Giraffes are the tallest land animals on Earth, reaching heights of up to 19 feet (5.8 meters). They have long necks that can be up to 6 feet (1.8 meters) long. Giraffes also weigh much more than llamas, with some males weighing up to 4,000 pounds (1,814 kilograms).
Llamas are smaller than giraffes, reaching heights of up to 6 feet (1.8 meters) and weighing up to 300 pounds (136 kilograms). They have shorter necks than giraffes, at around 3 feet (0.9 meters) long.
In a fight, the giraffe would be able to use its long neck to swing its head at the llama. The giraffe's hooves are also sharp and could be used to kick the llama. The llama's main defense would be its sharp teeth and its ability to spit.
While the llama might be able to land a few blows on the giraffe, the giraffe's larger size and longer neck would likely give it the advantage in a fight.