GCIH Question #275: Real Exam Question with Answer & Explanation

The correct answer is B: nc -z. The correct answer is B. The nc -z flag enables 'zero-I/O mode' in Netcat (nc), which causes it to connect to a target port without sending any data-making it ideal for port scanning to determine if a port is open or closed. The other options serve different purposes: -t enables

Question

Which of the following commands can be used for port scanning?

Options

Anc -t
Bnc -z
Cnc -w
Dnc -g

Explanation

The correct answer is B. The nc -z flag enables 'zero-I/O mode' in Netcat (nc), which causes it to connect to a target port without sending any data-making it ideal for port scanning to determine if a port is open or closed. The other options serve different purposes: -t enables Telnet protocol negotiation, -w sets a connection timeout value, and -g specifies source-routing hop points. When used with a range of ports (e.g., nc -z 192.168.1.1 1-1024), the -z flag efficiently scans multiple ports quickly.

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