200-301 Question 35
Single answerA network engineer is deploying IP phones in a new office and needs to ensure that both data and power are delivered to the devices over a single Ethernet cable. Which of the following must be implemented on the switch to provide this functionality?
- A
Enable Power over Ethernet (PoE) on the switch ports connected to the IP phones.
- B
Configure VLAN tagging for the switch ports connected to the IP phones.
- C
Enable Spanning Tree Protocol (STP) on the switch.
- D
Use fiber optic cables between the switch and the IP phones.
Show answer and explanation
Correct answer: A
Explanation
Power over Ethernet (PoE) is a technology that enables network devices, such as IP phones, wireless access points, and security cameras, to receive both power and data over a single Ethernet cable. This eliminates the need for separate power supplies, simplifying deployment and reducing cable clutter. To enable PoE functionality, the network administrator must configure the switch to supply power to the connected devices.
- A. Correct.
Correct. Power over Ethernet (PoE) allows both power and data to be transmitted over the same Ethernet cable, which is necessary for powering IP phones without separate power adapters.
- B. Incorrect.
Incorrect. VLAN tagging is used to segregate network traffic into different logical networks but does not provide power to devices.
- C. Incorrect.
Incorrect. Spanning Tree Protocol (STP) is used to prevent network loops and does not relate to delivering power to devices.
- D. Incorrect.
Incorrect. Fiber optic cables are used for high-speed data transmission but cannot carry power. PoE works only on copper Ethernet cables.