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1. Ethernet MAC address
Composed of 48-bit binary numbers (globally unique manufacturer address), the
first 24 bits of supplier identification (not unique), and the last 24 bits are the unique identification of the network card (unique)
2. Switch
2.1 The working principle of the switch
1. Learning based on the source MAC address;
2. Forwarding based on the destination MAC address;
3. For frames without a destination MAC address, forwarding to all interfaces of the VLAN (flooding);
4. Receiving broadcast/multicast frames , Forward to all other interfaces of the VLAN;
5. The same MAC address is learned by multiple interfaces, and the interface learned after selection;
6. The same interface can learn multiple MAC addresses.
2.2 Working mode of switch Ethernet interface
Simplex: two data can only transmit data in a single direction;
half-duplex: two data can transmit data in both directions, but not at the same time;
full duplex: two data can be two-way and data at the same time transmission.
2.3 Switch Ethernet interface rate
Negotiate when the interface is connected. If the
negotiation fails, normal communication cannot
Three, the way to manage the switch
3.1 In-band management
It refers to the same logical channel of the network management control information and the user-carrying network, that is, the bandwidth management method. In-band management methods include: WEB, Telnet (the IP of the external network used in Telnet)
3.2 Out-of-band management
It means that the network management control information is not the same logical channel as the user-carrying network, that is, the internal network management method is used. Out-of-band management methods include: Console, Telnet (the internal IP is used for Telnet)
Four, Secure CRT software configuration
