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A Guide On How To Define IDS

A Guide On How To Define IDS

An IDS often plays a core role in networking security. Even so, some people might wonder “How, exactly, do you define IDS?”. This article will answer that question.

How to define IDS

A basic way to define IDS is to say that it is a robust security mechanism designed to monitor and analyze network or system activities in real-time. Its key function is to alert if it detects anomalies that may indicate unauthorized access or malicious behavior.

When looking to define IDS and its role in security, it can be helpful to look at how it compares with both firewalls and IPS. These perform very similar roles. It’s therefore very easy to compare them with each other.

The main difference between IDS and both of these tools is that IDS is a passive system. It alerts administrators to potential rule breaches but it does not enforce rules. By contrast, both firewalls and IPS proactively enforce rules. For completeness, firewalls and IPS do essentially the same job but at different points in the network.

Types of IDS

Another way to define IDS is to look at the different types of IDS currently in use.

Hardware-based IDS: These are physical appliances that operate as standalone devices. They offer a high level of performance and reliability. This means they are ideal for enterprise-level security.

Software-based IDS: This is implemented through software applications. It integrates with existing hardware, providing flexibility and scalability. This means it is highly cost-effective, particularly for smaller organizations, allowing easier updates and customization.

Cloud-based IDS: This delivers and manages IDS security services through cloud platforms. It analyzes network traffic in the cloud, providing centralized security. This means it is scalable, offers real-time updates, and is well-suited to organizations with cloud-centric operations.

Network-based IDS: This monitors network traffic for suspicious patterns or activities. Its success depends on strategic placement at key network points like routers or switches. It provides a holistic view of network threats. This means it is well-suited to large-scale monitoring.

Host-based IDS: This is installed on individual devices (hosts) such as servers or endpoints. It offers tailored protection for individual devices. It is therefore considered essential for effective endpoint security.

Wireless IDS: This is specialized in monitoring wireless networks for unauthorized access or suspicious activities. It is considered essential for robust wireless security.

How IDS works

An IDS has four key components. These are sensors, analyzers, a decision engine, and response mechanisms. Here is an overview of each of these components and the role they play.


IDS uses strategically positioned sensors to capture and collect network traffic data. Network sensors focus on monitoring traffic at key junctures, identifying patterns and anomalies. Host sensors are installed on individual devices to provide localized protection.


These are also known as detection engines. Here is an overview of the key detection mechanisms employed by IDS

Signature-based detection: This method relies on a comprehensive database of predefined signatures or patterns associated with known cyber threats. As network traffic or system activity is observed, the IDS compares it against these signatures, enabling effective detection of recognized threats.

Anomaly-based detection: This method focuses on identifying deviations from established baselines or normal behavior within the network or system. By establishing patterns of expected behavior, the IDS can raise alerts when activities deviate from these norms, making it particularly adept at detecting previously unknown or zero-day attacks.

Heuristic-based detection: This method involves identifying patterns or behaviors that may indicate a potential threat based on general rules and algorithms. Unlike signature-based detection, heuristic approaches allow for the identification of novel attack patterns without relying on specific signatures, enhancing the system’s adaptability to emerging threats.

Behavioral-based detection: This method observes the typical behavior of users, systems, or networks. It triggers alerts when deviations from the norm are detected, providing an effective means of identifying subtle and persistent threats that may go unnoticed by other methods.

Network behavior analysis: This method takes a holistic approach, monitoring and analyzing patterns in network traffic to detect unusual or suspicious behavior that may indicate a security threat. This comprehensive view of network activities enhances the system’s ability to identify sophisticated and advanced threats.

Decision engine

The decision engine plays a pivotal role, and employs rule-based mechanisms and decision tables to assess the nature of detected activities. It generates alerts for suspicious behaviors, categorizing them based on severity and providing a structured approach to threat classification.

Response mechanisms

A key strength of IDS lies in its response mechanisms. Automated responses execute predefined actions to counter identified threats swiftly. Alert customization allows users to tailor responses to organizational needs. Furthermore, IDS integrates seamlessly with other security systems, such as firewalls and Security Information and Event Management (SIEM), ensuring a cohesive and coordinated defense strategy.


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