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IBM

000-221 · Question #9

An administrator notices that the ntp group subsystem is not starting up at boot time. What will cause this issue?

The correct answer is D. The /etc/rc.tcpip file has the following line commented out. In AIX, TCP/IP subsystems including NTP are launched at boot by /etc/rc.tcpip, so commenting out the NTP startup line in that file prevents the ntp group subsystem from starting.

Troubleshooting and Problem Determination

Question

An administrator notices that the ntp group subsystem is not starting up at boot time. What will cause this issue?

Options

  • AThe /etc/ntp.conf file has the following line commented out broadcastserver
  • BThe following line is commented outinthe/etc/inetd.conf file:
  • CThe following line is commented out of the /etc/inittab file:
  • DThe /etc/rc.tcpip file has the following line commented out:

How the community answered

(22 responses)
  • A
    9% (2)
  • B
    5% (1)
  • C
    5% (1)
  • D
    82% (18)

Why each option

In AIX, TCP/IP subsystems including NTP are launched at boot by /etc/rc.tcpip, so commenting out the NTP startup line in that file prevents the ntp group subsystem from starting.

AThe /etc/ntp.conf file has the following line commented out broadcastserver

Commenting out broadcastserver in /etc/ntp.conf affects NTP broadcast mode behavior but does not prevent the NTP daemon process itself from starting.

BThe following line is commented outinthe/etc/inetd.conf file:

The /etc/inetd.conf file controls services managed by the inetd super-server and has no role in governing the NTP daemon startup.

CThe following line is commented out of the /etc/inittab file:

Commenting out the relevant entry in /etc/inittab would prevent the entire TCP/IP initialization script from running, causing all TCP/IP services to fail rather than just NTP.

DThe /etc/rc.tcpip file has the following line commented out:Correct

The /etc/rc.tcpip script is executed during the TCP/IP initialization phase of AIX boot and contains individual lines that start each TCP/IP subsystem, including ntpd. If the line invoking NTP is commented out in /etc/rc.tcpip, the ntp subsystem will not be started at boot time. This script is the standard mechanism AIX uses to control which TCP/IP daemons are activated automatically on startup.

Concept tested: AIX NTP subsystem boot startup via rc.tcpip

Source: https://www.ibm.com/docs/en/aix/7.3?topic=files-rctcpip-file

Topics

#NTP subsystem#rc.tcpip#boot startup#subsystem configuration

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