配置访问控制列表时，首先需要定义一个标准或扩展的______。
参考答案：访问控制列表
解析：
[分析]： 配置访问控制列表时，首先需要定义一个标准或扩展的访问控制列表，访问控制列表使用包过滤技术，在路由器上读取第三层及第四层包头中的信息如源地址、目的地址、源端口、目的端口等，并通过一定的过滤准则，实现了基于源地址、目的地址、端口号以及各种协议的数据包的过滤，从而达到访问控制的目的。
| 阅读短文，判断句子正(T)误(F)。 | |
a cup of coffee (咖啡) and then goes to work. One morning he is still sitting at the breakfast table and reading newspapers at 8 o'clock. He asks his wife for another (另一个) cup of coffee. His wife is very confused (疑惑的) and asks him, " Aren't you going to the office today? " " The office? " He jumps up from his chair, " I think I am at the office." ( ) 1. Bob is an office clerk (职员 ). ( ) 2. Bob eats breakfast at eight o'clock. ( ) 3. Bob doesn't drink coffee in the morning. ( ) 4. Bob asks his wife for his coat. ( ) 5. Bob thinks he is at the office. |