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The first rule says permit. The source is 10.50.10.25/32, which is our one specific device. The destination is 0.0.0.0/0, which is anywhere. The port is 53. This perfectly allows our specific device to make outbound DNS requests. The second rule says deny. The source is 0.0.0.0/0, meaning anyone. The destination is 0.0.0.0/0, meaning anywhere. The port is 53. Reading from top to bottom, this second rule catches and blocks all other DNS traffic from any other device.
Access list outbound only permit 10.50.10.25/32 0.0.0.0/0(is mean this host in the internet) port 53 Access list outbound deny 0.0.0.0/0 0.0.0.0/0 port 53 This configuration allows outbound DNS only 10.50.10.25/32 (this host) can request.
Access list outbound permit 10.50.10.25/32 0.0.0.0/0 port 53 Access list outbound deny 0.0.0.0/0 0.0.0.0/0 port 53