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CISSP-ISSAP · Question #60

Which of the following heights of fence deters only casual trespassers?

The correct answer is B. 3 to 4 feet. A fence of 3 to 4 feet (B) is the standard height associated with deterring only casual trespassers - those who might wander in accidentally or opportunistically - because it signals a boundary without presenting a serious physical barrier. A 2 to 2.5 foot (C) fence is…

Infrastructure Security

Question

Which of the following heights of fence deters only casual trespassers?

Options

  • A8 feet
  • B3 to 4 feet
  • C2 to 2.5 feet
  • D6 to 7 feet

How the community answered

(28 responses)
  • A
    7% (2)
  • B
    89% (25)
  • D
    4% (1)

Explanation

A fence of 3 to 4 feet (B) is the standard height associated with deterring only casual trespassers - those who might wander in accidentally or opportunistically - because it signals a boundary without presenting a serious physical barrier. A 2 to 2.5 foot (C) fence is essentially decorative and deters no one meaningfully. A 6 to 7 foot (D) fence deters determined trespassers who are making a deliberate effort, while an 8 foot (A) fence is considered a high-security barrier that deters even highly motivated intruders and is typically topped with barbed wire or other deterrents.

Memory tip: Think in tiers - 2 ft = decoration, 3–4 ft = casual deterrence, 6–7 ft = determined deterrence, 8 ft = high security. You can remember "3–4 feet stops the careless, not the criminal."

Topics

#Physical perimeter security#Fence standards#Physical barriers#Access control

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