports on your PC. This causes the PC to overload, and stop functioning.
Famous DoS: Smurf attack
ProbingProbing
Probing is the process of looking for ports, or services on a computer.
Well known ports: smtp (E-mail), http (web),etc.Addresses easily spoofed. Meaning that the
source address might be fake, a decoy.If file and printer sharing is enabled, people
could view, add or change files on your PC.
Trojan HorsesTrojan Horses
Programs that say they are doing one thing, but are actually doing something else.
Usually allow people to remotely use your PC to attack, or access other computers on the Internet.
The trail will then lead back to you, and not the real perpetrator.
SpyingSpying
Spying is where programs watch what you are doing and send out this information without your knowledge.
RealAudio, which provides audio and video streaming software for the Internet. Had their program sending reports to the company of what files were being transferred, but said it was just for quality control. Can now be disabled.
Hardware/Software Solutions
Hardware/Software Solutions
Virus ScannersBackupsFirewalls
Virus ScannersVirus Scanners
McAfee http://www.mcafee.comNorton http://www.symantec.comVirus Myths http://www.vmyths.com/
These will scan files and E-mail for viruses. But still be wary of opening programs or files that you didn’t request.
BackupsBackups
Zip Drives – 100MB capacity. CD-R Drives – 600MB capacity; write once.CD-RW Drives – 600MB capacity; can be
reused.Jaz Drives – 1GB capacity.Tape Drives – 8GB to 20GB storage capacity.
Internal or external units available.
FirewallsFirewalls
Firewall software – Software that is installed on each computer to protect, and restrict access to its services.
Firewall appliance – A self-contained unit that protects the computers on an internal network from the outside (Internet). Will work with either a Road Runner MODEM or DSL connection.
Firewall SoftwareFirewall Software
ZoneAlarm http://www.zonelabs.comFree, for non-commercial use
BlackICE Defender http://netice.comMcAfee Personal http://www.mcafee.comNorton Internet Sec.
http://www.symantec.com
Firewall AppliancesFirewall Appliances
Linksys http://www.linksys.comD-Link http://www.dlink.comSonicWall http://www.sonicwall.comSMC http://www.smc.com