What is the correct cable type to use when connecting a pair of switches using Long Range (LR) Transceivers?

What is the correct cable type to use when connecting a pair of switches using Long Range (LR) Transceivers?
A . Direct Attach Cable (DAC)
B . Twin-Ax
C . Single Mode Fiber
D . Multi-mode Fiber

View Answer

Answer: C

Explanation:

Single-mode uses a single relatively straight beam of light, transmitted directly through a core of glass (or occasionally plastic) that’s usually 50 microns across. Single-mode accommodates large power levels, and is almost exclusively used for Long Range (LR) applications.

Reference: https://info.hummingbirdnetworks.com/blog/answering-your-frequently-asked-questions-about­different-types-of-10-gigabit-cisco-sfp-units