What type of knot is used as a safety to a back up knot?

• A. Double Overhand Knot
• B. Barrel Knot
• C. Square Knot
• D. Clove Hitch

Answer: (B)

When you set a primary knot, you often add a backup knot to guard against it slipping. To keep that backup knot from loosening under load, you use a safety knot. The barrel knot is designed for exactly that role: it’s a compact, sturdy stopper tied around the backup knot that locks it in place and resists movement as tension is applied. That makes it the best choice for a safety to a backup knot.

The other options aren’t used for this purpose: the double overhand can function as a backup knot itself but isn’t specifically a safety knot to guard another knot; the square knot is unreliable under load; the clove hitch serves for securing rope to an object, not for safeguarding a backup knot.