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What Are The Technical Essentials Of Network Switches Apr 14, 2017

A network switch is a network-extending device that provides more connectivity ports for a subnet to connect more computers. With the development of communication industry and the advancement of national economy informatization, the market of network switches is steadily rising. It has the characteristics of high performance price ratio, highly flexible, relatively simple, easy to implement and so on.
An Ethernet switch is a network device used for electrical signals forwarding. It can provide exclusive access to any two network nodes connected to the switch.
Switches are also called switched hubs, a network device that works on the Mac (Nic-based media access control address) on the OSI Layer 2 (Data link layer, see "wide area Network" definition), identifies, completes encapsulation forwarding packet functionality. It is automatically addressable and exchanged by regenerating the information and forwarding it to the specified port after internal processing. The switch does not understand the IP address, but it can "learn" MAC address and store it in an internal address table, by establishing a temporary swap path between the originator and the target receiver of the data frame, so that the data frame reaches the destination directly from the source address. All ports on the switch have exclusive channel bandwidth to ensure a fast and efficient transfer of data on each port. Because the switch is based on the destination address of the packet being delivered, each packet is sent separately from the source port to the destination port without sending to all ports, avoiding conflicts with other ports, so the switch can simultaneously transmit these packets and prevent transmission conflicts, and improve the actual throughput of the network.
One of the technical Essentials of network switches
Key points of switch selection and main technical conditions of ordering
1) Select reliable technical indicators, exchange speed, Exchange Capacity (Gbps), backplane bandwidth (Gbps), processing Capacity (Mpps), throughput (Mpps).
2) Design the correct test plan, to prepare enough test port to accurately evaluate the real performance of the switch.
3) Select the correct product module configuration, the use of distributed exchange processing structure, all interface modules have the ability to exchange locally, so as to avoid the centralized exchange structure of the central problem of bottlenecks.
4) delay and Delay jitter, select the industry-leading switch for its delay less than 10 microseconds products.
5) support for multicast, commonly used multicast protocols include PIM and DVMRP. The products should support both multicast protocols.
6) The rich interface type, and selects the backbone switches that support Gigabit Ethernet, POS and ATM broadband interfaces simultaneously.
7) Stable Routing Protocol software implementation, the switch on the implementation of the routing protocol (such as BGP, OSPF) needs.
8) support MPLS, the backbone network can be constructed with MPLS can support flow engineering, VPN and many other applications.
9) Switch Order main technical condition is to choose the network data transmission volume, data exchange ability, stable and reliable, uninterrupted operation. Select products on the basis of focusing on high performance, manageability, high reliability, applicability, and performance price ratios.
10) Host Room Switches select size to be installed in the mainframe cabinet.
Switch main specifications and parameters have 8,16,24 port RJ45 ports, rack-19-inch Adaptive Ethernet switches, support network standard 802.3 10BaseT,802.3u100BaseTX, backplane bandwidth: 4.8G packet forwarding rate 10M:14,880pps;100M:148,800pps 10M/100Mbps MAC Address Table 4 K. In addition, there are intelligent and fiber-optic switches, depending on the network situation to choose.
11) Family generally four ports can be used for enterprises.
12) Current models and features are numerous, grades are not the same! Common electronic market can be purchased to!
13) Switches cannot be applied to ADSL dialing, the telephone line cannot be used switch, the switch does not allocate IP address function, the router can allocate IP automatically.