在互联网中，中继链接（Trunking）是一种俗称，广泛用于Link Aggregation与VLANS。

利用并联的方式将多个网络线或端口集合在一起，使传输速度超越原先单一网络线或端口的效率，例如：将2条100Mbps的网络线透过Link Aggregation Control Protocol之后，带宽可提升至200Mbps，应用于交换器之间的连接。 常见的协议有Link Aggregation Control Protocol、PAgP及EtherChannel。

In telecommunications, trunking is a method for a system to provide network access to many clients by sharing a set of lines or frequencies instead of providing them individually. This is analogous to the structure of a tree with one trunk and many branches. Examples of this include telephone systems and the two-way radios commonly used by police agencies. More recently port trunking has been applied in computer networking as well.