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Suspicious application commands often originate from DoS attacks, malware and:

ABuffer overhangs
BBuffer overlaps
CBuffer overflows
DBuffer overloads
Answer & Solution
Correct answer: C. Buffer overflows
1. Several attack families reach the application protocol. 2. One of them abuses memory handling in the target. 3. Suspicious commands often originate from buffer overflow attacks, DoS attacks and malware. 4. So the answer is buffer overflows. _Source: NIST SP 800-41 Rev. 1, 'Guidelines on Firewalls and Firewall Policy'_
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