Ann would like to perform a reliable scan against a remote target.

A TCP Connect scan, named after the Unix connect() system call is the most accurate scanning method. If a port is open the operating system completes the TCP three-way handshake, and the port scanner immediately closes the connection. Otherwise an error code is returned.

Example of a three-way handshake followed by a reset:

SourceDestinationSummary

[192.168.0.8][192.168.0.10]TCP: D=80 S=49389 SYN SEQ=3362197786 LEN=0 WIN=5840

[192.168.0.10] [192.168.0.8] TCP: D=49389 S=80 SYN ACK=3362197787 SEQ=58695210 LEN=0 WIN=65535

[192.168.0.8][192.168.0.10]TCP: D=80 S=49389 ACK=58695211 WIN<<2=5840

[192.168.0.8][192.168.0.10]TCP: D=80 S=49389 RST ACK=58695211 WIN<<2=5840