In networking, a trunk is a communication line or physical link designed to carry multiple signals simultaneously to provide network access between two points. Trunks typically connect switching centers in a communications system and can consist of several wires, cables, or fiber optic strands bundled together in a single physical cable to maximize the available bandwidth. Trunking is a key architectural component of VLANs (Virtual Local Area Networks) . In VLANs, a physical network is virtualized to create several logical networks that are independent broadcast domains. The main physical communications link is the trunk, and switches connected to the trunk provide the branches out to support many client devices. Trunking enables logical separation and isolation of VLAN traffic while increasing network efficiency by lowering the number of physical links required. It makes it possible to use resources effectively, improve network performance, and simplify managing and controlling traffic flow between VLANs. There are three types of trunking: link aggregation, VLAN trunking, and IP trunking.