for Centos 7, chrony is used in place of ntp.
comparing chrony vs ntp, >>> http://chrony.tuxfamily.org/manual.html#Other-time-synchronisation-packages

to check what files chrony package installed,

rpm -ql chrony

[root@localhost ~]# rpm -ql chrony
/etc/NetworkManager/dispatcher.d/20-chrony
/etc/chrony.conf
/etc/chrony.keys
/etc/dhcp/dhclient.d/chrony.sh
/etc/logrotate.d/chrony
/usr/bin/chronyc
/usr/lib/systemd/ntp-units.d/50-chronyd.list
/usr/lib/systemd/system/chrony-wait.service
/usr/lib/systemd/system/chronyd.service
/usr/libexec/chrony-helper
/usr/sbin/chronyd
/usr/share/doc/chrony-1.29.1
/usr/share/doc/chrony-1.29.1/COPYING
/usr/share/doc/chrony-1.29.1/NEWS
/usr/share/doc/chrony-1.29.1/README
/usr/share/doc/chrony-1.29.1/chrony.conf.example
/usr/share/doc/chrony-1.29.1/chrony.conf.example2
/usr/share/doc/chrony-1.29.1/chrony.keys.example
/usr/share/doc/chrony-1.29.1/chrony.txt
/usr/share/doc/chrony-1.29.1/faq.txt
/usr/share/info/chrony.info.gz
/usr/share/man/man1/chrony.1.gz
/usr/share/man/man1/chronyc.1.gz
/usr/share/man/man5/chrony.conf.5.gz
/usr/share/man/man8/chronyd.8.gz
/var/lib/chrony
/var/lib/chrony/drift
/var/lib/chrony/rtc
/var/log/chrony