layer 2 network switch

Internal High-Speed interfaces (usually at a rate of over 10 Gbit/s) for interconnection between modules. Currently, Cisco, Extreme,, gangwan, and other vendors have launched CrossBar-based core switch products. However, many products on the market still use gigabit port interconnection, it is mainly intended for users with high performance requirements and high price sensitivity. 2. Access Control Based o

CrossBar technology, two types of layer-3 switching chips are generally used: one is an exchange chip that can generate Gigabit and MB ports; one is a CrossBar chip that only outputs Internal High-Speed interfaces (usually at a rate of over 10 Gbit/s) for interconnection between modules. Currently, Cisco, Extreme,, gangwan, and other vendors have launched CrossBar-based core switch products. However, many

In recent years, with the rapid development of Internet/Intranet and the wide application of the B/S computing model, the cross-region and cross-network business has experienced a sharp increase. The industry and users are deeply aware of the bottleneck effect of traditional routers in the network. A layer-3 switch can

also some disadvantages of using the network layer to define VLANs. Compared with the form of MAC address, VLAN based on the network layer needs to analyze the address formats of various protocols and convert them accordingly. Therefore, a layer-3

The layer-3 Switch has become one of the most important devices in the network. Here we analyze the technical principles of the layer-3 switch in the exchange technology, a device with the layer-3

proven solution for this type of attack, based on several key technologies: 　　 Port Security FeatureDHCP snoopingDynamic ARP Inspection (DAI)IP Source Guard 　　 The following sections focus on the current very typical two-layer attack and spoofing how to combine and deploy the above technologies on a Cisco switch to prevent "man-in-the-middle" attacks, Mac/cam attacks, DHCP attacks, address spoofing, etc. i

information must pass through the routing device or support layer-3 switches. 3) more effective control of broadcast trafficIn traditional local area networks, broadcast traffic may cause congestion because data is sent to all devices, whether or not they need it. VLAN can improve network efficiency and set the devices that need to communicate in the same VLAN. 4) reduce routing requirementsVLAN routing in

exchange chip that can generate Gigabit and MB ports; one is a CrossBar chip that only outputs Internal High-Speed interfaces (usually at a rate of over 10 Gbit/s) for interconnection between modules. Currently, Cisco, Extreme,, gangwan, and other vendors have launched CrossBar-based core switch products. However, many products on the market still use gigabit port interconnection, it is mainly intended for users with high performance requirements and

switching chips are generally used: one is an exchange chip that can generate Gigabit and MB ports; one is a CrossBar chip that only outputs Internal High-Speed interfaces (usually at a rate of over 10 Gbit/s) for interconnection between modules. Currently, Cisco, Extreme,, gangwan, and other vendors have launched CrossBar-based core switch products. However, many products on the market still use gigabit port interconnection, it is mainly intended fo

[Network layer] Analysis Network Layer-Internet Control Packet Protocol ICMP (Internet Control Message Protocol) 1) Message format: the ICMP packet is encapsulated into the data part of the IP packet, and the data part of the ICMP packet is the first eight bytes (IP address and port number) of the IP header and data pa

a layer-3 test. Take the outstanding layer-3 Switch DGS3308TG of Digital China D-Link as an example. We connect the eight Gigabit ports of the vswitch with the eight Gigabit ports on the IXIA1600 tester. We configure the layer-3 Switch DGS3308TG, set the eight ports to eigh

cannot connect the LAN to the WAN or the Internet, because the routing protocols supported by layer-3 switches are very limited. After all, this is not its main function. We know that on the LAN, a layer-2 switch identifies the packet sender through the source MAC address and forwards the packet according to the desti

IP Control Protocol The IP protocol is only responsible for transmitting IP packets and cannot detect and control problems in the network. These tasks are completed through the Internet control protocol. ICMP (Internet Control Message Protocol) (1) The IP protocol provides the best-effort communication service. (2) The loss, repetition delay, and disorder of data packets are inevitable. (3) ICMP provides

Gbit/s) for interconnection between modules. Currently, Cisco, Extreme,, gangwan, and other vendors have launched CrossBar-based core switch products. However, many products on the market still use gigabit port interconnection, it is mainly intended for users with high performance requirements and high price sensitivity. 2. Access Control Based on hardware line rate As the number of users in the

hacker attacks and virus intrusion, The vswitch must be able to maintain its efficient data forwarding rate without being disturbed by attacks, this is the most basic security function required by the vswitch. At the same time, as the core of the entire network, vswitches should be able to differentiate and control permissions for users who access and access network information. More importantly, vswitches

Since Layer-3 switches can be considered as composed of routers and common switches, You can first try to install some modules with routing functions during assembly, in this way, there is a layer-3 Switch rich in routing functions. Its functions are equally powerful. Recently, the price of vswitches has been greatly reduced. Some models of some domestic brands h

The 1-gigabit layer-3 switch is quite common, so I have studied the 1-gigabit layer-3 Switch with high port flexibility. Here I will share it with you and hope it will be useful to you. After the success of the Gigabit center switch gmt7324, NETGEAR recently launched a more

routing protocols to generate route tables, and running ARP to parse IP addresses; set the cache IP Forwarding Table item. As a basic network, the IP network is evolving into a multi-service network. Therefore, network devices must provide a data operation platform for different policies. In the smart architecture of