Seek technical information from Cisco and Huawei routers

1. Whether modularization is not directly related to the capabilities of routers and switches, and generally modules are interface modules.

2. After the Internet line is agreed, the telecom department will give you 1-10 public IP addresses, depending on your bandwidth. The main function of the router is NAT (address translation), and the route can be selected as a static route.

3. Either buy not only a Layer 3 switch, or buy a Layer 2 switch + router; It doesn't make much sense to buy a Layer 3 switch + router.

4. Whether you want to configure the MAC address binding and VLAN division of the switch depends on your company's business needs. Sailwood.

Premise: The number of terminals is large; If there are many terminal devices (such as PCs and network printers) on the intranet, switches are required to connect these devices.

Example 1, security needs, the intranet server must not be placed in a network segment with the PC terminal, once there is a virus, the PC is fine, you can reinstall the system, the server reinstallation has to start the service again, if the data is destroyed, it is quite troublesome; If you determine that you need to divide the network segments, you must not allow direct access between the network segments, otherwise the segmentation will work, and you need to use Layer 3 devices to divide the VLAN.

2. Management needs, the company does not allow some departments to have network contacts, for example, the sales department is not allowed to access the finance department, but the general manager needs to access the finance, so it is necessary to do the strategy of the equipment.

3. To publish services externally, the company has servers that provide services to the outside world, but external network users cannot directly access the intranet, so they need to do IP mapping or port mapping, which also needs to be supported by three-layer equipment.

There are many other reasons, but in general, the company is not large, the network is not large, and basically these things are not needed, but basic switches, routers are still needed.

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