The Border Gateway Protocol (BGP) is an interautonomous system （） protocol. The primary function of a BGP speaking system is to exchange network （） information with other BGP system. This network reachability information includes information on the list of Autonomous System (ASs) that reachability information traverses. BGP-4 provides a new set of mechanisms for Supporting （） interdomain routing. These mechanisms include support for advertising an IP （） and eliminate the concept of network class within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including （） of AS paths. These changes provide support for the proposed supernettting scheme.

BGP-4 also introduces mechanisms that allow aggregation of routes, including （） of AS paths.

A．reservation

B．relation

C．aggregation

D．connection

超高设置的常用方式有（）。

A、围绕未加宽的路面内边缘旋转

B、以行车道中心为轴旋转

C、以中央分隔带中心为轴旋转

D、以道路中心线作为轴旋转