linear algebra question pls helpa) What conditions must the entries of b satisfy in order for Ax = b to have a solution?b) What is the nullspace of R? (Write it in terms of a basis.)c) Assuming that the conditions in (a) are satisfied, what is a particular solution xpAx = b? (You can set the free variables to anything when finding xp; but please set themto zero here.)d) What is the full solution to Ax = b?There are two good ways

• Attachment 1
• Attachment 2
• Attachment 3
• Attachment 4

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

This document of INF 325 Week 4 Security plan contains:

Security PlanWhy is security primarily a management issue, not a technological issue? Also, provide some specific bulleted points on what you would include in a security plan if you were the Information Technology Director of a small firm.

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

INFA 610

Foundations of Information Security and Assurance

Quiz 2

TRUE/FALSE QUESTIONS:

There is a problem anticipating and testing for all potential types of non-standard inputs that might be exploited by an attacker to subvert a program.

2. Without suitable synchronization of accesses it is possible that values may be corrupted, or changes lost, due to over-lapping access, use, and replacement of shared values.

3. The biggest change of the nature in Windows XP SP2 was to change all anonymous remote procedure call (RPC) access to require authentication.

4. The Zotob worm, which took advantage of a vulnerability in Microsoft Plug and Play (PnP) and which was accessible through RPC, did not affect Windows XP SP2, even the coding bug was there.

5. Key issues from a software security perspective are whether the implemented algorithm correctly solves the specified problem, whether the machine instructions executed correctly represent the high level algorithm specification, and whether the manipulation of data values in variables is valid and meaningful.

6. C’s designers placed much more emphasis on space efficiency and performance considerations than on type safety.

7. An effective method for protecting programs against classic stack overflow attacks is to instrument the function entry and exit code to setup and then check its stack frame for any evidence of corruption.

8. From the attacker’s perspective, the challenge in cracking a Linux system therefore boils down to gaining root privileges.

9. AppArmor is built on the assumption that the single biggest attack vector on most systems is application vulnerabilities. If the application’s behavior is restricted, then the behavior of any attacker who succeeds in exploiting some vulnerability in that application will also be restricted.

10. A very common configuration fault seen with Web and file transfer servers is for all the files supplied by the service to be owned by the same “user” account that the server executes as.

11. Programmers use trapdoors legitimately to debug and test programs.

12. If the compromised machine uses encrypted communication channels, then just sniffing the network packets on the victim’s computer is useless because the appropriate key to decrypt the packets is missing.

13. Packet sniffers are seldom used to retrieve sensitive information like usernames and passwords.

14. Buffer overflows can be found in a wide variety of programs.

15. EFS allows files and directories to be encrypted and decrypted transparently for authorized users. All versions of Windows since Windows 2000 support Encryption File System.

16. A bot propagates itself and activates itself, whereas a worm is initially controlled from some central facility.

17. The correct implementation in the case of an atomic operation is to test separately for the presence of the lockfile and to not always attempt to create it.

18. Kernel space is swapped to hard disk in order to obtain quick access.

19. Performing regular backups of data on a system is a critical control that assists with maintaining the integrity of the system and user data.

20. Backup and archive processes are often linked and managed separately.

MULTIPLE CHOICE QUESTIONS:

1. ______ systems should not run automatic updates because they may possibly introduce instability.

A. Change controlled

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

Question 1Select one answer. 10 pointsAt the beginning of the semester, students who registered for a statistics course were randomly assigned to two sections, each taught by a different instructor. At the end of the semester, we would like to test whether there are differences in performance on the final exam between the two sections.matched pairs t-testtwo-sample t-testANOVAchi-squared test for independenceinference for regressionQuestion 2Select one answer. 10 pointsAdvertising researchers claim that the power of curiosity can be harnessed to design an effective Internet advertising strategy that results in a better evaluation of the advertised product. They develop six advertising texts with varying amounts of “curiosity” triggers. College students are randomly assigned to one of the six versions of the advertisement text and their evaluation score of the advertised product is recorded. matched pairs t-testtwo-sample t-testANOVAchi-squared test for independenceinference for regressionQuestion 3Select one answer. 10 pointsA physical therapy researcher was interested in determining the impact of two different exercises. The investigator suspected that the two exercises produced a different level of activity in the muscle. Each of 16 subjects performed both exercise 1 and exercise 2, and the results are shown (for each subject, the order of the exercises was randomly assigned and sufficient rest time was provided between the two exercises). matched pairs t-testtwo-sample t-testANOVAchi-squared test for independenceinference for regressionQuestion 4Select one answer. 10 pointsWe select random samples from several racial categories (Caucasian, African-American, Hispanic, Asian-American) to determine if there is a difference in overall mean earnings among the groups.matched pairs t-testtwo-sample t-testANOVAchi-squared test for independenceinference for regressionQuestion 5Select one answer. 10 pointsWe want to test for a relationship between race and marital status (married/never married/divorced/widowed).matched pairs t-testtwo-sample t-testANOVAchi-squared test for independenceinference for regressionThe next three questions refer to the following information:A researcher wants to explore the relationship between the following two variables, Weight 1 and Weight 2.For each question below, choose the most appropriate inference method to analyze these data, under the given scenarios.Question 6Select one answer. 10 pointsSuppose that Weight 1 is the weight (in pounds) of a sample of five individuals before beginning a weight-loss diet, and Weight 2 is the weight in (pounds) of the same five individuals after the diet. If we would like to test the effectiveness of the diet, which of the following is the appropriate inference method?matched pairstwo independent samplesinference for regressionQuestion 7Select one answer. 10 pointsIn preparing for a balsa wood bridge challenge, students weighed (in g) a random sample of five balsa wood designs and recorded these data as Weight 1. They also recorded the maximum weight (in kg) that the bridge could support. If the students want to know if there is an association between the weight of the bridge (in g) and the maximum weight supported (in kg), which of the following is the appropriate inference method?matched pairstwo independent samplesinference for regressionQuestion 8Select one answer. 10 pointsIf Weight 1 is the weight (in pounds) of a random sample of five men who were accepted as models, and Weight 2 is the weight (in pounds) of a random sample of five men who were rejected as models, which of the following is the appropriate inference method?matched pairstwo independent samplesinference for regression

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"

Inferior Company, which is based on South Carolina, makes and sells products that are poorly made. Jack, who is a resident of North Carolina, buys an Inferior product and suffers an injury through its use. The diversity of citizenship between these parties means thatAnswer :a-federal and state courts have concurrent jurisdiction.d-federal courts have exclusive jurisdiction.c-no court has jurisdiction.d-state courts have exclusive jurisdiction.

Inferior Company, which is based on South Carolina, makes and sells productsthat are poorly made. Jack, who is a resident of North Carolina, buys an Inferiorproduct and suffers an injury through…

 

"Looking for a Similar Assignment? Get Expert Help at an Amazing Discount!"