Traditional IP packet forwarding analyzes the（ ）IP address contained in the network layer header of each packet as the packet travels from its source to its final destination.A router analyzes the destination IP address independently at each hop in the network.Dynamic（请作答此空）protocols or static configuration builds the database needed to analyze the destination IP address（the routing table）.The process of implementing traditional IP routing also is called hop-by-hop destination-based（ ）routing.Although successfp，and obviously widely deployed，certain restrictions，which have been reapzed for some time，exist for this method of packet forwarding that diminish is（ ）.New techniques are therefore required to address and expand the functionapty of an IP-based network infrastructure.This first chapter concentrates on identifying these restrictions and presents a new archiecture，known as mptiprotocol（ ）switching，that provides solutions some of these restrictions.