阅读以下说明,回答问题1至问题8。 [说明] Linux 系统开机引导时首先启动内核,由内核检查和初始化硬件设备,载入设备的驱动程序模块,安装root文件系统,然后内核将启动一个名为init的进程。在init运行完成并启动其他必要的后续进程后,

admin2008-02-15  37

问题 阅读以下说明,回答问题1至问题8。
   [说明]
   Linux 系统开机引导时首先启动内核,由内核检查和初始化硬件设备,载入设备的驱动程序模块,安装root文件系统,然后内核将启动一个名为init的进程。在init运行完成并启动其他必要的后续进程后,系统开始运行,引导过程结束。init进程启动时需要读取inittab配置文件,该文件确定init在系统启动和关机时的工作特性。典型的inittab文件内容见以下清单:
   #
   # inittab    This file describes how the INIT process should set up
   #            the system in a certain nm-level.
   #


   # Default nmlevel. The nmlevels used by RHS are:
   #   0 - halt (Do NOT set initdefault to this )
   #   1 - Single user mode
   #   2-Multiuser, without NFS (The same as 3, if you do not have networking)
   #   3 - Full multiuser mode
   #   4 - unused
   #   5-Xll
   #   6 - reboot (Do NOT set initdefault to this )
   #
   id:5:initdefault:


   # System initialization.
    si::sysinit:/etc/rc.d/rc.sysinit


   10:0:wait:/etc/rc.d/rc 0
   11:1:wait:/ete/rc.d/rc 1
   12:2:wait:/etc/rc.d/rc 2
   13:3:wait:/etc/rc,d/rc 3
   14:4:wait:/etc/rc.d/rc 4
   15:5:wait:/etc/rc.d/rc 5
   16:6:wait:/etc/rc.d/rc 6


   # Trap CTRL-ALT-DELETE
   ea::ctrlaltdel:/sbin/shutdown -t3 -r now


   # When our UPS tells us power has failed, assume we have a few minutes
   # of power left.  Schedule a shutdown for 2 minutes from now.
   # This does, of course, assume you have powerd installed and your
   # UPS connected and working correctly.
   pf::power fail:/sbin/shutdown -f-h +2 "Power Failure: System Shutting Down"


   # If power was restored before the shutdown kicked in, cancel it.
   pr: 12345:powerokwait:/sbin/shutdown-c "Power Restored; Shutdown Cancelled"


   # Run gettys in standard rtmlevels
   1:2345 :respawn:/sbin/mingetty tty1
   2:2345:respawn:/sbin/mingetty try2
   3:2345 :respawn:/sbin/mingetty try3
   4:2345:respawn:/sbin/mingetty tty4
   5:2345:respawn:/sbin/mingetty tty5
   6:2345 :respawn:/sbin/mingetty tty6


   # Run xdm in runlevel 5
   x:5:respawn:/etc/X 11/prefdm -nodaemon

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答案D

解析 Linux系统开机引导时首先启动内核(由LILO或GRUB引导),由内核检查和初始化硬件设备(包括内存),载入设备的驱动程序模块,安装root文件系统。网络服务进程一般由init进程的子进程rc米启动。因此启动init进程前,不会启动网络支持服务。
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