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NEW QUESTION: 1
Which of the following BEST describes the type of attack that is occurring? (Select TWO).







A. Replay
B. Xmas attack
C. DNS spoofing
D. Spear phishing
E. ARP attack
F. Backdoor
G. Man-in-the-middle
Answer: C,E
Explanation:
We have a legit bank web site and a hacker bank web site. The hacker has a laptop connected to the network. The hacker is redirecting bank web site users to the hacker bank web site instead of the legit bank web site. This can be done using two methods: DNS Spoofing and ARP Attack (ARP Poisoning).
A. DNS spoofing (or DNS cache poisoning) is a computer hacking attack, whereby data is introduced into a Domain
Name System (DNS) resolver's cache, causing the name server to return an incorrect IP address, diverting traffic to the attacker's computer (or any other computer).
A domain name system server translates a human-readable domain name (such as example.com) into a numerical IP address that is used to route communications between nodes. Normally if the server doesn't know a requested translation it will ask another server, and the process continues recursively. To increase performance, a server will typically remember (cache) these translations for a certain amount of time, so that, if it receives another request for the same translation, it can reply without having to ask the other server again.
When a DNS server has received a false translation and caches it for performance optimization, it is considered poisoned, and it supplies the false data to clients. If a DNS server is poisoned, it may return an incorrect IP address, diverting traffic to another computer (in this case, the hacker bank web site server).
E. Address Resolution Protocol poisoning (ARP poisoning) is a form of attack in which an attacker changes the Media
Access Control (MAC) address and attacks an Ethernet LAN by changing the target computer's ARP cache with a forged
ARP request and reply packets. This modifies the layer -Ethernet MAC address into the hacker's known MAC address to monitor it. Because the ARP replies are forged, the target computer unintentionally sends the frames to the hacker's computer first instead of sending it to the original destination. As a result, both the user's data and privacy are compromised. An effective ARP poisoning attempt is undetectable to the user.
ARP poisoning is also known as ARP cache poisoning or ARP poison routing (APR).
Incorrect Answers:
B. In cryptography and computer security, a man-in-the-middle attack (often abbreviated to MITM, MitM, MIM, MiM or MITMA) is an attack where the attacker secretly relays and possibly alters the communication between two parties w ho believe they are directly communicating with each other. One example is active eavesdropping, in which the attacker makes independent connections with the victims and relays messages between them to make them believe they are talking directly to each other over a private connection, when in fact the entire conversation is controlled by the attacker. The attacker must be able to intercept all relevant messages passing between the two victims and inject new ones. This is straightforward in many circumstances; for example, an attacker within reception range of an unencrypted Wi-Fi wireless access point, can insert himself as a man-in-the-middle. This is not the attack illustrated in this question.
C. A backdoor in a computer system (or cryptosystem or algorithm) is a method of bypassing normal authentication, securing unauthorized remote access to a computer, obtaining access to plaintext, and so on, while attempting to remain undetected. The backdoor may take the form of an installed program (e.g., Back Orifice) or may subvert the system through a rootkit.
A backdoor in a login system might take the form of a hard coded user and password combination which gives access to the system.
Although the number of backdoors in systems using proprietary software (software whose source code is not publicly available) is not widely credited, they are nevertheless frequently exposed. Programmers have even succeeded in secretly installing large amounts of benign code as Easter eggs in programs, although such cases may involve official forbearance, if not actual permission. This is not the attack illustrated in this question.
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. This is not the attack illustrated in this question.
F. Spear phishing is an e-mail spoofing fraud attempt that targets a specific organization, seeking unauthorized access to confidential data. As with the e-mail messages used in regular phishing expeditions, spear phishing messages appear to come from a trusted source. Phishing messages usually appear to come from a large and well-known company or Web site with a broad membership base, such as eBay or PayPal. In the case of spear phishing, however, the apparent source of the e-mail is likely to be an individual within the recipient's own company and generally someone in a position of authority. This is not the attack illustrated in this question.
G. In information technology, a Christmas tree packet is a packet with every single option set for whatever protocol is in use. The term derives from a fanciful image of each little option bit in a header being represented by a different- colored light bulb, all turned on, as in, "the packet was lit up like a Christmas tree." It can also be known as a kamikaze packet, nastygram or a lamp test segment.
Christmas tree packets can be used as a method of divining the underlying nature of a TCP/IP stack by sending the packets and awaiting and analyzing the responses. When used as part of scanning a system, the TCP header of a
Christmas tree packets has the flags SYN, FIN, URG and PSH set. Many operating systems implement their compliance w ith the Internet Protocol standard (RFC 791) in varying or incomplete ways. By observing how a host responds to an odd packet, such as a Christmas tree packet, assumptions can be made regarding the host's operating system.
Versions of Microsoft Windows, BSD/OS, HP-UX, Cisco IOS, MVS, and IRIX display behaviors that differ from the RFC standard when queried with said packets.
A large number of Christmas tree packets can also be used to conduct a DoS attack by exploiting the fact that
Christmas tree packets require much more processing by routers and end-hosts than the 'usual' packets do.
Christmas tree packets can be easily detected by intrusion-detection systems or more advanced firewalls. From a network security point of view, Christmas tree packets are always suspicious and indicate a high probability of network reconnaissance activities. This is not the attack illustrated in this question.
References:
http://en.wikipedia.org/wiki/DNS_spoofing
http://www.techopedia.com/definition/27471/address-resolution-protocol-poisoning-arp-poisoning
http://en.wikipedia.org/wiki/Man-in-the-middle_attack
http://en.wikipedia.org/wiki/Backdoor_%28computing%29
http://en.wikipedia.org/wiki/Replay_attack
http://searchsecurity.techtarget.com/definition/spear-phishing
http://en.wikipedia.org/wiki/Christmas_tree_packet

NEW QUESTION: 2
Is registration to a Gatekeeper or SIP Proxy required when using the Video IVR/Auto Attendant?
A. The Video IVR/Auto Attendant can be configured only with registration to a Gatekeeper.
B. The Video IVR/Auto Attendant can be configured only with registration to a SIP Proxy.
C. Yes, it is required.
D. No, it is not required.
Answer: C

NEW QUESTION: 3
What does an AP in Hybrid Spectrum mode do?
A. has all Aps in AP-group scan home channel and service clients.
B. Puts the selected band in spectrum mode and services clients on the other band.
C. makes the AP a spectrum monitor, but does not affect other Aps in the AP-group.
D. countries to serve clients as an AP while it scans and analyzes traffic
Answer: A