You are the Administrator in charge of the Certkiller servers and are in the process of configuring a external backplane which will be equipped with fibre channel technology, you want to know from the new Certkiller trainee which of the following fibre channel cables can be used for simultaneous, bidirectional data transfers which permit devices to simultaneously send and receive data?

A.
Simplex

B.
Single-mode

C.
Duplex

D.
Multimode

Explanation:
The Duplex cables allow simultaneous, bidirectional data transfers and permits devices to simultaneously send and receive data.
Incorrect Answers:
A: Simplex cables are fiber cables which allows only one-way data transfer.
B: Single-mode cables are used for longer-distance applications D: The multimode cables are Fibre Channel cables that are used for short distance connections spanning over few meters.
Reference:
Server+ Exam Cram 2 (Exam SK0-002), Charles J. Brooks, Que, November 2005, pg 204. pg 204