Intrusion Detection and Prevention

5 minutes 5 Questions

Intrusion Detection and Prevention Systems (IDPS) monitor, detect, and respond to potential security threats in networks and systems. These technologies analyze network traffic, events, and patterns to identify suspicious activities that may indicate an attack or breach. IDPS are classified into tw…

Guide & Exam Tips: Intrusion Detection and Prevention

Intrusion Detection and Prevention (IDP) is a vital aspect in the field of cybersecurity.

Importance:
The significance of IDP stems from its ability to identify potentially harmful activities within a network and prevent them before they can cause damage. Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) play a crucial role in safeguarding sensitive information from unauthorized access and breaches.

What it is:
IDP refers to the techniques and tools used in identifying and mitigating threats to a network. IDS is responsible for monitoring network or system activities for malicious actions, while the IPS system can block or prevent identified threats.

How it works:
The IDS works by continually monitoring network traffic and comparing it with predefined or learned patterns of harmful activities. Once a likely intrusion is detected, notifications are being sent to the system administrators. Whereas, an IPS system includes the same functionalities as IDS and also has the ability to take immediate action upon detecting a threat, which can include blocking network traffic or terminating certain processes.

Exam Tips: Answering Questions on Intrusion Detection and Prevention:
1. Understand the difference between IDS and IPS.
2. Know about common types of intrusion detection methods such as signature-based, anomaly-based, and behavior-based detection.
3. Be familiar with the various deployment models of IDS/IPS like Network-based, Host-based, and Wireless.
4. Remember that IDS detects potential threats and notifies, while IPS takes action to prevent them.
5. Understand how false positives and negatives are interpreted and managed in IDP systems.
6. Stay updated with recent developments and examples in the IDP landscape.

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Question 1

A web application accepts user input which is not properly sanitized or validated. As a result, an attacker can execute malicious commands using the user input. Which IDPS will be the most effective in detecting and mitigating such attack?

Network-based IDS Signature-based IDS Web Application Firewall Host-based IDS

Correct Answer: Web Application Firewall

A Web Application Firewall (WAF) inspects incoming traffic and can detect and block specific attacks targeting web applications, like SQL injections and Cross-site Scripting attacks, when it discovers malicious user input.

Question 2

When monitoring a network, an administrator discovers connections to a known command-and-control server. Which type of IDPS technology would help validate this finding?

Host-based IDS Anomaly-based IDS Signature-based IDS Network-based IDS

Correct Answer: Signature-based IDS

Signature-based IDS examines network traffic for specific patterns associated with known malicious activity, such as connections to command-and-control servers. This would validate if the connections are indeed malicious or not.

Question 3

A company has implemented a HIDS on their servers to detect unusual activity. One of the servers suddenly has a surge in CPU usage, and the HIDS alerts the administrator. What could be causing this?

A malware infection. A DDoS attack. Scheduled updates. A hardware failure.

Correct Answer: A malware infection.

A HIDS detects unusual activity such as high CPU usage, which can indicate a malware infection. Other options may cause a surge in usage, but don't align with HIDS functionality.

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