H12-311_V3.0 · Question #274
Which two of the following are PoE power supply standards? (Multiple choice)
The correct answer is B. IEEE 802.3af D. IEEE 802.3at. IEEE 802.3af is the original Power over Ethernet standard (2003), delivering up to 15.4W per port, and IEEE 802.3at (PoE+, 2009) is its upgraded successor, providing up to 30W per port - both are the foundational PoE power delivery standards you need to know. Why the…
Question
Which two of the following are PoE power supply standards? (Multiple choice)
Options
- AIEEE 802.3ae
- BIEEE 802.3af
- CIEEE 802.3as
- DIEEE 802.3at
How the community answered
(26 responses)- A12% (3)
- B73% (19)
- C15% (4)
Explanation
IEEE 802.3af is the original Power over Ethernet standard (2003), delivering up to 15.4W per port, and IEEE 802.3at (PoE+, 2009) is its upgraded successor, providing up to 30W per port - both are the foundational PoE power delivery standards you need to know.
Why the distractors are wrong:
- A (802.3ae): This defines 10 Gigabit Ethernet over fiber - a speed standard, not a power delivery standard.
- C (802.3as): This covers Ethernet frame size extensions, completely unrelated to power delivery.
Memory tip: Focus on the letters f and t - "first" (802.3af = the original PoE) and "turbo" (802.3at = the higher-power upgrade). Both contain "a" + a consonant that's neither "e" (speed) nor "s" (size).
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