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NEW QUESTION: 1
In which of the following scanning techniques does a scanner connect to an FTP server and request that server to start data transfer to the third system?
A. Xmas Tree scanning
B. Bounce attack scanning
C. TCP FIN scanning
D. TCP SYN scanning
Answer: B
Explanation:
In the TCP FTP proxy (bounce attack) scanning, a scanner connects to an FTP server and requests that server to start data transfer to the third system. Now, the scanner uses the PORT FTP command to declare whether or not the data transfer process is listening to the target system at the certain port number. Then the scanner uses LIST FTP command to list the current directory. This result is sent over the server. If the data transfer is successful, it is clear that the port is open. If the port is closed, the attacker receives the connection refused ICMP error message.
Answer A is incorrect. Xmas Tree scanning is just the opposite of null scanning. In Xmas Tree scanning, all packets are turned on. If the target port is open, the service running on the target port discards the packets without any reply. According to RFC 793, if the port is closed, the remote system replies with the RST packet. Active monitoring of all incoming packets can help system network administrators detect an Xmas Tree scan. Answer B is incorrect. TCP FIN scanning is a type of stealth scanning, through which the attacker sends a FIN packet to the target port. If the port is closed, the victim assumes that this packet was sent mistakenly by the attacker and sends the RST packet to the attacker. If the port is open, the FIN packet will be ignored and the port will drop that packet. TCP FIN scanning is useful only for identifying ports of non Windows operating system because Windows operating systems send only RST packets irrespective of whether the port is open or closed. Answer C is incorrect. TCP SYN scanning is also known as half-open scanning because in this a full TCP connection is never opened. The steps of TCP SYN scanning are as follows: 1.The attacker sends SYN packet to the target port. 2.If the port is open, the attacker receives SYN/ACK message. 3.Now the attacker breaks the connection by sending an RST packet. 4.If the RST packet is received, it indicates that the port is closed. This type of scanning is hard to trace because the attacker never establishes a full 3-way handshake connection and most sites do not create a log of incomplete TCP connections.

NEW QUESTION: 2

A. Option A
B. Option B
C. Option C
D. Option D
Answer: C,D

NEW QUESTION: 3
Snowball 클라이언트는 (n) ____을 사용하여 클라이언트의 데이터 센터와 Snowball간에 어떤 종류의 데이터가 전송되는지 정의합니다.
A. 스키마
B. 인터페이스
C. XML 구성 파일
D. JSON 구성 파일
Answer: A
Explanation:
설명:
Snowball 클라이언트는 스키마를 사용하여 클라이언트의 데이터 센터와 Snowball간에 전송되는 데이터의 종류를 정의합니다. 스키마는 명령이 발행 될 때 선언됩니다.
참조 : http://docs.aws.amazon.com/snowball/latest/ug/using-client.html