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简答题 论文：论信息系统开发方法及应用。
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Traditional network layer packet forwarding relies on the information provided by network layer (1) protocols, or static routing, to make an independent (2) decision at each hop within the network. The forwarding (3) is based solely on the destination (4) IP address. All packets for the same destination follow the same path across the network if no other equal-cost paths exist. Whenever a router has two equal-cost (5) toward a destination, the packets toward the destination might take one or both of them, resulting in 空白（4）处应选择（）
SpyWare and other fonns of malware afe the biggest online threat to your computer's (1) nowadays. There malicious (2) which get to your PC through freeware, shareware, commercial sites, deceptive pop-ups or in any other way, can record your surfing habits and sites you visit, share your personal information with their partners. Any personal (3), when in wrong hands, can leave you a victim of an"identity theft"by steeling your credit (4) details, birth records and other (5) information. 空白（1）处应选择（）
下面的无线通信技术中，通信距离最短的是（）。
某公司的网络地址是202.117.240.0/20，被划分成16个子网，则每个子网的子网掩码为（1），包含的最大的主机数是（2）。 空白（1）处应选择（）
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