CompTIA Network+ Practice Test

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How are the versions of PoE recognized?

  1. By their data transfer speeds

  2. By their max current and wattage support

  3. By their physical size

  4. By their compatibility with routers

The correct answer is: By their max current and wattage support

The correct answer is recognized by their max current and wattage support. Power over Ethernet (PoE) has different standards, each with specific power delivery capabilities, which are defined by the amount of current (measured in amperes) and the maximum wattage that can be provided to devices over the Ethernet cable. For instance, the initial PoE standard, IEEE 802.3af, provides up to 15.4 watts per port, while subsequent enhancements like IEEE 802.3at (PoE+) can supply up to 30 watts, and IEEE 802.3bt (PoE++) can deliver up to 60 or even 100 watts. Understanding these specifications is crucial for ensuring compatibility between power sourcing equipment (PSE) like switches and powered devices (PD) like IP cameras or wireless access points. Recognizing the versions based on current and wattage support helps network engineers design and deploy PoE systems that meet the power requirements of their devices effectively. Other options, such as data transfer speeds, do not reflect the power capabilities of PoE and are not used to distinguish between the various standards. Likewise, while physical size may relate to the form factor of connectors and devices, it does not indicate the version of Po

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