An omnivore is an animal that eats food from both plants and animals.
Animals that eat other animals are called carnivores. Carnivores that eat herbivores are called secondary consumers, and carnivores that eat other carnivores are called tertiary consumers.
MAC - Media Access Control, address is a globally unique identifier assigned to network devices, and therefore it is often referred to as hardware or physical address.
MAC addresses are 6-byte (48-bits) in length, and are written in MM:MM:MM:SS:SS:SS format.