11 configuring tcp/ip addressing and security chapter 11
TRANSCRIPT
11
CONFIGURING TCP/IP ADDRESSING AND SECURITY
Chapter 11
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OVERVIEW
Understand IP addressing
Manage IP subnetting and subnet masks
Understand IP security terminology
Manage Internet security features of Windows XP
Configure and troubleshoot Windows Firewall
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UNDERSTANDING BINARY NUMBERS
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CONVERTING DECIMAL ADDRESSES TO BINARY
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CONVERTING BINARY ADDRESSES TO DECIMAL
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USING CALCULATOR TO CONVERT NUMBERS
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SUBNET MASKS
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PROBLEMS WITH CLASSFUL ADDRESSES
Wasted addresses
Shortage of address blocks
Excessive routing table entries
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SUBNETTING A LARGE NETWORK
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CLASSLESS INTERDOMAIN ROUTING (CIDR)
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SUPERNETS
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SECURING IP COMMUNICATIONS
Internet threats
Protective technologies
Configuring and managing Windows Firewall
Monitoring Internet communications security
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INTERNET THREATS
Viruses (the oldest threat)
Worms (the most persistent threat)
Trojan horses
Spyware
Zombies
Direct hacking
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VIRUSES
Take advantage of gullible users
Infect document, graphics, andexecutable files
Often include mass-mailing components
Can carry destructive payloads
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WORMS
Self-replicating
Network-aware
Use bugs in programs or systems to spread
Can carry viruses or other payloads
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TROJAN HORSES
Usually e-mailed or downloaded
Appear to be a useful program or game
Carry payload or back door application
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SPYWARE
Has attributes of Trojan horses or worms
Spies on its victim
Might transmit marketing data or transmit personal data to the spyware author
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ZOMBIES
Payload of worm or Trojan horse
Remotely controlled to attack network targets
Participate in large-scale assaults on public Web sites
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DIRECT HACKING
Relatively low incidence
Hardest form of attack to defeat
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PROTECTIVE TECHNOLOGIES
Security Center
Windows Firewall
Internet Connection Sharing (ICS)
Third-party utilities
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SECURITY CENTER
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FIREWALL TERMINOLOGY
Packet filtering
Stateful packet filtering
Exceptions (packet filter rules)
Allowed traffic
Rejected traffic
Logging
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ENABLING WINDOWS FIREWALL
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FIREWALL EXCEPTIONS
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ADVANCED WINDOWS FIREWALL SETTINGS
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MONITORING INTERNET SECURITY
Windows Firewall monitoring
Service logs
Event logs
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WINDOWS FIREWALL ALERTS
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WINDOWS FIREWALL LOGS
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SERVER LOGS
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SUMMARY
IP addresses are 32-bit binary addresses.
The network portion of IP addresses determines location.
CIDR allows creation of custom netblocks.
CIDR permits use of variable-length subnet masks.
Windows Firewall blocks unauthorized packets.
Windows Firewall exceptions allow specified traffic to pass through the firewall.
Alerts and logs warn of attempted attacks.