16-01-2012, 01:07 PM
Network Security
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Overview
.What is security?
.Why do we need security?
.Who is vulnerable?
.Common security attacks and countermeasures
-Firewalls & Intrusion Detection Systems
-Denial of Service Attacks
-TCP Attacks
-Packet Sniffing
-Social Problems
What is “Security”
Dictionary.com says:
-1. Freedom from risk or danger; safety.
-2. Freedom from doubt, anxiety, or fear; confidence.
-3. Something that gives or assures safety, as:
.1. A group or department of private guards: Call building security if a visitor acts suspicious.
.2. Measures adopted by a government to prevent espionage, sabotage, or attack.
.3. Measures adopted, as by a business or homeowner, to prevent a crime such as burglary or assault: Security was lax at the firm's smaller plant.
…etc.
Why do we need security?
-Protect vital information while still allowing access to those who need it
Trade secrets, medical records, etc.
-Provide authentication and access control for resources
Ex: AFS
-Guarantee availability of resources
Ex: 5 9’s (99.999% reliability)
