需求分析的困难主要体现在四个方面:问题的复杂性、交流障碍、不完备性和不一致性、需求易变性。
查看答案
Choose the best answer to complete each of the following sentences according to the information contained in the listening passage.1) The listening passage mainly shows that ________.
A. it is necessary to tell white lies in life
B. it is important to be truthful to your friend
C. most people tell white lies now and then
D. telling white lies is a way to keep friendship
路由器转发数据包的关键是( )。
A. 目的地址
B. MAC地址
C. 路由表
Preference字段在路由表中代表了( )。
A. 路由器开销
B. 路由优先级
C. 路由的度量
路由器选择最优路由时,首先比较(),再比较(),最后查路由表时根据()选择路由表项,指导数据报文转发。
A. 优先级
B. 最长掩码匹配原则
C. 度量值metric数值
D. 开销cost