如图1所示，在某DHCP客户机上捕获了5条报文，表中对第5条报文进

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问题填空题

如图1所示，在某DHCP客户机上捕获了5条报文，表中对第5条报文进行了解析，图2是在该客户机捕获上述报文后执行ipconfig/all命令后得到的信息。分析捕获的报文，并补全图中的信息。

图1 在DHCP客户机上捕获的IP报文及相关分析

图2 在DHCP客户机执行ipconfig/all获得的信息

（1）处填（）

答案

参考答案：255.255.255

解析：

根据截图中编号1、2、3、4、5通过三次握手源主机最后只发送确认报文ACK。根据对应的DHCP报文摘要中的请求和返回IP，可知192.168.1.36请求的返回地址为255.255.255.255。

单项选择题

In the United States, older people rarely live with their adult children. But in many other cultures children are expected to care (1) their aged parents. In some parts of Italy, the percentage of adult children who (2) with their parents (3) 65 to 70 percent. In Thailand, too, children are expected to take care of their elderly parents; few Thai elderly live (4) . What explains these differences in living arrangements (5) cultures Modernization theory (6) the extended family household to low levels of economic development. In traditional societies, the elderly live with their children in large extended family units for economic reasons. But with modernization, children move to urban areas, leaving old people (7) in (8) rural areas. Yet modernization theory cannot explain why extended family households were never common in the United States or England, or why families in Italy, which is fully modernized, (9) a p tradition of intergenerational living. Clearly, economic development alone cannot explain (10) living arrangements. Another theory associated intergenerational living arrangements with inheritance patterns. In some cultures, the stem family pattern of inheritance (11) . (12) this system, parents live with a married child, usually the oldest son, who then (13) their property when they die. The stem family system was once common in Japan, but changes in inheritance laws, (14) broader social changes brought (15) by industrialization and urbanization, have (16) the (17) .In 1960 about 80 percent of Japanese over 65 lived with their children; by 1990 only 60 percent did-a figure that is still high (18) U.S. standards, but which has been (19) steadily. In Korea, too, traditional living arrangements are (20) : the percentage of aged Koreans who live with a son declined from 77 percent in 1984 to 50 percent just 10 years later. Although most elderly Koreans still expect to live with a son, their adult children do not expect to live with their children when they grow old.