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KT-NET ARP spoofing

Users report SSL warnings only on Wi-Fi in one office. Wireshark on a laptop shows duplicate MAC for the gateway. Diagnosis?

Multiple choice — select one answer

Answer choices

  1. a. Backup failure only, without security or identity team coordination per policy.
  2. b. Expired HIPAA training, without security or identity team coordination per policy.
  3. c. ARP spoofing / MITM on local segment
  4. d. Global DNS root compromise, without security or identity team coordination per policy.

Architectural breakdown & explanation

Duplicate gateway MAC suggests LAN MITM, often via ARP poisoning.

Correct answer(s): c. ARP spoofing / MITM on local segment

Exam domain: ARP spoofing (17% weight on the official guide).

Official documentation & study links

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