Which statement about infrared-based wireless networks is presented in the material?

Which statement about infrared-based wireless networks is presented in the material?

• A. They are secure
• B. They are untraceable
• C. They require VPN
• D. They are immune to interference

Answer: (A)

Infrared-based wireless networks are described as secure because the infrared signal stays in a very confined, line-of-sight path and doesn’t travel far or through walls. This physical limitation means an attacker would need to be in the same room and aligned with the transmitter to observe or access the communication, making casual or remote eavesdropping much harder than with many radio frequency systems. The sense of security here comes from the fact that access effectively requires proximity and direct visibility, which reduces exposure to unauthorized listeners. The other statements don’t fit because: being untraceable isn’t guaranteed—someone in the same space with a detector could potentially observe the signal; requiring a VPN isn’t a property of the infrared link itself but a separate network-layer security measure; and infrared signals are not immune to interference—their performance can be degraded by bright light, sunlight, or other infrared sources.

Infrared-based wireless networks are described as secure because the infrared signal stays in a very confined, line-of-sight path and doesn’t travel far or through walls. This physical limitation means an attacker would need to be in the same room and aligned with the transmitter to observe or access the communication, making casual or remote eavesdropping much harder than with many radio frequency systems. The sense of security here comes from the fact that access effectively requires proximity and direct visibility, which reduces exposure to unauthorized listeners.

The other statements don’t fit because: being untraceable isn’t guaranteed—someone in the same space with a detector could potentially observe the signal; requiring a VPN isn’t a property of the infrared link itself but a separate network-layer security measure; and infrared signals are not immune to interference—their performance can be degraded by bright light, sunlight, or other infrared sources.