| Question 1 |
How often do NTP servers advertise on the network?
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| A1: |
Answer D is correct because NTP servers advertise every 64 seconds. This obviously makes A, B, and C incorrect. |
| Question 2 |
You are configuring an NTP client. Which template file will you copy to become your configuration file?
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| A2: |
Answer B is correct because /etc/inet/ntp.client is the template file that you would copy to create the configuration file. Answer A is incorrect because /etc/inet/ntp.keys is the file used to contain authentication entries and is not a template file for NTP client configuration. Answer C is incorrect because /var/ntp/ntp.drift is the default location for the drift file. Answer D is incorrect because the /etc/inet/ntp.conf file is the location of the configuration file, that is, where the template file is copied to, by default. This file does not exist until the correct template file is copied to create it. |
| Question 3 |
Which of the following are valid uses for NTP? Choose 2.
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| A3: |
Answers A and B are correct because a billing system might be charging customers by the second (or less) and needs to be very accurate. Also, NTP is used in encryption because the timestamp is often used as part of the key to encrypt a message. Answers C and D are incorrect because they are not time-critical applications and do not rely on accurate clocks as part of their functionality. |
| Question 4 |
What is the name of the NTP daemon that runs on NTP servers and clients?
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| A4: |
Answer C is correct because xntpd is the daemon process that controls NTP. Answer A is incorrect because ntpq is a utility used to query NTP servers. Answer B is incorrect because xntpdc is a utility used to query the xntpd daemon. Answer D is incorrect because /etc/init.d/xntpd is the startup script that starts and stops xntpd. |
| Question 5 |
On a running NTP server, which file would you edit to change the location of the drift file?
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| A5: |
Answer B is correct because the file /etc/inet/ntp.conf is the configuration file that is created when the NTP server is initially configured and contains an entry that defines the drift file's location. Of course, after changing the file, the NTP server would have to be restarted. Answer A is incorrect because /etc/inet/ntp.server is the template file that is copied to /etc/inet/ntp.conf to configure an NTP server. Answer C is incorrect because /var/ntp/ntp.drift is the default location for the drift file, which is specified in the configuration file. Answer D is incorrect because /etc/inet/ntp.client is the template file that is copied to /etc/inet/ntp.conf to configure an NTP client. |
| Question 6 |
At which run level does NTP get started?
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| A6: |
Answer C is correct because NTP is started at run level 2. The startup script is located in /etc/rc2.d/S74xntpd. |
| Question 7 |
Which command is used to query the NTP process and can also turn on the debugging facility?
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| A7: |
Answer B is correct because the xntpdc command is used to query the NTP daemon process, xntpd. Answer A is incorrect because the ntpq command is used to query an NTP server, not the running daemon process for a particular server. Answer C is incorrect because xntpd is the NTP daemon process that is queried when you run xntpdc. Answer D is incorrect because ntpdate is used by an NTP client to initially obtain the time from an NTP server when the client starts up. |
| Question 8 |
There are four NTP servers present on your network, and each is configured with a different stratum level between 1 and 4. Which stratum level is deemed the most reliable?
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| A8: |
Answer A is correct because the lower the stratum level, the more reliable the clock. Stratum level 0 servers are normally reference sources, such as a GPS signal. A stratum level 1 server would normally be directly connected to a reference source. |
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