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Are you searching for a job? Want to become software engineer? Interested to work as a security officer? Do you have potential in updating latest technologies in software applications, then choose our site www.wisdomjobs.com which is best on line website with latest information about jobs and interviews. IDS (intrusion detection system) is a device or software application that monitors a network or systems for malicious activity or policy violations. It consists of software, hardware, or combination of two. It strives to be a leader in detailing and connection design by providing the highest quality of information quickly and effectively. Candidates who are willing to work as senior IDS analyst, senior IT executive, senior process design engineer, security analyst etc can avail the opportunity by seeing the IDS job interview questions and answers given below.
An intrusion detection system (IDS) is a device or software application that monitors a network or systems for malicious activity or policy violations. The most common classifications are network intrusion detection systems (NIDS) and host-based intrusion detection systems (HIDS).
If an IPS is a control tool, then an IDS is a visibility tool. Intrusion Detection Systems sit off to the side of the network, monitoring traffic at many different points, and provide visibility into the security posture of the network.
Intrusion detection functions include:
An intrusion detection system (IDS) inspects all inbound and outbound network activity and identifies suspicious patterns that may indicate a network or system attack from someone attempting to break into or compromise a system.
Host Based (HIDS) : Often referred to as HIDS, host based intrusion detection attempts to identify unauthorized, illicit, and anomalous behavior on a specific device. HIDS generally involves an agent installed on each system, monitoring and alerting on local OS and application activity. The installed agent uses a combination of signatures, rules, and heuristics to identify unauthorized activity. The role of a host IDS is passive, only gathering, identifying, logging, and alerting.
Examples of HIDS:
Physical (Physical IDS) : Physical intrusion detection is the act of identifying threats to physical systems. Physical intrusion detection is most often seen as physical controls put in place to ensure CIA. In many cases physical intrusion detection systems act as prevention systems as well.
Examples of Physical intrusion detections are:
Types of IDS :
Host Based IDS :
Network IDS (NIDS) :
Signature Based IDS : Compares incoming packets with known signatures.
E.g. Snort, Bro, Suricata, etc.
Anomaly Detection Systems : Learns the normal behavior of the system.Generates alerts on packets that are different from the normal behavior.
Signature based NIDS : Signature-based IDS refers to the detection of attacks by looking for specific patterns, such as byte sequences in network traffic, or known malicious instruction sequences used by malware. This terminology originates from anti-virus software, which refers to these detected patterns as signatures.
An anomaly-based intrusion detection system, is an intrusion detection system for detecting both network and computer intrusions and misuse by monitoring system activity and classifying it as either normal or anomalous. The classification is based on heuristics or rules, rather than patterns or signatures, and attempts to detect any type of misuse that falls out of normal system operation.
NIDS can perform the following functions to enhance the security :
Limitations of NIDS :
Attack Types :
Attacks detected by a NIDS:
Scanning Attack : In such attacks, an attacker sends various kinds of packets to probe a system or network for vulnerability that can be exploited.
Denial of Service (DoS) Attacks : A Denial of Service attack attempts to slow down or completely shut down a target so as to disrupt the service and deny the legitimate and authorized users an access. Such attacks are very common in the Internet where a collection of hosts are often used to bombard web servers with dummy requests . Such attacks can cause significant economic damage to ecommerce businesses by denying the customers an access to the business. There are a number of different kinds of DoS attacks, some of which are mentioned below.
Penetration Attacks : In penetration attack, an attacker gains an unauthorized control of a system, and can modify/alter system state, read files, etc. Generally such attacks exploit certain flaws in the software, which enables the attacker to install viruses, and malware in the system. The most common types of penetration attacks are:
A network intrusion is any unauthorized activity on a computer network. Detecting an intrusion depends on the defenders having a clear understanding of how attacks work.
An Intruder is a person who attempts to gain unauthorized access to a system, to damage that system, or to disturb data on that system. In summary, this person attempts to violate Security by interfering with system Availability, data Integrity or data Confidentiality.
Host intrusion detection systems (HIDS) and network intrusion detection systems (NIDS) are methods of security management for computers and networks.
A network-based intrusion detection system (NIDS) is used to monitor and analyze network traffic to protect a system from network-based threats. A NIDS reads all inbound packets and searches for any suspicious patterns.
A smartjack is a type of NID with capabilities beyond simple electrical connection, such as diagnostics. An optical network terminal (ONT) is a type of NID used with fiber-to-the-premises applications.
A firewall is a hardware and/or software which functions in a networked environment to block unauthorized access while permitting authorized communications. Firewall is a device and/or a sotware that stands between a local network and the Internet, and filters traffic that might be harmful.
An Intrusion Detection System (IDS) is a software or hardware device installed on the network (NIDS) or host (HIDS) to detect and report intrusion attempts to the network.
We can think a firewall as security personnel at the gate and an IDS device is a security camera after the gate. A firewall can block connection, while a Intrusion Detection System (IDS) cannot block connection. An Intrusion Detection System (IDS) alert any intrusion attempts to the security administrator.
However an Intrusion Detection and Prevention System (IDPS) can block connections if it finds the connections is an intrusion attempt.
Some leading Intrusion Detection Systems (IDS) Products are
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