The main process of data transmission by unmanaged switches is as follows:
Data frame reception: When the unmanaged switch receives a data frame, it will first check the destination MAC address of the data frame. If the destination MAC address corresponds to a port on the switch, the data frame is received and stored in the switch's buffer.
MAC address learning: Unmanaged switches have the ability to learn MAC addresses. When the switch receives a data frame, it records the source MAC address and corresponding port number into the MAC address table. In this way, the next time a data frame is sent to the MAC address, the switch can directly send the data frame to the corresponding port without broadcasting it again.
Data frame forwarding: When an unmanaged switch receives a data frame, if the target MAC address of the data frame is not in the MAC address table, or the target MAC address is a broadcast address or a multicast address, the switch will broadcast the data frame to all port. In this way, the data frame can be forwarded to other devices in the network.
Filtering and forwarding: Unmanaged switches also have filtering functions that can filter data frames based on specific fields of the data frames (such as protocol type, port number, etc.). For example, a switch can filter out all frames whose destination MAC address is a broadcast address, or filter out all packets for a specific protocol.
Error handling: Unmanaged switches also have error handling mechanisms. For example, when a switch detects a fault on a port, it can shut down the port to prevent the fault from expanding. In addition, the switch can also detect and handle CRC errors, flow control errors, etc. of data frames.
In short, unmanaged switches realize data transmission through processes such as receiving, learning, forwarding, filtering, and error handling. These processes enable unmanaged switches to handle data transmission tasks efficiently and ensure reliable transmission of network data.