问题 问答题


阅读以下说明,回答问题1~5,将答案填入答题纸对应的 解答栏內。
[说明]
某公司有一个局域网,在ISP申请了Internet接入,接入方式是以太网,ISP分配给了一个固定的IP地址为222.152.199.33、子网掩码为255.255.255.252、默认网关为222.152.199.34、DNS为202.102.192.68。该公司有两台服务器,一台PC服务器S1作为代理服务器实现整个公司上网,代理服务器的操作系统是Linux,代理软件是squid;另一台PC服务器S2安装了DHCP服务,为内部客户机动态分配IP地址,拓扑图如下图所示。


下面分别是服务器S1的代理服务配置文件/etc/squid/squid.conf和服务器S2的DHCP服务配置文件/etc/dhcpd.conf的主要内容。
[s1的/etc/squid/squid.conf文件的主要内容]
http_port 8080
cache mere 194 MB
cache dir/home/squid/cache 4000 24 33
cache access log/usr/local/squid/logs/access.log
cache log /usr/local/squid/logs/cache.log
dns nameservers (2)
acl denydomain dstdomain foo.com.tw
acl all scr 0.0.0.0/0.0.0.0
http access deny denydomain
http access allow all
cache_mgr netsnake@263.net
[S2服务器/etc/dhcpd.conf文件的主要内容]
subnet 192.168.1.0 netmask 255.255.255.0{
range (3)
default-lease-time 86400;
max-lease-time 604800;
option subnet-mask 255.255.255.0;
option routers 192.168.1.1;
option broadcast-address 192.168.1.255;
option domain-name-servers 202.102.192.68;
}

代理服务器缓冲区放在哪里大小是多少

答案

参考答案:

解析:/home/squid/cache、4000M代理服务器缓冲区放的位置和大小是由/etc/squid/squid.conf文件中cache_dir选项来指定的,同时该参数还可指定目录结构,定义方法是: CaChe dir <目录> <大小> <一级目录数><二级目录数> “目录”指明了该交换空间的顶级目录,“大小”定义了可用的空间总量,其单位是Mbytes。因此,在本题中,代理服务器缓沖区放在/home/squid/cache,大小为4000M。

选择题
单项选择题

Mass production, the defining characteristic of the Second Wave economy, becomes increasingly obsolete as firms install information intensive, often robotized manufacturing systems capable of endless cheap variation, even customization. The revolutionary result is, in effect, the demassification of mass production.

The shift toward smart flex techs promotes diversity and feeds consumer choice to the point that a Wal-Mart store can offer the buyer nearly 110,000 products in various types, sizes, models and colors to choose among. But Wal-Mart is a mass merchandiser. Increasingly, the mass market itself is breaking up into differentiated niches as customer needs diverge and better information makes it possible for businesses to identify and serve micro markets.

Specialty stores, boutiques, superstores, TV home-shopping systems, computer based buying, direct mail and other systems provide a growing diversity of channels through which producers can distribute their wares to customers in an increasingly demassified marketplace. When we wrote Future Shock in the late 1960s, visionary marketers began talking about "market segmentation". Today they no longer focus on " segments" but on " particles "—family units and even single individuals. Meanwhile, advertising is targeted at smaller and smaller market segments reached through increasingly demassified media.

The dramatic breakup of mass audiences is underscored by the crisis of the once great TV networks, ABC, CBS, and NBC, at a time when Tele-Communications, Inc. of Denver, announces a fiber optic network capable of providing viewers with five hundred interactive channels of television. Such systems mean that sellers will be able to target buyers with even greater precision. The simultaneous demassification of production, distribution and communication revolutionizes the economy and shifts it from homogeneity toward extreme heterogeneity.

The word "niches" in this context in Paragraph 2 means()

A. proper positions

B. various parts

C. holy recesses

D. small stores