The Border Gateway Protocol (BGP) is an interautonomous system. ___49___ protocol. The primary function of a BGP speaking system is to exchange network ___50___ information with other BGP system. This network reachability information includes information on the list of Autonomous System (ASs) that teachability information traverses. BGP-4 provides a new set of mechanisms for supporting ___51___ interdomain routing. These mechanisms include support for advertising an IP ___52___ and eliminate the concept of network class within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including ___53___ of AS paths. These changes provide support for the proposed supernettting scheme.

50（）

A. teachability

B. scalablity

C. availability

D. reliability

建立账套
(1)账套信息
账套编码：003；账套名称：甲公司；采用默认账套路径；启用会计期：2008年1月；会计期间设置：1月1日至12月31日。
(2)单位信息
单位名称：甲公司。
(3)核算类型
该企业的记账本位币：人民币；企业类型：商业；行业性质：新会计制度科目。
(4)基础信息
进行经济业务处理时，需要对存货、客户、供应商进行分类。
(5)分类编码方案
(6)数据精度
该企业对存货数量、单价小数位定为2。
增加操作人员
001考生姓名—账套主管，具有系统所有模块的全部权限，002李松—出纳，003蔡立国—会计。