Measure the test taker's understanding about the basic technical indicators of LAN switches.

LAN switches are quite common, So I studied the basic technical indicators of LAN switches and shared them here. I hope they will be useful to you. There are many basic technical indicators for LAN switches. These technical indicators fully reflect the technical performance and functions of LAN switches. They are important data for users to refer to when purchasing products, the technical indicators of LAN switches have different meanings. Not all users understand these technical indicators. Therefore, it is of great significance to fully understand these technical indicators.

1. The number of rack slots refers to the maximum number of modules that can be inserted by the rack-mounted LAN switch.

2. The number of expansion slots refers to the maximum number of modules that can be plugged into a fixed configuration LAN switch with expansion slots.

3. the maximum number of LAN switches that can be stacked is the maximum number of LAN switches that can be stacked in the stacking unit of the stackable LAN switch. Obviously, this parameter also shows the maximum port density and information point connection capability provided by a stack unit.

4. The minimum/maximum number of 10G Ethernet ports is the minimum/maximum number of 10G Ethernet ports supported by a LAN switch.

5. The minimum/maximum number of 100 MB Ethernet ports is the minimum/maximum number of 100 MB Ethernet ports supported by a LAN switch.

6. The minimum/maximum number of 1000 MB Ethernet ports refers to the minimum/maximum number of 1000 MB Ethernet ports that a LAN switch can connect.

7. supported network types. Generally, fixed configuration LAN switches with no expansion slot support only one type of network. Rack-mounted LAN switches and fixed configuration LAN switches support more than one type of network, for example, Ethernet, fast Ethernet, Gigabit Ethernet, ATM, licensing ring, and FDDI are supported. The more network types a LAN switch supports, the higher the availability and scalability.

8. Maximum number of ATM ports. The maximum number of ATM ports is the maximum number of ATM ports supported by an atm lan switch or a multi-service multi-functional LAN switch.

9. Maximum number of SONET ports. SONET Synchronous Optical Transmission Network) is a high-speed synchronous transmission network specification with a maximum speed of 2.5 Gbit/s. The maximum number of SONET ports of a LAN Switch refers to the maximum number of downlink SONET interfaces of the LAN switch.

10. the maximum number of FDDI ports is the maximum number of FDDI ports supported by an fddi lan switch or a multi-service multi-functional LAN switch.

11. Backplane throughput, also known as backplane bandwidth, is the maximum data volume that can be transferred between the processor or interface card of a LAN switch and the data bus. The higher the bandwidth of a LAN switch, the stronger the ability to process data, but the higher the design cost.

12. buffer size. It is also called the packet buffer size. It is a queue structure and is used by LAN switches to coordinate the speed matching components between different network devices. Burst data can be stored in the buffer until it is processed by a slow device. The buffer size should be moderate. A large buffer space will affect the forwarding speed of data packets in normal communication, because a large buffer space requires a little more addressing time) and increase the device cost. A small buffer space is prone to packet loss errors when congestion occurs. Therefore, adding an advanced buffer scheduling algorithm to an appropriate buffer space is a reasonable way to solve the buffer problem. Therefore, pay attention to the following aspects in the buffer size of the network trunk device.

1) whether each port has an independent buffer space, and the working status of the buffer space does not affect the buffering status of other ports;

2) whether the module or port is designed with independent input buffer, independent output buffer, or input/output buffer;

3) Whether there are a series of buffer management scheduling algorithms, such as RED, WRED, RR/FQ and WERR/WEFQ.

13. Maximum MAC address table size. Each port or device connecting to the LAN requires a MAC address, which is used by other devices to locate a specific port and update the route table and data structure. The MAC address is 6 bytes long and is allocated by IEEE. It is also called a physical address. The MAC address table size of a device indicates the maximum number of nodes that can be connected to the device.

14. Maximum number of power supplies. Generally, the core equipment provides redundant power supply. After a power supply fails, other power supplies can continue to provide power, without affecting the normal operation of the equipment. When there are multiple power supplies, pay attention to the use of multiple mains supply, so that when one line fails, other lines can still supply power. High-end LAN switches are the core devices of large networks. They must ensure their availability, so they all have power redundancy. In addition, there are table-type LAN switches that also provide AC power plug-ins and DC power plug-in, users need to pay attention to whether the DC power supply voltage meets your requirements.

15. protocols and standards are supported. The protocols and standards supported by LAN switches directly determine the network adaptability of LAN switches. These agreements and standards generally refer to the networking specifications and equipment standards formulated by the International Organization for Standardization.