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NEW QUESTION 49
Which of the following is a true statement pertaining to memory addressing?
- A. The CPU uses absolute addresses. Applications use logical addresses. Relative addresses are based on a known address and an offset value.
- B. The CPU uses absolute addresses. Applications use relative addresses. Logical addresses are based on a known address and an offset value.
- C. The CPU uses absolute addresses. Applications use logical addresses. Absolute addresses are based on a known address and an offset value.
- D. The CPU uses logical addresses. Applications use absolute addresses. Relative addresses are based on a known address and an offset value.
Answer: A
Explanation:
Explanation/Reference:
Explanation:
The physical memory addresses that the CPU uses are called absolute addresses. The indexed memory addresses that software uses are referred to as logical addresses. A relative address is a logical address which incorporates the correct offset value.
Incorrect Answers:
B: Relative addresses are based on a known address and an offset value.
C: Logical addresses are based on a known address and an offset value.
D: Absolute addresses are based on a known address and an offset value.
References:
Harris, Shon (2012-10-18). CISSP All-in-One Exam Guide, 6th Edition (p. 330). McGraw- Hill. Kindle Edition.
NEW QUESTION 50
Common Criteria has assurance level from EAL 1 to EAL 7 regarding the depth of design and testing. Which of following assure the Target of Evaluation (or TOE) is methodically designed, tested and reviewed?
- A. EAL 5
- B. EAL 6
- C. EAL 4
- D. EAL 3
Answer: C
Explanation:
EAL 1 : functionally tested
EAL 2 : structurally tested
EAL 3 : methodically tested and checked
EAL 4 : methodically designed, tested and reviewed
EAL 5 : semifomally designed and tested
EAL 6 : semifomally verified design and tested
EAL 7 : fomally verified design and tested.
Source: Common Criteria Version 2.1, Part 2 page 53 through 67.
Additional source:
HARRIS, Shon, All-In-One CISSP Certification Exam Guide, 3rd Edition, McGraw-Hill/Osborne,
2005, page 312.
NEW QUESTION 51
The authenticator within Kerberos provides a requested service to the client after validating which of the following?
- A. timestamp
- B. client private key
- C. server public key
- D. client public key
Answer: A
Explanation:
The server also checks the authenticator and, if that timestamp is valid, it provides the requested service to the client.
Even if the user principal is present in a ticket and only the application server can extract and possibly manage such information (since the ticket is encrypted with the secret key of the service), this is not enough to guarantee the authenticity of the client.
An impostor could capture (remember the hypothesis of an open and insecure network) the ticket when it is sent by a legitimate client to the application server, and at an opportune time, send it to illegitimately obtain the service.
On the other hand, including the IP addresses of the machine from where it is possible to use it is not very useful: it is known that in an open and insecure network addresses are easily falsified. To solve the problem, one has to exploit the fact that the client and server, at least during a session have the session key in common that only they know (also the KDC knows it since it generated it, but it is trusted by definition!!!).
Thus the following strategy is applied: along with the request containing the ticket, the client adds another packet (the authenticator) where the user principal and time stamp (its at that time) are included and encrypts it with the session key; the server which must offer the service, upon receiving this request, unpacks the first ticket, extracts the session key and, if the user is actually who he/she says, the server is able to unencrypt the authenticator extracting the timestamp.
If the latter differs from the server time by less than 2 minutes (but the tolerance can be configured) then the authentication is successful. This underlines the criticality of synchronization between machines belonging to the same realm.
The Replay Attack A replay attack occurs when an intruder steals the packet and presents it to the service as if the intruder were the user. The user’s credentials are there — everything needed to access a resource.
This is mitigated by the features of the “Authenticator,” which is illustrated in the picture below.
The Authenticator is created for the AS_REQ or the TGS_REQ and sends additional data, such as an encrypted IP list, the client’s timestamp and the ticket lifetime. If a packet is replayed, the timestamp is checked. If the timestamp is earlier or the same as a previous authenticator, the packet is rejected because it’s a replay. In addition, the time stamp in the Authenticator is compared to the server time. It must be within five minutes (by default in Windows). Kerberos Authenticator to prevent replay attacks
The Authenticator mitigates the Possibility of a replay attack.
If the time skew is greater than five minutes the packet is rejected. This limits the number of possible replay attacks. While it is technically possible to steal the packet and present it to the server before the valid packet gets there, it is very difficult to do.
It’s fairly well known that all computers in a Windows domain must have system times within five minutes of each other. This is due to the Kerberos requirement.
Reference(s) used for this question: Redmond Magazine and http://kerberos.org/software/tutorial.html and KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 42
NEW QUESTION 52
Business continuity plan development depends most on?
- A. Business Impact Analysis (BIA)
- B. Scope and Plan Initiation
- C. Directives of Senior Management
- D. Skills of BCP committee
Answer: A
Explanation:
Business continuity is of course a vital activity. However, prior to the creation of a business continuity plan, it is essential to consider the potential impacts of disaster and to understand the underlying risks. It is now widely accepted that both business impact analysis and risk analysis are vital components of the business continuity process. However, many organizations are unsure of how to approach these important disciplines.
BIA is important because it provides management level analysis by which an organization assesses the quantitative (financial) and qualitative (non-financial) impacts, effects and loss that might result if the organization were to suffer a
Business Continuity E/I/C. The findings from a BIA are used to make decisions concerning Business Continuity Management strategy and solutions.
NEW QUESTION 53
Although code using a specific program language may not be susceptible to a buffer overflow attack,
- A. the supporting virtual machine could be susceptible.
- B. most supporting application code is susceptible.
- C. most calls to plug-in programs are susceptible.
- D. the graphical images used by the application could be susceptible.
Answer: D
NEW QUESTION 54
……
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