PoE and Injectors for Data and Power
Which of the following can carry data and electricity to network devices? (Choose two.)
Community Insight
The question tests knowledge of networking hardware and standards by asking which options enable dual transmission; the trap is confusing the standard (PoE) with the enabling device (Injector).
Power over Ethernet (PoE) is the technology that allows network cables to transmit both electrical power and data, while a PoE injector is the hardware device used to add this capability to non-PoE networks.
Learners often select 'Access point' or 'Switch' because these devices utilize PoE, but they do not inherently define the mechanism of carrying electricity and data together in the context of the question's phrasing.
Community Discussion (7 comments)
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Expert Analysis
Why the Answer Is Correct
The correct answers are B. Injector and E. PoE. PoE (Power over Ethernet) is the IEEE standard/technology that defines how electrical power is carried alongside data on twisted-pair Ethernet cabling. A PoE injector is a specific hardware device used to combine power and data onto a single cable when the connected switch does not support PoE natively. Both options directly address the capability described in the question.Why the Other Options Are Wrong
A Router (A), Cable modem (C), Access point (D), and Unmanaged switch (F) are network devices. While many modern switches and access points support PoE, the devices themselves are not the definition of the technology that carries electricity and data; rather, they are endpoints or intermediate nodes that may utilize it. An access point typically receives power via PoE or a separate adapter; it does not inherently carry electricity to other devices unless it is a PoE source, but even then, 'PoE' and 'Injector' are the more precise terms for the mechanism itself.Community Comment Notes
Community consensus strongly favors B and E. Users note that 'PoE' is the obvious technology answer. Regarding the 'Injector', comments clarify that it is the physical tool used to inject power into the line, making it the complementary hardware answer to the technological standard of PoE. One user noted that exam sources sometimes have formatting issues, but the technical logic holds for B and E.Exam Strategy
When asked what 'carries' data and electricity, look for the standard name (PoE) and the primary hardware method of implementation (Injector or PSE-enabled Switch). Distinguish between the technology/standard and the end-device that consumes the power.
Frequently Asked Questions
Why is an Access Point incorrect?
An AP is a device that connects wirelessly; it is an endpoint that often receives power via PoE, but it is not the mechanism that defines carrying power and data.
What is the difference between PoE and an Injector?
PoE is the IEEE standard/technology for transmitting power over Ethernet. An Injector is a physical device that implements this technology by combining power and data signals.
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