CWT Power over Ethernet (PoE) & Cabling Infrastructure

Question 1

Which IEEE standard originally defined Power over Ethernet (PoE), delivering up to 15.4W per port?

Accepted Answer

IEEE 802.3af

Answer

IEEE 802.3at

Answer

IEEE 802.3bt

Answer

IEEE 802.11ac

Question 2

What is the maximum power output per port at the PSE specified by IEEE 802.3at (PoE+)?

Accepted Answer

30 watts

Answer

15.4 watts

Answer

25.5 watts

Answer

60 watts

Question 3

Under IEEE 802.3af, what maximum power is guaranteed at the powered device (PD) after accounting for cable losses?

Accepted Answer

12.95 watts

Answer

15.4 watts

Answer

25.5 watts

Answer

30 watts

Question 4

Which device is used to add PoE capability to an existing non-PoE switch infrastructure?

Accepted Answer

PoE midspan injector

Answer

PoE splitter

Answer

Power distribution unit (PDU)

Answer

Uninterruptible power supply (UPS)

Question 5

What is the minimum recommended cable category for IEEE 802.3at (PoE+) installations?

Accepted Answer

CAT5e

Answer

CAT3

Answer

CAT5

Answer

CAT6A

Question 6

What is the maximum standard cable run length permitted for PoE power delivery?

Accepted Answer

100 meters

Answer

50 meters

Answer

75 meters

Answer

150 meters

Question 7

How does a PoE Power Sourcing Equipment (PSE) detect a valid Powered Device (PD) before applying full power?

Accepted Answer

It applies a low-voltage DC signature detection signal

Answer

It sends a high-voltage pulse to stress-test the cable

Answer

It requires manual port configuration by the administrator

Answer

It uses DHCP to query the device type