Which of the following is true of network security?
Correct Answer: B
Commercial firewalls are a dime-a-dozen in todays world. Black firewall and whitewall are just distracters.
Question 182
In the days before CIDR (Classless Internet Domain Routing), networks were commonly organized by classes. Which of the following would have been true of a Class B network?
Correct Answer: B
Question 183
This backup method makes a complete backup of every file on the server every time it is run by:
Correct Answer: A
Question 184
Which of the following would be defined as an absence of safeguard that could be exploited?
Correct Answer: B
In IT, a vulnerability is the weakness of a System to be exploited and corrupted by a security hole. There is always a risk that our systems been vulnerable, with security we cannot make the risk to be 0%, but we can decrease the possibility of a threat becoming in a successful attack through one of those vulnerabilities. There is no system without vulnerabilities, we need to patch our systems frequently to reduce the risk of a threat through a vulnerability of one of our systems.
Question 185
Which of the following can be defined as an attribute in one relation that has values matching the primary key in another relation?
Correct Answer: A
Explanation/Reference: Explanation: A foreign key is an attribute in one table that matches the primary key of another table and is used to cross-reference tables. Incorrect Answers: B: Candidate keys are a subset of attributes that from which the database developer can choose the primary key to uniquely identify any tuple or record in a table. C: The primary key is the attribute that is used to make each row or tuple in a table unique. D: Secondary keys are candidate keys that have not been chosen as the primary key. The primary key is the attribute that is used to make each row or tuple in a table unique. Candidate keys are a subset of attributes that from which the database developer can choose the primary key. References: Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, pp. 1174, 1179- 1180 Stewart, James, Ed Tittel and Mike Chapple, CISSP: Certified Information Systems security Professional Study Guide, 5th Edition, Wiley Publishing, Indianapolis, 2011, pp. 276, 312 http://databases.about.com/cs/specificproducts/g/candidate.htm http://rdbms.opengrass.net/2_Database Design/2.1_TermsOfReference/2.1.2_Keys.html
