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Intrusion Detection System - Essay Example

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Intrusion Detection System (IDS) checks the network and its activities. It identifies any different activity and informs the administrator. Working of the system in a network and the network traffic are monitored by the Intrusion Detection system. Systems that create traffic among the network are identified and blocked…
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Intrusion Detection System
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Intrusion Detection System

Download file to see previous pages... An IDS has the responsibility of analyzing the network and system configuration. In a network, integration of system is the major component. Intrusion Detection systems have to assess the integrity of the systems within a network.
Security threats may occur at anytime. Detection systems must be alert to identify and report the threats to the administrator. Several activities take place within a network. Any abnormal activity has to be analyzed by the detection system. A user will have certain limitations in accessing a network. A user policy is maintained by the organization. Each of the user's activity is recorded by the system. It tracks the user's activities and sends a report if the user violates the policy. Security threats and attacks can be in any form and can occur even in a highly secured network. Since the number of threats and attacks are increasing, an effective IDS is necessary. Network attacks are easier than intruding into a standalone system. As the systems are connected over the web, the task becomes easier. IDS is selected based on the network's complexity.(Base, Mall 2006). Most common attacks target on the system's confidentiality, system's control and the network's integrity. An IDS can identify various types of attacks. They monitor attacks like scanning, penetration attacks and denial of service.
The activities of the IDS are defined by the network administrator. Threats may arise from a system within the network or from any external source. (Bradley 2005).
Intrusion Detection systems are classified into two types. Network Based system and Host based intrusion detection systems are the widely used.
Network IDS (NIDS)
IDS that serve in a network are kept at specific places within a network. This will detect the problems in the network traffic. The traffic between the systems in that network is monitored. IDS used in a network must be efficient to handle heavy traffic inside a network. Inbound traffic and outbound traffic are monitored by the detection systems. (Cukic 2008).The traffic is analyzed from time to time. The flow of packets are regularly assessed and analyzed.
Host IDS (HIDS)
These systems are used in separate system in a network. It will alert any suspicious act within that system. Host based IDS analyze the packet flow and flow pertaining to that host system. HIDS has a limited control over the total network. It concentrates only on a particular host. It is difficult for these systems to handle the traffic of the entire network. Every system in a network must be installed with separate HIDS if they are not monitored by a NIDS.
Though these two are the common types of IDS, there are other types that can be used.
Signature Based IDS
This system makes use of predefined conditions to monitor the intrusions. It can easily handle previously documented attacks. A database is maintained to store the attack signatures. Every time an attack is identified, the signature is compared with the existing values in the database. It can identify the attacks that are already known. Database has to be updated regularly to be aware of the new attacks. (Cukic 2008).Failure to do so will lead to severe consequences. If a system is confronted with several attacks at the same time, the performance decreases. The system has to check with the database whenever an attack is ...Download file to see next pagesRead More
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