Ethernet switch manufacturers have launched Layer 2, Layer 3 or even Layer 4 switches basing on market demand. But no matter which kind of switches, its core function is still two-layer Ethernet data packet switching, including certain ability to process IP layer or even higher layer data packets. Now, we’d like to introduce the differences and characteristics of layer 2 switch, layer 3 switch and layer 4 switch in detail.

Status: The network room gateway is a separate cisco 3750G switch. Once the physical device has problems, the entire network will be at risk.

The main functions of the switch include physical addressing, network topology, error checking, frame sequence, and flow control. At present, the switch also has some new features, such as support for VLAN (Virtual Local Area Network), support for link aggregation, and even some have firewall functions.

During the daily use of the switch, we may encounter some failures, the faults of the switch are mainly divided into two categories. The first type is a hardware failure, which is a problem on the hardware. The second type is software failure, which is a problem inside the switch. Now let's troubleshooting the hardware failure.

With the advent of 5G and the arrival of the new Internet of Things, the requirements for switches are higher, and the demand will be greater. The interconnection of all things is inseparable from the essential network equipment--the switch, which will play a vital part in the networking of the Internet of Things.