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本方案采用DHCP来分配网络地址。DHCP是 (4) 协议的一个扩展，便于客户自动从服务器获取IP地址和相关设置，其中实现IP地址动态分配的过程如下(①到④未按顺序排列)。
①客户设置服务器ID和IP地址，并发送给服务器一个DHCP Request报文。
②客户端向服务器广播DHCP Discover报文，此报文源地址为 (5) ，目标地址为 (6) 。
③服务器返回DHCP ACK报文。
④服务器返回DHCP Offer报文。
客户收到的数据包中应包含客户的 (7) 地址，后面跟着服务器能提供的IP地址、子网掩码、租约期限及DHCP服务器的 (8) 地址。客户进行ARP检测，如果觉得有问题，发送DHCP Decline报文：如果觉得没有问题，就接受这个配置参数。

答案

参考答案：(4)BOOTP协议
(5)0.0.0.0
(6)广播地址255.255.255.255
(7)MAC
(8)IP地址

填空题


SECTION A
In this section, you will hear a mini-lecture. You will hear the lecture ONCE ONLY. While listening, take notes on the important points. Your notes will not be marked, but you will need them to complete a gap-filling task after the mini-lecture. When the lecture is over, you’ll be give a two minutes to check your notes, and another 10 minutes to complete the gap-filling task.
Now listen to the mini-lecture.
Complete the gap-filling task. Some of the gaps below may require a maximum of THREE words. Make sure the word (s) you fill in is (are) both grammatically and semantically acceptable. You may refer to your notes.

Audience
Audience is a very important concept for writing.
The audience influences the content, structure, style,
etc of your writing. You need to analyze your audience
in terms of
1. Your social relations
Through writing, you are making social
(1) ______ with other members of the society.(1)______
2. Their (2)______of your subject (2)______
This analysis is particularly valuable in (3) (3)______
______writing.
3. Their (4) ______ to the subject and your(4)______
position in the writing
This analysis is extremely important in (5) ______(5)______
writing.
1) To those who agree, (6) ______ the importance (6)______
of your position;
2 ) To those who are neutral or undecided, address
their (7)______ as directly and fully as possible; (7)______
3) To whose who disagree, try to find out why
they disagree. There may be two reasons for their
disagreement:
—lack of information
—personal, poetical, or (8)______reasons(8)______
For the former, give them relevant information as
(9)______as possible.(9)______
For the latter, you need to show your (10) (10)______
of them and address them accordingly.
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单项选择题

软件工程方法是在实践中不断发展的方法，而早期的软件工程方法主要是指

A．原型化方法

B．结构化方法

C．面向对象方法

D．功能分解法
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