hi all,always i'm confusing in the difference between Asynchronous & Synchronous connections.and why Serial Interfaces are called "Synchronous"??why some asyncrounous sonnection used by communication servers or through the auxiliary port on a router ...

i read in a cisco white paper a comparision between IS-IS and OSPF. the IS-IS was prefered because the core area in the IS-IS is extensible, the reason why is that? because in IS-IS the area border lie "on links" not "inside router" as for OSPF. so i...