220-802 · Question #3
Which of the following settings MUST be configured in order to turn on a VoIP phone?
The correct answer is A. PoE. VoIP phones receive both data and electrical power through a single Ethernet cable using Power over Ethernet (PoE), which must be enabled on the switch port to turn the phone on.
Question
Which of the following settings MUST be configured in order to turn on a VoIP phone?
Options
- APoE
- BFlow control
- CVPN
- DDuplex speed
How the community answered
(45 responses)- A96% (43)
- B2% (1)
- D2% (1)
Why each option
VoIP phones receive both data and electrical power through a single Ethernet cable using Power over Ethernet (PoE), which must be enabled on the switch port to turn the phone on.
PoE (Power over Ethernet), defined in IEEE 802.3af/at, delivers DC electrical power over standard twisted-pair Ethernet cabling alongside data. Most VoIP phones have no separate power adapter and rely entirely on PoE from the network switch to operate. Without PoE enabled on the switch port, the phone cannot power on at all.
Flow control (IEEE 802.3x) manages data transmission rates between devices to prevent buffer overflow but is not related to powering a phone.
VPN creates an encrypted network tunnel for secure remote communication and is not required simply to power on and initialize a VoIP phone.
Duplex speed settings affect data transmission performance but do not supply the electrical power needed to turn on a VoIP phone.
Concept tested: Power over Ethernet (PoE) for VoIP phones
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/network-subsystem/net-sub-interface-poe
Topics
Community Discussion
No community discussion yet for this question.