124 Chapter 5 ■ Scanning Networks
- What is missing from a half-open scan?
A. SYN
B. ACK
C. SY N-ACK
D. FIN - During an FIN scan, what indicates that a port is closed?
A. No return response
B. RST
C. ACK
D. SYN - During a Xmas scan what indicates a port is closed?
A. No return response
B. RST
C. ACK
D. SYN - What is the three-way handshake?
A. The opening sequence of a TCP connection
B. A type of half-open scan
C. A Xmas scan
D. Part of a UDP scan - A full-open scan means that the three-way handshake has been completed, what is the dif-
ference between this and a half-open scan?
A. A half-open uses TCP
B. A half-open uses UDP
C. A half-open removes the final ACK
D. A half-open includes the final ACK - What is the sequence of the three-way handshake?
A. SY N, SY N-ACK, ACK
B. SYN, SYN-ACK
C. SY N, ACK, SY N-ACK
D. SY N, ACK, ACK