B. 48101
Explanation:
Port 48101 is the default port used by Mirai, one of the most well-known IoT botnets. Mirai searches for IoT devices that have weak or default credentials, and once it gains access, it uses port 48101 to communicate with its command and control (C&C) server. By blocking port 48101, the infected device will not be able to communicate with the C&C server, and this can prevent the attacker from controlling the device or launching DDoS attacks.
B. 48101
CEH Book V12 Module 18 P 2896
How to Defend Against IoT Hacking :
Monitor traffic on port 48101, as infected devices attempt to spread the malicious file using port 48101.
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