CH 9-System Time

Question 1

/etc/chrony.conf

Answer 1

The configuration file that controls chronyd.

Question 2

/etc/ntp.conf

Answer 2

The configuration file for setting up the ntpd daemon as either an NTP client or server. The NTP package provides a default configuration which makes the system behave as a NTP client. If the system has access to the Internet, this file should be configured automatically to use three NTP servers from the ntp.org domain.

Question 3

chronyc

Answer 3

the chronyc program is used to interface with chronyd via the command line.

Question 4

hwclock

Answer 4

Command used by the root user to update and query the hardware clock.

Question 5

ntpd

Answer 5

The NTP daemon that sets and updates the system time in synchronization with one or more reference time servers. This demon sends messages to and receives messages from preconfigured servers at certain intervals.

Question 6

pool.ntp.org

Answer 6

The pool.ntp.org domain is a virtual cluster of time servers providing NTP service to systems across the globe. The default server entries in the /etc/ntp.conf file refer to a set of servers which are randomly updated every hour.

Question 7

timedatectl

Answer 7

Systems using systemd as their init-system use the timedatectl command to view and control time on the system. Running the timedatectl command without any arguments shows the current time and the time settings for the system.

Question 8

The battery-powered clock, which keeps time when the system is shut down, is known as the:
Hardware clock
System clock
Base clock
Battery time

Answer 8

Hardware clock

Question 9

When the Linux computer was shut down, the system clock indicated 11:30:17. What will be the time of the hardware clock immediately after shutdown?
Hardware clock will show UTC time
Local time
11:30:17
Varies from time zone to time zone

Answer 9

11:30:17

Question 10

The date command can only show the time in 0-23 hour format.
True or False?
True
False

Answer 10

False

Question 11

The precision provided by NTP is on the order of:
1 millisecond
1 second
1 hour
Tens of millionths of a second

Answer 11

Tens of millionths of a second

Question 12

Instead of running ntpd as a daemon, the administrator wants to run it as a foreground process. Which of the following options should be used?
-c
-q
-g
-n

Answer 12

-n

Question 13

The ____________ command is used to query NTP and monitor the performance of the ntpd daemon.
ntpq
clock
performance
ntpque

Answer 13

ntpq

Question 14

Two NTP servers are used by ntpd; one runs Stratum-2 clock while the other uses Stratum-4. Which one is considered to be more accurate?
Both are equally accurate
Stratum-2
Stratum-4
It is impossible to tell by the Stratum number

Answer 14

Stratum-2

Question 15

The _______________ domain is a virtual cluster of time servers providing NTP service to systems across the globe.
ntp.pool.org
time.com
pool.ntp.org
pool.ntp.net

Answer 15

pool.ntp.org

Question 16

The timesync-status argument is used with the timedatectl command to show the current status of synchronization with the NTP time source.
True or False?
True
False

Answer 16

True

Question 17

The /etc/chrony.conf file can specify which NTP pool to use.
True or False?
True
False

Answer 17

True