Describe the typical use of LC and SC fiber connectors.

• A. SC is larger and older; LC is small-form factor and widely used
• B. LC is smaller and newer; SC is large-form factor
• C. Both are obsolete
• D. LC only works with copper cables

Answer: (A)

The main idea here is that these two fiber connectors differ in size and how they’re used in practice. SC is larger and uses a bigger ferrule, so it’s a holdover from older network installations. LC, on the other hand, uses a smaller 1.25 mm ferrule, giving a small-form-factor design that lets you pack more connections into the same space. Because modern equipment and data centers prioritize high density and easier handling, LC has become the standard in new deployments and is widely used today. SC remains common in older gear or certain legacy setups, but it isn’t the prevailing choice for new installations. The other statements aren’t accurate: these are fiber connectors, not copper, and they aren’t obsolete.