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局域网交换机是通过一种( )的方法，自动地建立和维护一个记录着目的MAC地址与设备端口映射关系的交换表。
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Female Bullfighting It was a unique, eye-catching sight: an attractive woman in a shiny bullfighter’s suit, sword in hand, facing the sharp horns of a black, 500-kilogram beast. Most people thought the days of female bullfighting were over in Spain. (46) . The first woman fighter, Cristina Sanchez, quit in 1999 because of male discrimination (歧视). But Vega is determined to break into what could be Spain’s most resistant male field. (47) . Spanish women have conquered almost all male professions. (48) "The bull does not ask for your identity card," she said in an interview a few years ago. She insisted that she be judged for her skills rather than her femaleness. Vega became a matador (斗牛士) in 1997 in the southwestern city of Caceres. (49) She entered a bullfighting school in Malaga at age nine and performed her first major bullfight at age 14. She has faced as much opposition as Sanchez did. And the "difficulties have made her grow into a very strong bullfighter," her brother Jorge says. The 1.68-metre tall and somewhat shy Vega says her love of bullfighting does not make her any less of a woman. (50) .A She intends to become even better than Sanchez was.B Her father was an aspiring (有雄心壮志的) bullfighter.C But many bullfighting professionals continue to insist that women do not have what it takes to perform the country’s "national show".D "I’m a woman from head to toe and proud of it," she once said.E She looks like a male bullfighter.F But recently, 29-year-old Mari Paz Vega became the second woman in Spanish history to fight against those heavy animals.
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路由信息协议RIP是内部网关协议IGP中使用最广泛的一种基于 (1) 的协议，其最大的优点是 (2) 。RIP规定数据每经过一个路由器，跳数增加1，实际使用中，一个通路上最多可包含的路由器数量是 (3) ，更新路由表的原则是使到各目的网络的 (4) 。更新路由表的依据是：若相邻路由器X说“我到目的网络Y的距离是N”，则收到此信息的路由器K就知道：“若将下一站路由器选为X，则我到网络Y的距离为 (5) 。
网络工程是一项复杂的系统工程，一般可分为网络规划、网络设计、工程实施、系统测试验收和运行维护等几个阶段。网络规划是在需求分析的基础上，进行系统可行性分析和论证，以确定网络总体方案。网络规划阶段任务完成之后转入下一阶段，即网络设计阶段。 在网络规划阶段“系统可行性分析和论证”的主要内容是什么(控制在150个字以内)
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