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NEW QUESTION: 1
Four weeks ago, a network administrator applied a new IDS and allowed it to gather baseline dat a. As rumors of a layoff began to spread, the IDS alerted the network administrator that access to sensitive client files had risen far above normal. Which of the following kind of IDS is in use?
A. Protocol based
B. Heuristic based
C. Anomaly based
D. Signature based
Answer: C
Explanation:
Most intrusion detection systems (IDS) are what is known as signature-based. This means that they operate in much the same way as a virus scanner, by searching for a known identity - or signature - for each specific intrusion event.
And, while signature-based IDS is very efficient at sniffing out known methods of attack, it does, like anti-virus software, depend on receiving regular signature updates, to keep in touch with variations in hacker technique. In other words, signature-based IDS is only as good as its database of stored signatures.
Any organization wanting to implement a more thorough - and hence safer - solution, should consider what we call anomaly-based IDS. By its nature, anomaly-based IDS is a rather more complex creature. In network traffic terms, it captures all the headers of the IP packets running towards the network. From this, it filters out all known and legal traffic, including web traffic to the organization's web server, mail traffic to and from its mail server, outgoing web traffic from company employees and DNS traffic to and from its DNS server.
There are other equally obvious advantages to using anomaly-based IDS. For example, because it detects any traffic that is new or unusual, the anomaly method is particularly good at identifying sweeps and probes towards network hardware. It can, therefore, give early warnings of potential intrusions, because probes and scans are the predecessors of all attacks. And this applies equally to any new service installed on any item of hardware - for example, Telnet deployed on a network router for maintenance purposes and forgotten about when the maintenance was finished. This makes anomaly-based IDS perfect for detecting anything from port anomalies and web anomalies to mis-formed attacks, where the URL is deliberately mis-typed.
Incorrect Answers:
A. A protocol-based intrusion detection system (PIDS) is an intrusion detection system which is typically installed on a w eb server, and is used in the monitoring and analysis of the protocol in use by the computing system. A protocol- based intrusion detection system would not detect abnormal amounts access to sensitive client files. Therefore, this information is incorrect.
B. A heuristic-based signature uses an algorithm to determine whether an alarm should be fired. An example of this type of analysis and warning would be a signature that fires an alarm if a threshold number of unique ports are scanned on a particular host. The signature can also be limited to, say, SYN packets that are from a particular source, such as a perimeter router. Although heuristic-based signatures can be the only way to detect certain types of attacks, they require tuning and modification to better conform to their unique network environment. A heuristic -based intrusion detection system would not detect abnormal amounts access to sensitive client files. Therefore, this information is incorrect.
C. A signature-based system is primarily focused on evaluating attacks based on attack signatures and audit trails.
Signature-based IDS uses database of stored signatures and can only detect attacks based on the signatures in its database. A signature -based intrusion detection system would not detect abnormal amounts access to sensitive client files. Therefore, this information is incorrect.
References:
http://www.scmagazine.com/signature-based-or-anomaly-based-intrusion-detection-the-practice-and- pitfalls/article/30471/
http://www.pearsonitcertification.com/articles/article.aspx?p=174342
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, p. 109
NEW QUESTION: 2
MySQL. 1 server for user data, inventory, static data:
* - MySQL 5.8
- 8 core CPUs
- 128 GB of RAM
- 2x 5 TB HDD (RAID 1)
Redis 3 server cluster for metadata, social graph, caching. Each server is:
* - Redis 3.2
- 4 core CPUs
- 32GB of RAM
Compute:
40 Web Application servers providing micro-services based APIs and static content.
* - Tomcat - Java
- Nginx
- 4 core CPUs
- 32 GB of RAM
20 Apache Hadoop/Spark servers:
* - Data analysis
- Real-time trending calculations
- 8 core CPUS
- 128 GB of RAM
- 4x 5 TB HDD (RAID 1)
3 RabbitMQ servers for messaging, social notifications, and events:
* - 8 core CPUs
- 32GB of RAM
Miscellaneous servers:
* - Jenkins, monitoring, bastion hosts, security scanners
- 8 core CPUs
- 32GB of RAM
Storage appliances:
iSCSI for VM hosts
* Fiber channel SAN - MySQL databases
* - 1 PB total storage; 400 TB available
NAS - image storage, logs, backups
* - 100 TB total storage; 35 TB available
Business Requirements
Build a reliable and reproducible environment with scaled parity of production.
* Improve security by defining and adhering to a set of security and Identity and Access
* Management (IAM) best practices for cloud.
Improve business agility and speed of innovation through rapid provisioning of new resources.
* Analyze and optimize architecture for performance in the cloud.
* Technical Requirements
Easily create non-production environment in the cloud.
* Implement an automation framework for provisioning resources in cloud.
* Implement a continuous deployment process for deploying applications to the on-premises
* datacenter or cloud.
Support failover of the production environment to cloud during an emergency.
* Encrypt data on the wire and at rest.
* Support multiple private connections between the production data center and cloud
* environment.
A. Option A
B. Option B
C. Option D
D. Option C
Answer: D
NEW QUESTION: 3
A company is operating a multi-account environment under a single organization using AWS Organizations. The Security team discovers that some employees are using AWS services in ways that violate company policies. A SysOps Administrator needs to prevent all users of an account, including the root user, from performing certain restricted actions.
What should be done to accomplish this?
A. Define permissions boundaries to allow approved actions only
B. Apply service control policies (SCPs) to allow approved actions only
C. Apply service control policies (SCPs) to prevent restricted actions
D. Define permissions boundaries to prevent restricted actions
Answer: C
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