Quick CCNA check: can you choose the right cable?
Testing your physical layer knowledge for the Cisco CCNA exam. Drop your answer in the comments before the timer runs out!
The question
You need a 10 Gbps link between buildings 2 km apart. Which cable type is required?
The answer
A Single-mode fiber (SMF)
Single-mode fiber uses lasers to easily span kilometers, whereas multimode taps out well under five hundred meters at ten gig. Remember, copper hard-stops at one hundred meters. Follow for tomorrow's rep.
Exam tip
Read what the question is actually asking before looking at the options. The wrong answers here are ones candidates genuinely pick — each is true of something adjacent, just not of what was asked.