Real Time Servers

Question 1

NTP

Answer 1

Network Time Protocol

Question 2

Stratum 0

Answer 2

High-precision reference systems. Atomic, GPS, Radio

Question 3

Stratum 1

Answer 3

Takes requests for current time from lower level, uses resources to hold time.

Question 4

Stratum 2

Answer 4

Sanity checking by synchronization

Question 5

ntpd

Answer 5

Network Time Protocol Daemon. Checks upstream time servers for correct time.

Question 6

ntpdate

Answer 6

Query specified NTP server, receives time. Do not run ntpd during use.

Question 7

/etc/ntpd.conf

Answer 7

Configuration file for daemon.

Lines beginning with server indicate contact servers and options. Multiple listed for multiple options.

Question 8

ntpq

Answer 8

query ntpd daemon for information

• p: peer server
• a: IP address

Question 9

timedatectl

Answer 9

State of system configuration with NTP server can be checked.
set-ntp: sets up check.

Question 10

chronyd

Answer 10

Modern NTP daemon for systemd systems.

Question 11

/etc/chrony/chrony.conf

Answer 11

Config file similar to ntpd.conf pool of servers.

Question 12

chronyc

Answer 12

Query chronyd on upstream NTP server activity. Enters application.
In application:
activity: summarizes sources activity.
sources: lists all sources.
quit: quits application.