DRAG DROP Match the most cost-effective option for cabling each requirement. (All lengths indicate total cable length including patch cable(s), service loops, etc. where used.) 
100Gb 3M = single mode fiber, 1Gb 100' = Cat 6a, 10Gb 200' = DAC, 1Gb 2km = multimode fiber. I don’t think DAC is valid for the longer run since that’s way past its limit, and single mode at short range is often cheaper at high speeds than multi or fancy copper in enterprise gear. Trap here is thinking DAC for the shortest span (common on CCNA), but that usually maxes at ~10m and gets pricey fast. Pretty sure this lines up with exam practice sets-open to corrections if anyone's actually priced these builds recently.
Pretty standard picks for cost. 100Gb at 3m needs single mode fiber, Cat6a works for that 100' desktop run, DAC cable does best for 10Gb over 200', and multimode fiber is cheapest for that long 2km link. I've seen similar on other exams, open to corrections if I'm missing something.
100Gb 3M = single mode fiber, 1Gb 100' = Cat6a, 10Gb 200' = DAC cable, 1Gb 2km = multimode fiber. I think that's the most cost-effective lineup since copper can't do long runs at that speed and multimode fiber is overkill for anything short. Pretty confident based on exam reports-anyone have a real-world counterexample?
If the question said "most future-proof" instead of "most cost-effective," would you still pick single mode for the 3M 100Gb link?
Seen similar configs before. For cost, I’d map it as:
100Gb 3M → single mode fiber
1Gb 100' → Cat6a
10Gb 200' → DAC cable
1Gb 2km → multimode fiber
Pretty sure that’s cheapest overall in this lineup but not 100% convinced on DAC vs. fiber for the 10Gb stretch. Anyone disagree?
