deny traffic from specific host on specific host

Question

if you please I wanna ask how to apply standard Acl on the server,to deny any communication between it and the hosts connected to Houston router.

There is no CLI in the server or hosts to write a command

Answer 1

You can use standard ACL(Access control list). Standard access list will match traffic based on source ip address or source network subnet.

Extended ACLs can match both source and destination subnet or ip address and also traffic type.

So then you can either deny or allow the traffic. For example if you want to deny traffic from server 192.168.1.11 then

R1(config)#access-list 1 deny 192.168.1.11 0.0.0.255 
R1(config)#access-list 1 permit an
R1(config)#access-list 1 permit any 
R1(config)#int fa0/0
R1(config-if)#ip access-group 1 ?
  in   inbound packets
  out  outbound packets

R1(config-if)#ip access-group 1 in 
R1(config-if)#

Remember you need an explicit permit statement at the end since you don't want traffic from other hosts to be denied as well since there is an explicit deny statement by default at the end of ACL's.

Hope it made sense to you.

You can read more about access control lists here. https://www.cisco.com/c/en/us/support/docs/security/ios-firewall/23602-confaccesslists.html