NTP Flashcards
NTP servers with a [lower/higher] stratum are preferred.
lower
Display the status of NTP on the device:
R1# […]
show ntp status
Specify the NTP authentication key to use with the NTP server:
R1(config)# […]
ntp server ip-address key key-number
Specify an NTP trusted key:
R1(config)# […]
ntp trusted-key key-number
Create an NTP authentication key:
R1(config)# […]
ntp authentication-key key-number md5 key
Enable NTP authentication:
R1(config)# […]
ntp authenticate
Configure NTP symmetric active mode:
R1(config)# […]
ntp peer ip-address
The default stratum of the ntp master command is […].
8
Configure the device to be an NTP server:
R1(config)# […]
ntp master [stratum]
Configure the source interface of NTP messages:
R1(config)# […]
ntp source interface
NTP uses only the […] time zone.
UTC
Configure the router to update the hardware clock using NTP:
R1(config)# […]
ntp update-calendar
Show a list of configured NTP servers:
R1# […]
show ntp associations
Configure the NTP server to sync to:
R1(config)# […]
ntp server ip-address [prefer]
When an NTP server peers with another server at the same stratum level, this is called […] mode.
symmetric active
Anything above NTP stratum […] is considered unreliable and the device will not sync its time.
15
NTP servers which get their time from other NTP servers are called […].
secondary servers
NTP servers which get their time directly from reference clocks are also called […].
primary servers
NTP servers directly connected to reference clocks are stratum […]
1
Reference clocks are NTP stratum […]
0
NTP = UDP port […]
123
NTP = […] port 123
UDP
[…] = UDP port 123
NTP
The distance of an NTP server from the original reference clock is called […].
stratum
A device [can/can’t] be an NTP server and client at the same time.
can
Configure recurring daylight saving time:
R1(config)# […]
clock summer-time name recurring start end [offset]
(start and end require the week (first, last, or number), weekday, month, and time)
Configure the timezone:
R1(config)# […]
clock timezone name hours-offset [minutes-offset]
Make the hardware clock update to match the software clock’s time:
R1# […]
clock update-calendar
Make the software clock update to match the hardware clock’s time:
R1# […]
clock read-calendar
Configure the hardware clock:
R1# […]
calendar set hh:mm:ss day month year
(day and month can be reversed in order)
Configure the software clock:
R1# […]
clock set hh:mm:ss day month year
(day and month can be reversed in order)
Displays the logs of the device:
R1# […]
show logging
What is the default time source for the software clock of a Cisco device?
hardware calendar
What is the default time zone on Cisco devices?
UTC (Coordinated Universal Time)
What is the meaning of an asterisk (*) next to the time in the output of show clock?
The time is not authoritative
Display the hardware clock:
R1# […]
show calendar
Display the software clock, including the time source:
R1# […]
show clock detail
Display the software clock:
R1# […]
show clock
