计算机名词定义（Computer terminology definition）.doc

计算机名词定义（Computer terminology definition） Portal: the original meaning refers to the entrance of the main entrance and the entrance of a house; later it is extended to a faction, a sect, a family, a family, etc.. Nowadays, many web portals used in the Internet are Web sites that are integrated with diverse content services, also known as web portals. Now it is generally considered that the network portal is the starting point for visitors on the Internet. People enter the Internet world through this gate, and they can also be regarded as the starting port on the Internet and the first stop on the internet. ---------------------------------------------------------------------- Routing: routing refers to the process of determining the end-to-end range of the network from the source to the destination when the packet is [1]. Routing works on the third layer of the OSI reference model packet forwarding device at the network layer. Routers connect networks by forwarding packets. Although routers can support a variety of protocols (such as TCP/IP, IPX/SPX, AppleTalk and other protocols), most routers in China run TCP/IP protocols. Routers usually connect two or more logical ports identified by a IP subnet or point to point protocol, and have at least 1 Physical ports. The router determines the output port and the next hop address based on the network layer address received in the packet, and the routing table maintained within the router, and overwrites the link layer data for forwarding packets in Baotou. A router maintains the routing table by dynamically maintaining the routing table to reflect the current network topology and exchanging routing and link information through other routers on the network. Work principle: the router is third layer network equipment, so that you may not understand, say the hub and switch. Hub work in the first layer (i.e. physical layer), it has no intelligent processing ability, for it, data is current, current when a port to the hub, it s