16.
Which of the following types of attack has no flags set?
- A.SYN
- B.NULL
- C.Xmas tree
- D.FIN
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| A NULL scan has no flags configured on its packets. |
117.
What is missing from a half-open scan?
- A.SYN
- B.ACK
- C.SYN-ACK
- D.FIN
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| An ACK flag belongs to the last part of the three-way handshake, and this part never happens in a half-open scan. |
118.
During an FIN scan, what indicates that a port is closed?
- A.No return response
- B.RST
- C.ACK
- D.SYN
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| An RST indicates that the port is closed. |
119.
During a Xmas tree scan what indicates a port is closed?
- A.No return response
- B.RST
- C.ACK
- D.SYN
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| An RST indicates the port is closed in many of the TCP scan types. The RST is sent in response to a connection request and the RST indicates that the port is not available. |
120.
What is the three-way handshake?
- A.The opening sequence of a TCP connection
- B.A type of half-open scan
- C.A Xmas tree scan
- D.Part of a UDP scan
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The three-way handshake happens at the beginning of every TCP connection. |
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