What is a line card?

A line card is a hardware component that is used in networking devices such as routers, switches, and access points. It is responsible for providing connectivity between the device and the network, as well as processing and forwarding data packets.

Line cards typically contain multiple ports or interfaces that allow the device to connect to other devices or networks. These ports can be Ethernet, fiber optic, or other types of connections, depending on the requirements of the network.

Line cards also often include processing capabilities, such as network processors or application-specific integrated circuits (ASICs), that enable the device to handle and route data packets quickly and efficiently. This helps to improve the overall performance and scalability of the network device.

In modular networking devices, line cards are often hot-swappable, meaning they can be inserted or removed from the device while it is running without causing any disruption to network operations. This allows for easy upgrades or maintenance without having to take the device offline.

Overall, line cards are a critical component of networking devices, enabling them to connect to the network, process data packets, and improve network performance.