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NEW QUESTION: 1
Which of the following is a reasonable response from the Intrusion Detection System (IDS) when it detects Internet Protocol (IP) packets where the IP source address and port is the same as the destination IP address and port?
A. Record selected information about the packets and drop the packets
B. Resolve the destination address and process the packet
C. Translate the source address and resend the packet
D. Allow the packet to be processed by the network and record the event
Answer: A
Explanation:
This question refers specificly to the LAND Attack. This question is testing your ability to recognize common attacks such as the Land Attack and also your understanding of what would be an acceptable action taken by your Intrusion Detection System.
You must remember what is a LAND ATTACK for the purpose of the exam. You must also remember that an IDS is not only a passive device. In the context of the exam it is considered an active device that is MOSTLY passive. It can take some blocking actions such as changing a rule on a router or firewall for example. In the case of the Land Attack and this specific question. It must be understand that most Operating System TCP/IP stack today would not be vulnerable to such attack. Many of the common firewall could also drop any traffic with same Source IP/Port as the Destination IP/Port as well. So there is multiple layers where such an attack could be stopped. The downfall of IDS compared with IPS is the fact they are usually reacting after the packets have been sent over the network. A single packet attack should as the Land Attack could be detected but would still complete and affect the destination target. This is where IPS could come into play and stop the attack before it completes.
Techtarget on their SearchSecurity website has the following definition for this type of attack: A land attack is a remote denial-of-service (DOS) attack caused by sending a packet to a machine with the source host/port the same as the destination host/port. This is a rather old attack and current patches should stop them for most systems. This is one of the attacks you are expected to know within the CBK. This question mention specifically what would the reaction of the IDS be? The choices presented and the question itself DOES NOT talk about IPS, WIDS, or other monitoring tools. It only mentions IDS. Restrict yourself to the context of the question.
MISCONCEPTIONS Many people have the misconception that an IDS can only record events and has no ability to take active response. This is NOT true. An IDS could reset a connection when an attack is detected. An IDS could change a rule on the firewall to block the attacker. An IDS could change a rule on a router to block offending traffic. IDS do have the ability to take active response and this is not reserved only for IPS. The second misconception is that within the ISC2 CBK an IDS is always a passive only system and does not take any blocking actions, this is not true. The IDS is a lot more limited than IPS as we are mentioning below but they do have the ability to block some of the attacks or traffic.
Here is a quote from the latest ISC2 on this subject: Intrusion detection and prevention systems are used to identify and respond to suspected security-related events in real-time or near-real-time. Intrusion Detection Systems (IDS) will use available information to determine if an attack is underway, send alerts, and provide limited response capabilities. Intrusion Prevention Systems (IPS) will use available information to determine if an attack is underway, send alerts but also block the attack from reaching its intended target.
SANS GIAC HAS A GREAT PAPER ON THIS TOPIC What does Limited response mean? It usually means active response in the context of IDS. There is a nice paper in the SANS library on this topic, you can find it at http://www.sans.org/securityresources/idfaq/active.php
See a small extract below: Active Response is a mechanism in intrusion detection systems (IDS) that provides the IDS with capability to respond to an attack when it has been detected. There are two methods that the IDS can take to circumvent an attack. The first method of circumventing attacks would be Session disruption, and the second is Filter rule manipulation. The specific feature varies with each IDS product and each countermeasure method possesses its own strengths and weaknesses. (See paper above for more details of these techniques) See reference below for more info if your into this type of stuff, else just keep it simple as described below.
Do not get too deep into this topic The discussion about what is an IDS and what is an IPS has been ongoing for the past decade at least. Just do a quick Google search of "IDS versus IPS" and you will see what I mean. Old timers like me will remember doing blocking with their IDS when such tool just came out. At that time the term IPS did not even exist. For the purpose of the exam, keep it simple. If the Instrusion Detection system is inline doing blocking of attacks it is an IPS. If the Instrusion Detection System only monitors traffic and activity without blocking it is an IDS. An IPS could be configure to act like an IDS where it will not block anything if the administrator of the device did not configure any blocking rules on the IPS. However, the opposite is not true, you cannot configure an IDS to act as an IPS, it does not have the smarts that an IPS would have.
IPS are usually deployed inline and IDS are not deployed inline.
The following answers are incorrect: Allow the packet to be processed by the network and record the event A spoofed packet is almost sure to be malicious and should be dropped. Note that some students may argue that an IDS itself does not drop the packets but it could terminate the connection by sending Reset (RST) packets to the sender pretending to the be target. The IDS could also change an ACL or Rule on the router or firewall to block the connections from the source IP.
Resolve the destination address and process the packet The 'correct' destination address could not be determined by the IDS Translate the source address and resend the packet The 'correct' source address could not be reliably determined by the IDS
The following reference(s) were/was used to create this question: Official (ISC)2 Guide to the CISSP CBK , Second Edition, Network Intrusion Detection, Page 129 and Corporate; (Isc)2 (2010-04-20). Official (ISC)2 Guide to the CISSP CBK , Second Edition ((ISC)2 Press) (Kindle Locations 12545-12548). Taylor & Francis. Kindle Edition. and Schneiter, Andrew (2013-04-15). Official (ISC)2 Guide to the CISSP CBK, Third Edition : Security Operations (Kindle Locations 704-707). . Kindle Edition. and http://searchsecurity.techtarget.com/answer/What-is-a-land-attack and http://www.symantec.com/connect/articles/understanding-ids-active-response-mechanisms and http://www.sans.org/security-resources/idfaq/active.php

NEW QUESTION: 2
When does a transaction complete? (Choose all that apply.)
A. When a data definition language statement is executed
B. When a TRUNCATE statement is executed after the pending transaction
C. When a ROLLBACK command is executed
D. When a PL/SQL anonymous block is executed
E. When a DELETE statement is executed
Answer: A,B,C
Explanation:
Explanation/Reference:

NEW QUESTION: 3
Your network contains an Active Directory domain named contoso.com.
The domain contains two DNS servers that run Windows Server 2016.
The servers host two zones named contoso.com and admin.contoso.com.
You sign both zones.
You need to ensure that all client computers in the domain validate the zone records when they query the zone.
What should you deploy?
A. a zone transfer policy
B. a Name Resolution Policy Table (NRPT)
C. a Microsoft Security Compliance Manager (SCM) policy
D. a connection security rule
Answer: B
Explanation:
Explanation
You should use Group Policy NRPT to for a DNS Client to perform DNSSEC validation of DNS zone records.

NEW QUESTION: 4
What are two common sources of interference for WI-FI networks? (Choose two.)
A. conventional oven
B. rogue AP
C. LED lights
D. fire alarm
E. radar
Answer: B,E