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Exam CISA topic 1 question 1519 discussion

Actual exam question from Isaca's CISA
Question #: 1519
Topic #: 1
[All CISA Questions]

In order for a firewall to effectively protect a network against external attacks, what fundamental practice must be followed?

  • A. Only essential external services should be permitted.
  • B. The firewall must be placed in the demilitarized zone (DMZ).
  • C. Filters for external information must be defined.
  • D. All external communication must be via the firewall.
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Suggested Answer: D 🗳️

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IFBBPROSALCEDO
1 month, 1 week ago
Selected Answer: A
Firewalls are designed to filter traffic by allowing or denying access to specific services or protocols. To ensure effective protection, only services that are absolutely necessary for business operations should be permitted through the firewall. This principle, often referred to as the principle of least privilege, minimizes the attack surface and reduces the risk of unauthorized access or exploitation.
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