An internet is made of a combination of physical networks connected by internetworkingdevices such as routers. A packet starting from a source host may pass through severaldifferent physical networks before finally reaching the destination host. The hosts androuters are recognized at the network level by their logical (IP) addresses.However, packets pass through physical networks to reach these hosts and routers.At the physical level, the hosts and routers are recognized by their physical addresses.
đang được dịch, vui lòng đợi..
![](//viimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)