200-301 Question 36
Single answerA network administrator is deploying IP phones across the organization. These phones will receive both data and power through the same Ethernet cable. The administrator is configuring a switch to provide Power over Ethernet (PoE). Which IEEE standard should the administrator ensure the switch supports to provide PoE functionality for devices requiring up to 30W of power?
- A
IEEE 802.3af
- B
IEEE 802.3at
- C
IEEE 802.3bt
- D
IEEE 802.1Q
Show answer and explanation
Correct answer: B
Explanation
To provide PoE functionality for devices requiring up to 30W of power, the switch must support the IEEE 802.3at standard, also known as PoE+. This standard is an enhancement of IEEE 802.3af, which only supports devices requiring up to 15.4W. IEEE 802.3bt is not necessary for this scenario, as it is designed for higher power requirements.
- A. Incorrect.
IEEE 802.3af defines PoE standards for devices requiring up to 15.4W of power. While this is a PoE standard, it does not meet the requirement for devices needing up to 30W of power.
- B. Correct.
IEEE 802.3at, also known as PoE+, supports devices requiring up to 30W of power, making it the correct choice for this scenario.
- C. Incorrect.
IEEE 802.3bt is the most recent PoE standard, supporting devices requiring significantly more power (up to 60W or 100W depending on the implementation). While relevant to PoE, it is not necessary for the devices described in this scenario.
- D. Incorrect.
IEEE 802.1Q is unrelated to PoE. It defines VLAN tagging on Ethernet frames, which is not relevant to powering devices.