题目内容

如图3-4所示为在一台主机上用Sniffer捕捉的数据包，其中数据包标号[No.]为“7”的条目中[Summary]栏中的部分信息被隐去。请根据图3-4显示的信息回答下列问题：
(1) 该主机正在访问的WWW服务器IP地址是 (16) 。
(2)根据图3-4中[No.]栏中标号，表示TCP连接3次握手过程开始的数据包的标号是 (17) 。
(3)标号为“7”的数据包的源端口号应为 (18) ，该数据包TCPFlag的ACK位应 (19) 。
(4)标号为“7”的数
16.

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？Read the text below about how to order products.
？In most of the lines (41-52) there is one extra word. It is either grammatically incorrect or does not fit in with the sense of the text. Some lines, however, are correct.
？If a line is correct, write CORRECT on your Answer Sheet.
？If there is an extra word in the line, write the extra word in CAPITAL LETTERS on your Answer Sheet.
Special Products Co.—How to Order
Our specialty is our convenient catalogue system. Instead of spending time going to a shop, you simply order with it directly from us.
41．Ordering is easy and delivery fast. Once received, your order will
42．normally be dispatched within 72 hours. We will inform. to you
43．immediately should any items be out of stock. If you are not happy
44．with your purchases please return them to us within the 15 days in their
45．original packaging and we will return you for in full. Quality is our main
46．criterion. Each item is under unconditionally guaranteed for 6 months.
47．You will receive a receipt and with your order which is your guarantee.
48．In the unlikely event of damage to an item during delivery, should please
49．contact with us immediately on 56513726 and we will arrange for
50．its return or replacement.
51．All prices and promotional
52．offers are valid until 30th September.
(41)

Scholars and the government officials turned to the System for the purpose of seeking support of one another.

根据网络拓扑和要求，完成路由器R2上的静态路由配置。
R2(eonfig)ip route(5)255．255．255．0 192．168．1．1
R2(eonfig)ip mute 10．10．30．0 255．255．255．0(6)
R2(config)ip route 10．10．10．0 255．255．255．0 192．168．2．2

在网络B中，除PC5计算机以外，其他的计算机都能访问网络A的www服务器，而PC5计算机与网络B内部的其它Pc机器都是连通的。分别在PC5和PC6上执行命令ipcon-fig，结果信息如图6—9和图6—10所示：
请问PC5的故障原因是什么？如何解决？