IDPS Terminology

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Questions and Answers

What is a limitation of HIDPS in terms of attack detection?

It requires frequent software updates

It can only detect attacks on a single device

It can detect all types of attacks

It is not aware of attacks that span multiple devices in the network (correct)

What type of detection method involves examining network traffic for known attack patterns?

Signature-based detection (correct)

Behavioral-based detection

Anomaly-based detection

Stateful protocol analysis

What is the primary goal of tuning an IDPS?

To increase the number of false positives

To minimize false positives and false negatives (correct)

To maximize the number of true negatives

To reduce the number of true positives

What is a potential problem with signature-based detection?

It is not effective against unknown attacks Signup and view all the answers

What type of IDPS resides on a computer or appliance connected to a segment of an organization's network?

Network-based IDPS Signup and view all the answers

What type of detection method involves collecting statistical summaries of normal network traffic?

Anomaly-based detection Signup and view all the answers

Why might an HIDPS require additional disk capacity?

To retain host OS audit logs Signup and view all the answers

What is a true attack stimulus in the context of IDPS?

An event that triggers an alarm and causes an IDPS to react as if a real attack is in progress Signup and view all the answers

What type of attack is an HIDPS susceptible to?

Denial of Service (DoS) attacks Signup and view all the answers

What is site policy awareness in the context of IDPS?

An IDPS's ability to dynamically modify its configuration in response to environmental activity Signup and view all the answers

What is a limitation of a wireless NIDPS?

It cannot evaluate and diagnose issues with higher-layer protocols like TCP and UDP. Signup and view all the answers

What is the primary function of a network-based IDPS?

To monitor traffic on a specific segment of the network and identify attacks Signup and view all the answers

Where are sensors for wireless networks typically located?

On specialized sensor components or incorporated into selected mobile stations. Signup and view all the answers

What type of IDPS monitors activity only on a particular computer or server?

Host-based IDPS Signup and view all the answers

What is the purpose of site policy in the context of IDPS?

To provide guidelines for IDPS implementation and operation Signup and view all the answers

What is a capability of a wireless NIDPS?

Detecting unauthorized WLANs and WLAN devices. Signup and view all the answers

What is a host-based IDPS also known as?

System integrity verifiers Signup and view all the answers

What is a limitation of NIDPSs?

They require ongoing effort by the network administrator to evaluate logs of suspicious network activity. Signup and view all the answers

Study Notes

IDPS Detection Methods

IDPSs use signature-based detection, anomaly-based detection, and stateful protocol analysis to monitor and evaluate network traffic.

Signature-Based Detection

Examines network traffic for patterns that match known signatures or predetermined attack patterns.
Widely used because many attacks have clear and distinct signatures.
New attack patterns must be continually added to the IDPS's database of signatures to recognize new strategies.

Anomaly-Based Detection

Collects statistical summaries by observing traffic known to be normal.
Establishes a performance baseline over a period of time known as the training period.

IDPS Terminology

Site policy: rules and configuration guidelines governing IDPS implementation and operation within an organization.
Site policy awareness: an IDPS's ability to dynamically modify its configuration in response to environmental activity.
True attack stimulus: an event that triggers an alarm and causes an IDPS to react as if a real attack is in progress.
Tuning: adjusting an IDPS to maximize its efficiency in detecting true positives while minimizing false positives and false negatives.

Types of IDPS

Network-Based IDPS (NIDPS):
- Resides on a computer or appliance connected to a network segment.
- Monitors traffic on that segment, looking for indications of ongoing or successful attacks.
- Cannot reliably ascertain whether an attack was successful.

Wireless NIDPS

Monitors and analyzes wireless network traffic, looking for potential problems with wireless protocols (Layers 2 and 3 of the OSI model).
Cannot evaluate and diagnose issues with higher-layer protocols like TCP and UDP.
Can detect: unauthorized WLANs and WLAN devices, poorly secured WLAN devices, unusual usage patterns, wireless network scanners, DoS attacks and conditions, impersonation and man-in-the-middle attacks.

Host-Based IDPS (HIDPS)

Resides on a particular computer or server (the host) and monitors activity only on that system.
Known as system integrity verifiers because they benchmark and monitor the status of key system files and detect when an intruder creates, modifies, or deletes monitored files.
May require adding disk capacity to the system to retain host OS audit logs.
Not aware of attacks that span multiple devices in the network without complex correlation analysis.
Susceptible to some DoS attacks.

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Description

Understand the key concepts and policies related to Intrusion Detection and Prevention Systems (IDPS). Learn about site policy, dynamic IDPS, and true attack stimulus.