IPS50SL02.ppt - Lesson 2 Explaining Intrusion Prevention...

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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-1 Lesson 2 Explaining Intrusion Prevention
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-2 Intrusion Detection Versus Intrusion Prevention
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-3 Intrusion Detection Systems An intrusion detection system has the capability to detect misuse and abuse of, and unauthorized access to, networked resources.
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-4 Intrusion Prevention Systems An intrusion prevention system has the capability to detect and prevent misuse and abuse of, and unauthorized access to, networked resources.
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-5 Intrusion Detection Technologies
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-6 Profile-Based Intrusion Detection Is also known as anomaly detection because activity detected deviates from the profile of normal activity Requires creation of statistical user and network profiles Is prone to high number of false positives; difficult to define “normal” activity
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-7 Signature-Based Intrusion Detection Is also known as misuse detection or pattern matching; matches pattern of malicious activity Requires creation of signatures Is less prone to false positives; based on the signature’s ability to match malicious activity
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-8 Protocol Analysis Intrusion detection analysis is performed on the protocol specified in the data stream. Examines the protocol to determine the validity of the packet Checks the content of the payload (pattern matching)
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-9 Intrusion Detection Evasive Technique
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-10 Evasive Techniques Attempts to elude intrusion prevention and detection use evasive techniques such as the following: Flooding Fragmentation Encryption Obfuscation
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-11 Flooding Saturating the network with “noise” traffic while also trying to launch an attack against the target is referred to as flooding.
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-12 Fragmentation Splitting malicious packets into smaller packets to avoid detection and prevention is known as fragmentation.
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© 2005 Cisco Systems, Inc. All rights reserved. IPS v5.0—2-13 Encryption Launching an attack via an encrypted session can avoid network-based intrusion detection and prevention. This type of evasive technique assumes that the attacker has already established a secure session with the target network or host.
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  • Summer '14
  • Cisco Systems, Network intrusion detection system, Intrusion detection system

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