CompTIA Network+ Practice Test

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What are Midspans in the context of Power over Ethernet?

Power injectors that are built into the device
Devices used for data routing
In-line power injectors
Network management software

The correct answer is: In-line power injectors

Midspans, in the context of Power over Ethernet (PoE), refer to devices known as in-line power injectors. They serve to supply power to network devices such as IP cameras, VoIP phones, and wireless access points over the same Ethernet cable that carries data. This allows for a simplified cabling system since there is no need for separate power outlets near each powered device. Midspans are particularly useful in situations where the power sourcing equipment (PSE), like a PoE switch, is not available or practical. By inserting a midspan into the cabling, power can be injected into the Ethernet line without interrupting the data transmission, ensuring that the powered devices can both receive power and communicate effectively over the network. Understanding the role of midspans is crucial for network designers and technicians, as they enhance flexibility and simplify the deployment of powered devices in networked environments.