設定ファイルは編集したが反映のさせかたが不明

$ cd /etc/systemd
$ sudo mv resolved.conf{,.orig}
$ sudo cp resolved.conf{.orig,}
$ diff -u resolved.conf{,.orig}
--- resolved.conf 2018-09-23 17:00:38.891952317 -1000
+++ resolved.conf.orig 2018-07-20 07:13:58.000000000 -1000
@@ -12,9 +12,9 @@
# See resolved.conf(5) for details

[Resolve]
-DNS=8.8.8.8
-FallbackDNS=1.1.1.1
-Domains=zunda.ninja
+#DNS=
+#FallbackDNS=
+#Domains=
#LLMNR=no
#MulticastDNS=no
#DNSSEC=no