acl
conf t
interface GigabitEthernet0/2
ip access-group in_block in
exit
!
ip access-list extended in_block
deny udp any any eq ntp log
permit udp host 91.1.1.1 host 91.1.1.3 eq domain
permit udp host 91.1.1.1 host 91.1.1.13 eq domain
permit tcp host 91.1.1.1 any
permit icmp host 91.1.1.1 any
!
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