下列（）不是网络操作系统软件。A、Windows 2000 ServerB、Net WareC、UNIXD、SQL Server

正确答案：D
解析：DOS、Windows XP、UNIX都是操作系统，属于系统软件，Word 2000是文字处理软件，属于应用软件。

正确答案：A
解析：目前局域网中主要存在以下几类网络操作系统：Windows类网络操作系统主要有 Windows NT4.0 Server、Windows 2000 Server/Advance Server，以及最新的Windows 2003 Server/ Advance Server等；NetWare类操作系统和Unix、Linux操作系统等。

正确答案：B

正确答案：D
解析：Office 2000属于应用软件。故正确答案为D。

正确答案：A

正确答案：B

正确答案：BCE
B,C,E 解析：Explanation:
B: We need to use a default instance of SQL Server in order to allow all the different clients to connect.

C: The client computers in this scenario will be running Windows 98, Novel NetWare and Apple Macintosh. SQL Server Authentication is required as these operating systems are not supported by Windows Authentication, however, the use of SQL Server Authentication is offered only for backward compatibility, hence we need to implement Mixed Mode Authentication.

E: By using specific communication protocols, and not the Multiprotocol Net-Library, performance would be better. Every extraneous protocol adds overhead.

Note: Configuring Net-Libraries has been simplified for applications using the SQL Server 2000 client connectivity components. Selecting the client protocols to be installed on the application computer must be done during setup, and selecting the server protocols to be enabled on the instance of SQL Server 2000 must be done during the SQL Server 2000 setup. No other configuration is required. Once setup, a client can connect to any instance of SQL Server 2000 by specifying the network name of the database computer and the instance name.

Note: SQL Server 2000 can operate in either Windows Authentication mode, which allows a user to connect through a Windows NT 4.0 or Windows 2000 user account; Mixed mode, which allows users to connect to an instance of SQL Server 2000 by using either Windows Authentication or SQL Server Authentication.

Furthermore, users who connect through a Windows NT 4.0 or Windows 2000 user account can make use of trusted connections in either Windows Authentication mode or Mixed mode. When a user connects to SQL Server 2000 with a nontrusted connection, SQL Server 2000 performs the authentication itself by checking if a SQL Server login account has been created and if the supplied password is correct. SQL Server Authentication is also used for backward compatibility because applications written for SQL Server 7.0 or earlier may require the use of SQL Server logins and passwords. In addition, SQL Server Authentication is required when an instance of SQL Server is running on Windows 98 because Windows Authentication mode is not supported on Windows 98.

Incorrect Answers:
A: The Multiprotocol Net-Library can only be used to connect to a default instance of SQL Server 2000 as it does not support named instances of SQL Server 2000 or server enumeration.

D: As client computers will be running Windows 98, Novel NetWare and Apple Macintosh, we cannot use Windows Authentication as these operating systems are not supported by Windows Authentication.

Note: Windows Authentication mode allows a user to connect through a Windows NT 4.0 or Windows 2000 user account and makes use of trusted connections. When a user connects to SQL Server 2000 a nontrusted connection, SQL Server 2000 performs the authentication itself by checking if a SQL Server login account has been created and if the supplied password is correct. Mixed mode allows users to connect to an instance of SQL Server 2000 by using either Windows Authentication or SQL Server Authentication.

F: The Multiprotocol Net-Library is used to support the different protocol that the clients use. This provides easy of administration. However, since unused protocols are installed, it also introduces overhead. This is not the best solution.

Note: The Multiprotocol Net-Library allows for the automatic selection of available network protocols to communicate with an instance of SQL Server 2000. This is convenient for connecting to multiple servers running different network protocols without having to reconfigure the client connection for each server. If the client and server Net-Libraries for TCP/IP Sockets, NWLink IPX/SPX, or Named Pipes are installed on the client and server, the Multiprotocol Net-Library will automatically choose the first available network protocol to establish a connection.

The Multiprotocol Net-Library can only be used to connect to a default instance of SQL Server 2000 as it does not support named instances of SQL Server 2000 or server enumeration.

正确答案：B
解析：网络操作系统(NOS)是向网络计算机提供网络通信和网络资源共享功能的操作系统。它是负责管理整个网络资源和方便网络用户的软件集合。由于网络操作系统是运行在服务器之上的，所以有时我们也把它称为服务器操作系统。网络操作系统与运行在工作站上的单用户操作系统(如Windows XP等)或多用户操作系统由于提供的服务类型不同而有差别。一般情况下，网络操作系统是以使网络相关特性最佳为目的的，如共享数据文件、软件应用及共享硬盘、打印机、调制解调器、扫描仪和传真机等。一般计算机的操作系统，如DOS和OS/2等，其目的是让用户与系统及在此操作系统上运行的各种应用之间的交互作用最佳。目前局域网中主要存在以下几类网络操作系统。(1)Windows类：Windows NT 4.0 Server、Windows Server 2008等。(2)NetWare类：NetWare操作系统仍以对网络硬件的要求较低而受到一些设备比较落后的中、小型企业，特别是学校的青睐。(3)Unix类：目前常用的Unix系统版本主要有Unix SUR 4.0、HP-UX 11.0，Sun的 Solaris 8.0等。(4)Linux类：这是一种新型的网络操作系统，它的最大特点就是源代码开放，可以免费得到许多应用程序。目前也有中文版本的Linux，如redhat(红帽子)，红旗Linux等。

正确答案：B
解析：SQLServer为数据库管理方面的软件，不是操作系统。答案为B。

正确答案：D
解析：Sybase属于网络数据库管理系统