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Comptia A+ 220-1101 Exam Questions And Answers 2025
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Comptia A+ 220-1101 Exam Questions And Answers 2025
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Terms in this set (100) Q&AComptia A+ 220-1101 Exam Questions
And Answers 2025
802.3af - Allows powered devices to draw up to about 13 W. Power is
supplied as 350mA@48V and limited to 15.4 W, but the voltage drop over
the maximum 100 feet of cable results in usable power of around 13 W.
802.3at (PoE+) - Allows powered devices to draw up to about 25 W, with a
maximum current of 600 mA.
802.3bt (PoE++ or 4PPoE) - Supplies up to about 51 W (Type 3) or 73 W
(Type 4) usable power.
, Terms in this set (100) Q&A
IEEE 802.11a - The IEEE 802.11a standard uses the 5 GHz frequency
band only. The data encoding method allows a maximum data rate of 54
Mbps. The 5 GHz band is subdivided into 23 non-overlapping channels,
each of which is 20 MHz wide.
IEEE 802.11b - The IEEE 802.11b standard uses the 2.4 GHz frequency
band and was released in parallel with 802.11a. The signal encoding
methods used by 802.11b are inferior to 802.11a and support a nominal
data rate of just 11 Mbps.
IEEE 802.11g - The IEEE 802.11g standard offered a relatively
straightforward upgrade path from 802.11b; uses the same encoding
mechanism and 54 Mbps rate as 802.11a but in the 2.4 GHz band used by
802.11b and with the same channel layout. This made it straightforward for
vendors to design 802.11g devices that could offer backwards support for
legacy 802.11b clients.
IEEE 802.11n - The IEEE 802.11n standard introduced several
improvements to increase bandwidth. It can work over both 2.4 GHz and 5
GHz.
The 802.11n standard allows two adjacent 20 MHz channels to be
combined into a single 40 MHz channel, referred to as "channel bonding."
The other innovation introduced with 802.11n increases reliability and
bandwidth by multiplexing signal streams from 2-3 separate antennas. This
technology is referred to as " multiple input multiple output" (MIMO).
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