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312-50V11 · Question #216

Emil uses nmap to scan two hosts using this command: nmap -sS -T4 -O 192.168.99.1 192.168.99.7 He receives this output: What is his conclusion?

The correct answer is B. He performed a SYN scan and OS scan on hosts 192.168.99.1 and 192.168.99.7. The nmap command uses -sS for a TCP SYN scan and -O for OS fingerprinting against both listed hosts, making B the only conclusion directly supported by the command syntax.

Scanning Networks

Question

Emil uses nmap to scan two hosts using this command:

nmap -sS -T4 -O 192.168.99.1 192.168.99.7 He receives this output:

What is his conclusion?

Exhibit

312-50V11 question #216 exhibit

Options

  • AHost 192.168.99.7 is an iPad.
  • BHe performed a SYN scan and OS scan on hosts 192.168.99.1 and 192.168.99.7
  • CHost 192.168.99.1 is the host that he launched the scan from.
  • DHost 192.168.99.7 is down.

How the community answered

(41 responses)
  • A
    2% (1)
  • B
    85% (35)
  • C
    7% (3)
  • D
    5% (2)

Why each option

The nmap command uses -sS for a TCP SYN scan and -O for OS fingerprinting against both listed hosts, making B the only conclusion directly supported by the command syntax.

AHost 192.168.99.7 is an iPad.

OS fingerprinting estimates the operating system but cannot reliably identify a specific device model such as an iPad without additional context not shown in the command.

BHe performed a SYN scan and OS scan on hosts 192.168.99.1 and 192.168.99.7Correct

The -sS flag instructs nmap to perform a SYN (half-open) scan, and the -O flag enables OS detection via TCP/IP stack fingerprinting. The command explicitly targets both 192.168.99.1 and 192.168.99.7, so the factual conclusion is that a SYN scan and OS scan were run on both hosts.

CHost 192.168.99.1 is the host that he launched the scan from.

Nothing in the nmap command or its flags indicates that 192.168.99.1 is the scanning host; nmap scans any reachable address, including ones on the same subnet as the scanner.

DHost 192.168.99.7 is down.

If 192.168.99.7 were down, nmap would explicitly report the host as down; the question states output was received, implying the host responded.

Concept tested: nmap SYN scan and OS detection flags interpretation

Source: https://nmap.org/book/man-briefoptions.html

Topics

#nmap#SYN scan#OS fingerprinting#scan flags

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