N10-005 · Question #819
A technician testing an Ethernet card uses a cable wired with pins 1,2 to pins 3,6 on the same RJ-45 plug. Which of the following describes what the technician is using?
The correct answer is C. Loopback. An Ethernet loopback plug is created by cross-connecting the transmit pins (1,2) to the receive pins (3,6) on a single RJ-45 connector, allowing a NIC to send and receive its own signal for self-testing.
Question
A technician testing an Ethernet card uses a cable wired with pins 1,2 to pins 3,6 on the same RJ-45 plug. Which of the following describes what the technician is using?
Options
- ARS-232
- BRollover cable
- CLoopback
- DPoint to point cable
How the community answered
(40 responses)- A3% (1)
- B5% (2)
- C93% (37)
Why each option
An Ethernet loopback plug is created by cross-connecting the transmit pins (1,2) to the receive pins (3,6) on a single RJ-45 connector, allowing a NIC to send and receive its own signal for self-testing.
RS-232 is a serial communication standard using DB-9 or DB-25 connectors, not RJ-45, and is unrelated to Ethernet NIC testing.
A rollover (console) cable reverses all 8 pins (1-to-8, 2-to-7, etc.) across two separate RJ-45 connectors and is used for console access to Cisco devices, not NIC loopback testing.
A loopback plug for Ethernet connects pin 1 to pin 3 and pin 2 to pin 6 on the same RJ-45 plug, routing transmitted signals back into the receive lines of the same NIC. This lets a technician verify that the network interface card can both send and receive data without requiring an external device or network.
A point-to-point cable connects two separate devices; a loopback plug loops back on a single connector attached to one device.
Concept tested: Ethernet loopback plug wiring for NIC testing
Source: https://www.comptia.org/training/resources/exam-objectives
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