Ch9 System Time Exam

Two types of clocks on Linux based systems are __________ and __________ clocks.

(choose two)
- Software
- Hardware
- Firmware
- System
The system clock calculates time as number of seconds elapsed since:
- 01-Jan-1980 00:00:00
- 01-Jan-1970 00:00:00
- 01-Jan-2000 00:00:00
- The base time set at the time of installation
The reference time that the system time is calculated from is known as:
- GMT
- Epoch time
- UTC
- Base time
The system clock contains the current time, but no time zone information.

True or False?
- True
- False
The battery-powered clock, which keeps time when the system is shut down, is known as the:
- System clock
- Base clock
- Hardware clock
- Battery time
When the system boots, the system clock is set using the value of the hardware clock.

True or False?
- True
- False
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?
- 11:30:17
- Varies from time zone to time zone
- Local time
- Hardware clock will show UTC time
The ___________ command is used to update the RTC clock.
- time
- net-time
- hwclock
- clock
A software application that is dependent on both hardware and system clocks is failing. A possible reason could be:
- System clock and hardware clocks are out of sync
- There are multiple rtc files under/dev
- Time zone has changed
- Software license has expired
Which of the following commands will set the system time to the same time as the hardware clock?
- hwclock -r
- hwclock -s
- hwclock -w
- hwclock --set --date "current system time"
When the hwclock command is used to update the system clock, it refers to the ______________ file for retrieving time zone details.
- /etc/timezone
- /etc/net-time
- /etc/localtime
- /etc/update
Amount of time the hardware clock gains or loses on a regular rate is known as:
- Clock gain
- Delta time
- Clock drift
- Clock cycle change
In the last six months, the administrator had to adjust the hardware clock on three different occasions. He can find information regarding past clock values from which file?
- /dev/rtc1
- /dev/rtc0
- /etc/localtime
- /etc/adjtime
The date command is used for:
- All choices are valid
- Assigning filenames with timestamps suffixed to them in scripts
- Viewing current date and time
- Setting the system date and time
The date command can only show the time in 0-23 hour format.

True or False?
- True
- False
On RedHat-based systems, the ______________ file is used to configure the timezone of the system.
- /etc/local
- /etc/timezone
- /etc/time
- /etc/localtime
On Debian-based systems, the timezone can be set by updating the ____________ file.
- /etc/timezone
- /usr/zoneinfo
- /etc/localtimezone
- /usr/share/zone
NTP stands for:
- New Time Protocol
- New Time zone Parser
- No Testing Parameter
- Network Time Protocol
The reference time used by NTP is:
- Local time on the primary server
- CMOS clock time
- GMT + 0.5
- UTC
The precision provided by NTP is on the order of:
- 1 hour
- Tens of millionths of a second
- 1 millisecond
- 1 second
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
The /etc/ntp.conf file shows that NTP servers are being queried using iburst mode. This enables:
- Checking the closest server first
- Finding time even if the server is unreachable
- Speeding up of initial synchronization
- Sending a burst of three requests instead of one if the server is unreachable
Which of the following options, when used with the ntpd command, will perform a one time synchronization:
- -c
- -N
- -q
- -g
The main configuration file for setting up the ntpd daemon is __________.
- /etc/ntpd.rc
- /etc/ntpdconf
- /etc/ntp.conf
- /etc/ntpd.conf
The /etc/ntp.conf file lists three servers for querying. Two of them return the time 10:54:23 while the third one shows a different time (i.e. 10:50:37). The system will use which of the return values?
- It will use an average of the time
- It will use 10:50:37 if this is closer to the system’s current time
- It will use 10:54:23 since this is what the majority of servers indicate
- It will use the time of the server that was queried first
The ____________ command is used to query NTP and monitor the performance of the ntpd daemon.
- clock
- ntpq
- ntpque
- performance
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?
- Stratum-4
- It is impossible to tell by the Stratum number
- Both are equally accurate
- Stratum-2
The ____________ utility can be used for debugging and provides the trace of the chain of NTP servers to the source.
- trace
- ntptrace
- ntdebug
- debug
To verify if a NTP server is available, which of the following commands should be executed?
- ntpdate
- ntpdate -p
- ntpdate -q
- ntpdate -t
The _______________ domain is a virtual cluster of time servers providing NTP service to systems across the globe.
- pool.ntp.net
- time.com
- ntp.pool.org
- pool.ntp.org
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
Which value is returned by default when using the timedatectl command without any arguments?
- Time zone
- All listed values are returned by default
- Local time
- RTC time
All chronyc commands can be used by regular users.

