Exam N10-008 topic 1 question 13 discussion

It is a fiber network and fiber has insane range thus it is unlikely to be attenuation. Bad device and bad cable are out because they are explicitly tested as described. Therefore TX/RX is the only reasonable option.

Going with A. TX/RX is reversed since it makes the sense to me given the other options: If the TX (transmit) and RX (receive) fibers are reversed in either of the LC/LC patch cables or the cross-connect fiber cable, the data will not be transmitted and received correctly, resulting in a connection failure. Also, I think the question listed the order of the connections and multiple patch panels to suggest that there was good chance of some kind of misalignment going on when the fibers were installed. --------- B. An incorrect cable was used: The question mentions that both patch cables were changed with known working cables, so I doubt that the cables are the issue here or that they would grab the same incorrect cable C. The device failed during installation: They mentioned that the device was tested before installation, so it probably didn't fail during installation either. D. Attenuation is occurring: Attenuation is the loss of signal strength as it travels through a medium. This could make sense if this was over a long distance, but it's a datacenter so the connections are made over a short distance.

Most fiber connections consist of two individual cables, one for transmission of data & one for receiving data. If you're connecting a switch to a workstation using a NIC that has Straight Tip (ST) connections on it, one will be Tx, & one will be Rx. You can check the NIC the ST connections are attached to, the solid orange light will indicates a good idle connection & blinking indicates the network is actively communicating through connection.

I would go for A

I have a hard time believing the answer is A. An LC cable has both the TX/RX in place with one connector, it's not like an ST where the cables could be swapped. My best guess would be B then? Just because the cable is good doesn't mean it's compatible. Based on this from Meyers "Finally, different runs of fiber use different wavelength signals. You might be able to plug an LC connector into a switch just fine, for example, but if the signal starts at 1310 nm and the switch expects 1530 nm, that sort of wavelength mismatch will stop the transmission cold." Still not 100% sure though.

answer is a

Answer is A

We have to understand the difference between crossover and straight through cabling..

Answer is A?

Sorry that was not properly set up

Tx/ Rx are abbreviations for Transmit and Receive respectively so that was was properly set up