During a penetration test for a client that has a diverse infrastructure, the tester scans the network using Nmap and observes the following output: Which of the following would most likely be the…

The correct answer is C. IoT. Port 1883 is the default for MQTT, a lightweight publish/subscribe messaging protocol commonly used by IoT devices for telemetry and command/control, often alongside HTTP for management interfaces and SSH for administration.

Submitted by marco_it· Mar 6, 2026Reconnaissance and enumeration

Question

During a penetration test for a client that has a diverse infrastructure, the tester scans the network using Nmap and observes the following output:

Which of the following would most likely be the target device?

Options

ASwitch
BSCADA
CIoT
DRouter

How the community answered

(28 responses)

A
11% (3)
B
4% (1)
C
82% (23)
D
4% (1)

Explanation

Port 1883 is the default for MQTT, a lightweight publish/subscribe messaging protocol commonly used by IoT devices for telemetry and command/control, often alongside HTTP for management interfaces and SSH for administration.

Topics

#Nmap#device identification#IoT security#network scanning

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