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A)Unsegmented unpaged memory B)Unsegmented paged memory
C)Segmented unpaged memory D)Segmented paged memory
(67)ASCII is a 7-bit code used to represent numeric, alphabetic, and special printable characters. It also includes codes for control characters, which are
A)printable or displayable B)not printable or displayable
C)not printable but displayable D)printable but not displayable
(68)In most wide area networks, the communication subnet consists of two distinct components:transmission lines and
A)networts B)switching elements
C)computers D)data terminal equipment
(69)To accommodate the longest path allowed by 802.3,the slot time has been set to 512 bit times,or
A)0.512μs B)5.12μs
C)51.2μs D)512μs
(70)TCP(Transmission Control Protocol) was specifically designed to provide a reliable end-to-end byte stream over a(n)
A)IP address B)reliable network
C)socket D)unreliable internetwork
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二、论述题(四个论述题可任选其一,并只选其一,多选无效,满分30分)
论述题答题必须用蓝、黑色钢笔或圆珠笔写在论述题答题纸的相应位置上,否则无效。
论述题1
有一个文件系统,根目录常驻内存,如图所示。目录文件采用链接结构,假设每个目录下最多允许建立60个文件或目录(统称为下级文件)。又假设每个磁盘块最多可存放10个文件目录项:如果下级文件是目录文件,则上级目录项指向该目录文件的第一块地址;
如果下级文件是普通文件,则上级目录项指向该文件的FCB(文件控制块)地址。假设图中所示的文件目录结构中,文件或子目录按自左向右的次序建立,而符号"…"表示尚有其他文件或子目录未列出。
1.假设普通文件采用UNIX的三级索引结构,主索引表放在文件控制块中。
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