奥鹏云南开放大学 计算机专业英语(20秋)形考作业7.doc

1.It is commonly also known as TCP/IP, named from two of the most important protocols in it: The Transmission Control Protocol and _____.

A.An identifier

B.the Internet Protocol(IP)

C.An

array D.ITP

【参考答案】: B

2.The TCP/IP model consist of____ layers.

A.three

B.six

C.four

D.two

【参考答案】: C

3.This passage is mainly talking about ______.

A.Internet Protocol Suite

B.a

control C.pipelining D.producing

【参考答案】: A

4.The functional groups of protocols and methods are________ , the Transport layer, the Internet Layer, and the Link Layer.

A.Active X

B.XML

C.HTML Layer

D.the Application Layer

【参考答案】: D

5.Most computer operating system in use today, including all consumer-targeted systems ,include a TCP/IP _____.

A.plan

B.requirement

C.implementat-ion

D.design

【参考答案】: C

6.The term "optimization" in compiler design refers to the attempts that a compiler makes to produce code that is more efficient than the obvious code. "Optimization" is thus a misnomer, since there is no way that the code produced by a compiler can be guaranteed to be as fast or faster than any other code that performs the same task.

In modern times, the optimization of code that a compiler performs has become both more important and more complex. It is more complex because processor architectures have become more complex, yielding more opportunities to improve the way code executes. It is more important because massively parallel computers require substantial optimization, or their performance suffers by orders of magnitude. With the likely prevalence of multicore machines (computers with chips that have large numbers of processors on them), all compilers will have to face the problem of taking advantage of multiprocessor machines.

It is hard, if not impossible, to build a robust compiler out of “hacks”. Thus, an extensive and useful theory has been built up around the problem of optimizing code. The use of a rigorous mathematical foundation allows us to show that an optimization is correct and that it produces the desirable effect for all possible inputs. We shall see, starting in Chapter 9, how models

such as graphs, matrices, and linear programs are necessary if the compiler is to produce well optimized code.

【参考答案】:

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