Which of the following could be an assembly lanuage instruction that would be translated into a memory-to-memory instruction for this machine?
A) ADD 10(R1), 20(R2) B) ADD(10R1), (20R2)
C) ADD R1, 10(R2), 20 D) ADD R1, 10, 20(R2)
(84) In a certain cache system, the modified cache block is written to main memory only when the block is replaced. All of the following are used to describe this policy EXCEPT
A) store-in B) write-back C) copy-back D) write-through
(85) When an amount of memory is requested that is less than the size of a page, but a full page is allocated, the r esulting waste of memory is called
A) external fragmentation B) internal fragmentation
C) inaccessible page faults D) inaccessible garbage
(86) The time that the CPU spends on a given program can be computed using all of the following expressions EXCEPT (2分)
A) (CPU clock cycles for the program)*(clock cycle time)
B) CPU clock cycles for the program
clock rate
C) (Instruction count)*CPI
clock rate
D) (CPU clock cycles for the program)*CPI
clock rate
(87) The methods used in Asynchronous Transfer Mode (ATM) are switch technology and which of the following is used to describe this mode?
A) cell exchange B) packet exchange
C) message exchange D) information exchange
(88) In a data communication system, the transport media with the widest frequency band and best reliability is the
A) telephone line B) coaxial cable
C) radio channel D) fiber optic cable
(89) Which of the following statements about the Internet is (are) true?
I. It is possible to have multiple names corresponding to the same IP address. II. All host names must be registered with an Internet-wide central registry.
A) Neither B) Ⅰ only C) Ⅱ only D) Ⅰ and Ⅱ
(90) According to the principle of CRC calculation, given a frame-bit series M =11100111 and the multiple-term formula, frame-bit series generated by the CRC G =110011, then the CRC is (2分)
A) 111101 B) 00011 C) 11010011 D) 1101001
二、论述题(两个论述题可任选其一,并只选其一,多选无效,满分30分。)
论述题 1
局域网是当前计算机网络研究与应用的一个热点,而符合IEEE 802.3标准的传统Ethenet(MAC层采用CSMA/CD方法,物理层采用 10BASE-T标准)应用最为广泛。随着网络应用的发展,以及大型信息系统与多媒体技术的应用,人们对局域网性能提出了越来越高的要求,出现了符合 100BASE-T标准的Fast Ethernet、交换局域网Switching LAN与ATM等高速局域网产品。尽管高速局域网技术发展十分迅速,但是Ethernet仍然会被广泛地使用。今后的网络应该是传统Ethernet、FastEthernet LAN与ATM共存的结构。因此,研究 Ethernet的基本工作原理、优点与缺点,讨论高速局域网络发展的趋势与特点,对我们学习和掌握局域网应用技术是十分重要的。 |
