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
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。