Home » CompTIA » JK0-019 » Which of the following is the MOST likely cause?
A network administrator tests a multimode fiber cable from end-to-end on a new link that is down and notices that the dB loss is -.09. Which of the following is the MOST likely cause?
A. TXRX reversed
B. dB loss too high
C. dB loss too low
D. Bad connectors
Correct Answer: A
Explanation/Reference:
Explanation:
Some Ethernet switches support medium dependent interface crossover (MDIX),which allows a switch port to properly configure its leads as transmit (Tx) or receive (Rx) leads. You can interconnect such switches with a straight-through cable (as opposed to a crossover cable). However, if a network device does not support MDIX, it needs an appropriate cable (that is, a crossover cable ) to allow its Tx leads to connect to the Rx leads on a connected device, and vice versa.
Therefore, care must be taken when selecting cable types interconnecting network components.
