Ethernet concept
Ethernet provides connectionless, unreliable service
Connectionless: There is no "handshake" between sender and receiver.
Unreliable: The sender's data frame is not numbered, the receiver does not confirm to the sender, the error frame is directly discarded, and the error correction is the responsibility of the upper layer.
Ethernet only achieves error-free reception, not reliable transmission.
Development of Ethernet Transmission Medium and Topological Structure
10BASE-T Ethernet
10BASE-T is a twisted pair Ethernet that transmits baseband signals . T means twisted pair. Now 10BASE-T uses unshielded twisted pair (UTP), and the transmission rate is 10Mb/s.
Adapters and MAC addresses
In a local area network, the hardware address is also called a physical address, or a MAC address.
MAC address: Each adapter has a globally unique 48-bit binary address, the first 24 bits represent the manufacturer, and the last 24 bits are designated by the manufacturer. Commonly used 6 hexadecimal numbers.
Ethernet MAC frame
high speed ethernet
Ethernet with a rate >=100Mb/s is called high-speed Ethernet.
1.100BASE-T Ethernet is
a star topology Ethernet that transmits 100Mb/s baseband signals on twisted pairs, and still uses the IEEE802.3CSMA/CD protocol. Support full-duplex and half-duplex, can work in full-duplex mode without conflict.
2. Gigabit Ethernet
sends 1Gb/s signal on optical fiber or twisted pair. Support full-duplex and half-duplex, can work in full-duplex mode without conflict.
3.10 Gigabit
10 Gigabit Ethernet transmits 10Gb/s signals on optical fibers.