| 单词 | router |
| 释义 | router An intelligent switch capable of deciding where to forward packets based on a view of the network as a whole. A router is a programmable device that works with other routers, via a routing protocol, to establish the best path on which to forward a packet with a given address. A router can consider the network as a whole in determining the route for a given call. A router can be programmed to consider a number of factors including the addresses of the originating and destination devices, the least-cost route, the least congested route, the route with the fewest number of hops, and the geographically shortest route. Routers operate at least at Layer 3, the Network Layer, of the OSI Reference Model. Simple switches operate at Layer 2, the Data Link Layer, seeing only an individual link, and having no sense of the larger network. Depending on the applications, routers can operate at higher layers, as well, including Layer 7, 74570c18.qxd 9/12/07 12:39 AM Page 421 |
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