Final answer:
Multifilament fiber is the fiber configuration that does not require knots due to its many fine threads that are twisted together, thus providing strength through interlocking.
Step-by-step explanation:
The type of fiber configuration that does not require knots is multifilament. In contrast to a monofilament, which is a single continuous filament, a multifilament consists of many fine threads or filaments that are twisted together to form a single yarn. Because of this construction, the fibers in a multifilament are interlocked, and this interlocking provides strength and eliminates the need for knots. This type of fiber is commonly used in textiles for apparel, home furnishings, and industrial uses, such as in ropes and fishing nets.
On the other hand, 'barb' is typically used to describe a type of fish hook or an element in fencing. While this term does not directly relate to fiber configurations in textiles, one might see the term in discussions regarding the physical characteristics of certain tools or equipment that feature pointed ends designed to prevent easy removal.