True or False?
- True
- False
Chrony works well for environments which ______________.
- …have intermittent network connectivity.
- …use older hardware.
- …are in remote time zones.
- …are in large datacenters.
The /etc/chrony.conf file can specify which NTP pool to use.

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

True or False?
- True
- False

Linux II 2.21
Ch 1	Ch 6	Ch 11	Ch 16
Ch 2	Ch 7	Ch 12	Ch 17
Ch 3	Ch 8	Ch 13	Ch 18
Ch 4	Ch 9	Ch 14
Ch 5	Ch 10	Ch 15
Midterm Exam (Ch 1-8)
Final Exam (Ch 9-18)
Final Comprehensive Exam (Ch 1-18)

Linux II 2.21
Ch 1	Ch 6	Ch 11	Ch 16
Ch 2	Ch 7	Ch 12	Ch 17
Ch 3	Ch 8	Ch 13	Ch 18
Ch 4	Ch 9	Ch 14
Ch 5	Ch 10	Ch 15
Midterm Exam (Ch 1-8)
Final Exam (Ch 9-18)
Final Comprehensive Exam (Ch 1-18)

Ch9 System Time Exam

Two types of clocks on Linux based systems are __________ and __________ clocks.

(choose two)

The system clock calculates time as number of seconds elapsed since:

The reference time that the system time is calculated from is known as:

The system clock contains the current time, but no time zone information.

True or False?

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

When the system boots, the system clock is set using the value of the hardware clock.

True or False?

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?

The ___________ command is used to update the RTC clock.

A software application that is dependent on both hardware and system clocks is failing. A possible reason could be:

Which of the following commands will set the system time to the same time as the hardware clock?

When the hwclock command is used to update the system clock, it refers to the ______________ file for retrieving time zone details.

Amount of time the hardware clock gains or loses on a regular rate is known as:

In the last six months, the administrator had to adjust the hardware clock on three different occasions. He can find information regarding past clock values from which file?

The date command is used for:

The date command can only show the time in 0-23 hour format.

True or False?

On RedHat-based systems, the ______________ file is used to configure the timezone of the system.

On Debian-based systems, the timezone can be set by updating the ____________ file.

NTP stands for:

The reference time used by NTP is:

The precision provided by NTP is on the order of:

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?

The /etc/ntp.conf file shows that NTP servers are being queried using iburst mode. This enables:

Which of the following options, when used with the ntpd command, will perform a one time synchronization:

The main configuration file for setting up the ntpd daemon is __________.

The /etc/ntp.conf file lists three servers for querying. Two of them return the time 10:54:23 while the third one shows a different time (i.e. 10:50:37). The system will use which of the return values?

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

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?

The ____________ utility can be used for debugging and provides the trace of the chain of NTP servers to the source.

To verify if a NTP server is available, which of the following commands should be executed?

The _______________ domain is a virtual cluster of time servers providing NTP service to systems across the globe.

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?

Which value is returned by default when using the timedatectl command without any arguments?

All chronyc commands can be used by regular users.

True or False?

Chrony works well for environments which ______________.

The /etc/chrony.conf file can specify which NTP pool to use.

True or False?

The /etc/chrony.conf file can specify which NTP pool to use.

True or False?

Two types of clocks on Linux based systems are and clocks.

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?

When the `hwclock` command is used to update the system clock, it refers to the ______________ file for retrieving time zone details.

The `date` command is used for:

The `date` command can only show the time in 0-23 hour format.

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?

The `/etc/ntp.conf` file shows that NTP servers are being queried using `iburst` mode. This enables:

Which of the following options, when used with the `ntpd` command, will perform a one time synchronization:

The main configuration file for setting up the `ntpd` daemon is __________.

The `/etc/ntp.conf` file lists three servers for querying. Two of them return the time `10:54:23` while the third one shows a different time (i.e. `10:50:37`). The system will use which of the return values?

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

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?

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

Which value is returned by default when using the `timedatectl` command without any arguments?

All `chronyc` commands can be used by regular users.

`Chrony` works well for environments which ______________.

The `/etc/chrony.conf` file can specify which NTP pool to use.

The `/etc/chrony.conf` file can specify which NTP pool to use.