Certified Ethical Hacker (CEH v8) — Question 3

A penetration tester is conducting a port scan on a specific host. The tester found several ports opened that were confusing in concluding the Operating System
(OS) version installed. Considering the NMAP result below, which of the following is likely to be installed on the target machine by the OS?
Starting NMAP 5.21 at 2011-03-15 11:06
NMAP scan report for 172.16.40.65
Host is up (1.00s latency).

Not shown: 993 closed ports -

PORT STATE SERVICE -
21/tcp open ftp
23/tcp open telnet
80/tcp open http
139/tcp open netbios-ssn
515/tcp open
631/tcp open ipp
9100/tcp open

MAC Address: 00:00:48:0D:EE:89 -

Answer options

• A. The host is likely a Windows machine.
• B. The host is likely a Linux machine.
• C. The host is likely a router.
• D. The host is likely a printer.

Correct answer: D

Explanation

The presence of open ports such as 515 and 631, which are commonly associated with printing services, suggests that the device is likely a printer. The other options, while possible, do not align as closely with the specific ports that are typically open on a printer, making them less likely.