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Anonymous users2024-02-06Normally, broadcasts can only be isolated by dividing subnets, but the advent of VLANs broke this law, and it was strange to solve the Layer 3 problem with Layer 2 stuff, but it did. VLAN Chinese called virtual local area network, its role is to logically divide the physically interconnected network into a number of unrelated networks, these networks are unable to communicate with each other, as if there is no connection between each other, so the broadcast is also separated.
The implementation principle of VLAN is very simple, through the control of the switch, the switch sends packets sent by a member of a VLAN to other members of the same VLAN, and will not send packets to computers other than the members of the VLAN.
The purpose of using VLAN is not only to isolate broadcasting, but also to apply security and management, such as isolating important departments from other departments through VLAN, even if they are on the same network, they can ensure that they cannot communicate with each other, and ensure the data security of important departments; You can also divide VLANs according to different departments, personnel, and locations, and assign different permissions to manage them.
There are many kinds of VLAN division, we can divide according to IP address, according to port, according to MAC address or according to protocol, the common division method is to combine port and IP address to divide VLAN, some ports are a VLAN, and configure IP address for the VLAN, then the computer in the VLAN will use this address as the gateway, and other VLANs cannot be in the same subnet as the VLAN.
What if both switches have computers with the same VLAN, we can solve it with VLAN trunk.
If the machine in VLAN1 of switch 1 wants to access the machine in VLAN1 of switch 2, we can set the cascading ports of the two switches as trunk ports, so that when the switch sends the packet out of the cascade port, it will make a mark (tag) in the packet, so that other switches can identify which VLAN the packet belongs to, so that after receiving such a packet, the other switches will only send the packet ** to the VLAN specified in the mark. This completes the intra-VLAN data transmission across the switch. There are currently two standards for VLAN trunks, ISL and ISL, the former is Cisco's proprietary technology, and the latter is an IEEE international standard.
Intranet games? IPX SPX protocol.
Description: IPX SPX protocol is a combination of IPX and SPX protocol, which is a communication protocol developed by Novair in order to adapt to the development of the network, which has strong adaptability, easy installation, and also has a routing function, which can realize communication between multiple network segments. Among them, the IPX protocol is responsible for the transmission of data packets; SPX is responsible for the integrity of packet transmission. >>>More
First of all, I would like to ask. What kind of broadband are you using? If you use telecommunications. >>>More
Switches and road travelers are network equipment, in order to establish a local area network, these two devices must have one, and both can be used, but there is no need for this, just like eating with chopsticks and spoons The switch is mainly to connect multiple computers, and the road traveler not only has the function of the switch, but also has the function of the road game, which can complete the automatic dialing and other functions of ADSL
Virtual LAN: A network segment that connects many organizations.
1) First of all, set the host's ADSL [ Already set up is not used] network neighbor attributes. >>>More