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Download DemoVendor: CompTIA
Certifications: CompTIA Security+
Exam Code: JK0-022
Exam Name: CompTIA Security+ Certification
Updated: Mar 11, 2024
Q&As: 1149
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Which of the following provides the HIGHEST level of confidentiality on a wireless network?
A. Disabling SSID broadcast
B. MAC filtering
C. WPA2
D. Packet switching
Correct Answer: C
The Wi-Fi Protected Access (WPA) and Wi-Fi Protected Access 2 (WPA2) authentication protocols were designed to address the core, easy-to-crack problems of WEP. Incorrect Answers:
A: Disabling SSID broadcasting is not the best solution. One method of protecting the network that is often recommended is to disable, or turn off, the SSID broadcast (also known as cloaking). The access point is still there, and it is still accessible by those who have been told of its existence by the administrator, but it prevents those who are just scanning from finding it. This is considered a very weak form of security, because there are still other ways, albeit a bit more complicated, to discover the presence of the access point besides the SSID broadcast.
B: MAC filtering would increase the security, but an authentication protocol such as WPA2 would still be required. Note: When MAC filtering is used, the administrator compiles a list of the MAC addresses associated with users' computers and enters those addresses. When a client attempts to connect and other values have been correctly entered, an additional check of the MAC address is done. If the address appears in the list, the client is allowed to join; otherwise, it is forbidden from doing so.
D: Packet switching is a method of transferring data on an Ethernet network. Packet switching does not address wireless security.
References:
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, Sixth Edition, Sybex, Indianapolis, 2014, pp 171, 178, 183, 258
After a user performed a war driving attack, the network administrator noticed several similar markings where WiFi was available throughout the enterprise. Which of the following is the term used to describe these markings?
A. IV attack
B. War dialing
C. Rogue access points
D. War chalking
Correct Answer: D
War chalking is the act of making chalk marks on outdoor surfaces (walls, sidewalks, buildings, sign posts, trees) to indicate the existence of an open wireless network connection, usually offering an Internet connection so that others can benefit from the free wireless access. The open connections typically come from the access points of wireless networks located within buildings to serve enterprises. The chalk symbols indicate the type of access point that is available at that specific spot.
Incorrect Answers:
A: An initialization vector is a random number used in combination with a secret key as a means to encrypt data. This number is sometimes referred to as a nonce, or "number occurring once," as an encryption program uses it only once per
session.
An initialization vector is used to avoid repetition during the data encryption process, making it impossible for hackers who use dictionary attack to decrypt the exchanged encrypted message by discovering a pattern. This is known as an IV
attack.
A particular binary sequence may be repeated more than once in a message, and the more it appears, the more the encryption method is discoverable. For example if a one-letter word exists in a message, it may be either "a" or "I" but it can't
be "e" because the word "e" is non-sensical in English, while "a" has a meaning and "I" has a meaning. Repeating the words and letters makes it possible for software to apply a dictionary and discover the binary sequence corresponding to
each letter.
Using an initialization vector changes the binary sequence corresponding to each letter, enabling the letter "a" to be represented by a particular sequence in the first instance, and then represented by a completely different binary sequence in
the second instance. An IV attack does not involve marking external surfaces to indicate open Wifi networks.
Therefore, this answer is incorrect.
B: War dialing is a technique of using a modem to automatically scan a list of telephone numbers, usually dialing every number in a local area code to search for computers, Bulletin board systems and fax machines. Hackers use the resulting
lists for various purposes: hobbyists for exploration, and crackers - malicious hackers who specialize in computer security - for guessing user accounts (by capturing voicemail greetings), or locating modems that might provide an entry-point
into computer or other electronic systems. It may also be used by security personnel, for example, to detect unauthorized devices, such as modems or faxes, on a company's telephone network. War dialing does not involve marking external
surfaces to indicate open Wifi networks. Therefore, this answer is incorrect.
C: A rogue access point is a wireless access point that has either been installed on a secure company network without explicit authorization from a local network administrator, or has been created to allow a hacker to conduct a man-in-themiddle attack. Rogue access points of the first kind can pose a security threat to large organizations with many employees, because anyone with access to the premises can install (maliciously or non-maliciously) an inexpensive wireless
router that can potentially allow access to a secure network to unauthorized parties. Rogue access points of the second kind target networks that do not employ mutual authentication (client-server server-client) and may be used in
conjunction with a rogue RADIUS server, depending on security configuration of the target network.
This is not what is described in the question.
Therefore, this answer is incorrect.
References: http://www.webopedia.com/TERM/W/warchalking.html http://www.techopedia.com/definition/26858/initialization-vector http://en.wikipedia.org/wiki/War_dialing http://en.wikipedia.org/wiki/Rogue_access_point
Which of the following is a common coding error in which boundary checking is not performed?
A. Input validation
B. Fuzzing
C. Secure coding
D. Cross-site scripting
Correct Answer: A
Input validation is a defensive technique intended to mitigate against possible user input attacks, such as buffer overflows and fuzzing. Input validation checks every user input submitted to the application before processing that input. The check could be a length, a character type, a language type, or a domain.
Incorrect Answers:
B: Fuzzing is a software testing technique that involves providing invalid, unexpected, or random data to as inputs to a computer program. The program is then monitored for exceptions such as crashes, or failed validation, or memory leaks.
C: Proper and secure coding can prevent many attacks, including cross-site scripting, SQL injection and buffer overflows.
D: Cross-site scripting (XSS) is a form of malicious code-injection attack on a web server in which an attacker injects code into the content sent to website visitors. XSS can be mitigated by implementing patch management on the web server, using firewalls, and auditing for suspicious activity
References: http://en.wikipedia.org/wiki/Fuzz_testing Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, Sixth Edition, Sybex, Indianapolis, 2014, pp 218, 257 Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp 192, 229, 319
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