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FILL BLANK - Which option in the /etc/ntp.conf file specifies an external NTP source to be queried for time information? (Specify only the option without any values or parameters.)
# Specify one or more NTP servers. <- <- <- <- They are servers
# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
pool 0.ubuntu.pool.ntp.org iburst
pool 1.ubuntu.pool.ntp.org iburst
pool 2.ubuntu.pool.ntp.org iburst
pool 3.ubuntu.pool.ntp.org iburst
Answer is server
"server 0.centos.pool.ntp.org iburst"
https://learning.lpi.org/en/learning-materials/102-500/108/108.1/108.1_02/#:~:text=server%200.centos.pool.ntp.org%20iburst
It is either pool or server.
What is the difference?
pool is more of the improved version of server because:
- 'server' resolved DNS only during the initial connection.
- 'server' would continue using the initial, replied DNS (IP Addressses)
- The DNS could be dead, but 'server' would keep contacting it again until it was restarted.
Pool allowed IP addresses to be added dynamically on the fly, so if one dies, it can switch to another one. Pool allows several servers to be queried successfully (for redundancy).
https://kb.meinbergglobal.com/kb/time_sync/ntp/configuration/ntp_pool_usage
The magic of the pool mechanism is in round-robin DNS: as ntpd resolves the pool name through DNS, the response from the DNS query is a single node, which may be different every time resolution is asked. Unless the question is more specified "server" and "pool" are both correct. Personally I would chose the newer, better "pool" command though.
"The pool scheme is configured using one or more pool commands with DNS names indicating the pool from which to draw. The pool command can be used more than once; duplicate servers are detected and discarded. In principle, it is possible to use a configuration file containing a single line pool pool.ntp.org. The NTP Pool Project offers instructions on using the pool with the server command, which is suboptimal but works with older versions of ntpd predating the pool command. With recent ntpd, consider replacing the multiple server commands in their example with a single pool command."
in ubuntu I've found pool ... but on all examples they use server
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