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NEW QUESTION: 1
Which of the following types of attacks involves interception of authentication traffic in an attempt to gain unauthorized access to a wireless network?
A. Replay attack
B. IV attack
C. Near field communication
D. Evil twin
Answer: B
Explanation:
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 w ho 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.
WEP (Wireless Equivalent Privacy) is vulnerable to an IV attack. Because RC4 is a stream cipher, the same traffic key must never be used twice. The purpose of an IV, which is transmitted as plain text, is to prevent any repetition, but a
24-bit IV is not long enough to ensure this on a busy network. The way the IV was used also opened WEP to a related key attack. For a 24-bit IV, there is a 50% probability the same IV will repeat after 5000 packets.
Incorrect Answers:
A. Near field communication (NFC) is a set of short-range wireless technologies, typically requiring a distance of 10 cm or less. NFC operates at 13.56 MHz on ISO/IEC 18000-3 air interface and at rates ranging from 106 kbit/s to 424 kbit/s.
NFC always involves an initiator and a target; the initiator actively generates an RF field that can power a passive target. This enables NFC targets to take very simple form factors such as tags, stickers, key fobs, or cards that do not require batteries. NFC peer-to-peer communication is possible, provided both devices are powered.
NFC tags contain data and are typically read-only, but may be rewriteable. They can be custom-encoded by their manufacturers or use the specifications provided by the NFC Forum, an industry association charged with promoting the technology and setting key standards. The tags can securely store personal data such as debit and credit card information, loyalty program data, PINs and networking contacts, among other information. The NFC Forum defines four types of tags that provide different communication speeds and capabilities in terms of configurability, memory, security, data retention and write endurance. Tags currently offer between 96 and 4,096 bytes of memory. NFC does not involve interception of authentication traffic in an attempt to gain unauthorized access to a wireless network. This is not what is described in the question.
C. An evil twin, in the context of network security, is a rogue or fake wireless access point (WAP) that appears as a genuine
HOTSPOT offered by a legitimate provider.
In an evil twin attack, an eavesdropper or hacker fraudulently creates this rogue
HOTSPOT to collect the personal data of unsuspecting users. Sensitive data can be stolen by spying on a connection or using a phishing technique.
For example, a hacker using an evil twin exploit may be positioned near an authentic Wi-Fi access point and discover the service set identifier (SSID) and frequency. The hacker may then send a radio signal using the exact same frequency and SSID. To end users, the rogue evil twin appears as their legitimate
HOTSPOT with the same name. Evil twin does not involve interception of authentication traffic in an attempt to gain unauthorized access to a wireless network.
D. A replay attack (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by IP packet substitution (such as stream cipher attack).
For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of identity, which
Alice dutifully provides (possibly after some transformation like a hash function); meanwhile, Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is over, Eve (posing as Alice) connects to
Bob; when asked for a proof of identity, Eve sends Alice's password (or hash) read from the last session, which Bob accepts thus granting access to Eve.
Replay attacks are used for impersonation rather than attempting to gain unauthorized access to a wireless network.
References:
http://www.techopedia.com/definition/26858/initialization-vector
http://en.wikipedia.org/wiki/Near_field_communication
http://www.techopedia.com/definition/5057/evil-twin
http://en.wikipedia.org/wiki/Replay_attack

NEW QUESTION: 2
Continuous Monitoring is the fourth phase of the security certification and accreditation process. What activities are performed in the Continuous Monitoring process Each correct answer represents a complete solution. Choose all that apply.
A. Security control monitoring and impact analyses of changes to the information system
B. Status reporting and documentation
C. Security accreditation documentation E. Security accreditation decision
D. Configuration management and control
Answer: A,B,D

NEW QUESTION: 3
데이터 센터와 VPC간에 동적 VPN을 구성했습니다. 라우터가 터널이 작동 중이고 BGP가 활성 상태라고 하지만 어떤 이유로 경로가 전파되는 것을 볼수 없습니다. 가장 큰 문제는 무엇입니까?
정답을 선택하십시오.
A. 새 BGP MD5 키를 얻어야 합니다.
B. 라우터가 BFD를 지원하지 않습니다.
C. 경로 테이블에서 경로 전파를 "예"로 설정하지 않았습니다.
D. BGP에 대한 방화벽을 구성해야 합니다.
Answer: C
Explanation:
You forgot to set route propagation to "yes" in the route table. If the route table says BGP is active and the tunnel is up, then you do not have a firewall issue. BFD has nothing to do with route propagation. You do not need a BGP MD5 key for VPN.

NEW QUESTION: 4
Which of the following provisions is (are) generally common to all buy-sell agreements?
1.Provisions specifying how the purchase price is to be funded.
2.Statement indicating the purpose of the agreement.
A. Neither 1 nor 2
B. 1 only
C. Both 1 and 2
D. 2 only
Answer: C

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