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Description of problem: 

b.root.server's ip address has been changed.

https://www.internic.net/domain/named.root
-----------------------------8<-----------------------------
B.ROOT-SERVERS.NET.      3600000      A     199.9.14.201
B.ROOT-SERVERS.NET.      3600000      AAAA  2001:500:200::b
-----------------------------8<-----------------------------

named.ca file in the bind-9.9.4-51.el7_4.1.x86_64.rpm is old.
-----------------------------8<-----------------------------
b.root-servers.net.	3600000	IN	A	192.228.79.201
b.root-servers.net.	3600000	IN	AAAA	2001:500:84::b
-----------------------------8<-----------------------------

*** Bug 1624905 has been marked as a duplicate of this bug. ***

*** Bug 1665926 has been marked as a duplicate of this bug. ***

This bug was reported over a year ago, the old IP addresses of B-root are now no longer in use and generating delays/errors.

The fix is very easy:
wget -O /var/named/named.ca http://www.internic.net/domain/named.root

*** Bug 1670068 has been marked as a duplicate of this bug. ***

Fixed already in rebased version

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:2057