Two Most Common Implementations of Intrusion Detection Systems

D.

The two most common implementations of Intrusion Detection are Network-based and Host-based.

IDS can be implemented as a network device, such as a router, switch, firewall, or dedicated device monitoring traffic, typically referred to as network IDS (NIDS)

The" (IDS) "technology can also be incorporated into a host system (HIDS) to monitor a single system for undesirable activities.

" A network intrusion detection system (NIDS) is a network device ...

that monitors traffic traversing the network segment for which it is integrated." Remember that NIDS are usually passive in nature.

HIDS is the implementation of IDS capabilities at the host level.

Its most significant difference from NIDS is that related processes are limited to the boundaries of a single-host system.

However, this presents advantages in effectively detecting objectionable activities because the IDS process is running directly on the host system, not just observing it from the network.

Reference(s) used for this question: Hernandez CISSP, Steven (2012-12-21)

Official (ISC)2 Guide to the CISSP CBK, Third Edition ((ISC)2 Press) (Kindle Locations 3649-3652)

Auerbach Publications.

Kindle Edition.

The correct answer is D. Network-based and Host-based.

Intrusion Detection Systems (IDS) are designed to monitor and analyze network traffic, looking for signs of unauthorized access or other malicious activity. The two most common implementations of IDS are Network-based and Host-based.

1. Network-based IDS:

A network-based IDS (NIDS) is implemented at the network level and operates by analyzing network traffic to identify suspicious patterns or signatures. This type of IDS is installed on a separate device, such as a dedicated server or appliance, that is connected to a network segment and monitors all traffic that passes through it. NIDS examines the network packets in real-time and detects any anomalies or potential threats based on pre-defined rules or signatures. When a security event is detected, the NIDS can generate alerts and take appropriate actions to mitigate the threat.

2. Host-based IDS:

A host-based IDS (HIDS) operates at the individual host level, meaning it is installed on a specific server or endpoint device. HIDS analyzes the activity of the host system itself, such as system logs and file changes, to detect any signs of malicious activity. HIDS can monitor file access, registry changes, login attempts, system calls, and other activity to detect any unusual behavior. HIDS can also detect attacks that bypass the network-based IDS, such as those launched from within the organization's network.

In summary, both network-based IDS and host-based IDS are crucial components of a comprehensive intrusion detection strategy. Network-based IDS is best suited for monitoring network traffic and identifying external threats, while host-based IDS is more effective in detecting internal threats and attacks that originate from within the organization's network.