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.

The primary function of a BGP speaking system is to exchange network （） information with other BGP system.

A．secubility

B．reachability

C．capability

D．reliability

常见的卸货作业设备包括( )。

A．装卸设备和运输设备
B．装卸设备和堆放设备
C．运输设备和堆放设备
D．装卸设备和包装设备