An engineer configures remote access to a router from subnet 10.139.58.0/28. Domain name, crypto keys, and SSH are configured. Which destination-router configuration permits the traffic?
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Correct answer: interface FastEthernet0/0 ip address 10.122.49.1 255.255.255.252 ip access-group 110 in ip access-list extended 110 permit tcp 10.139.58.0 0.0.0.15 host 10.122.49.1 eq 22.
Why this is the answer
The correct option uses an extended ACL (110) to permit SSH (port 22) traffic from the source subnet 10.139.58.0/28 (wildcard mask 0.0.0.15) to the router's interface IP address 10.122.49.1. The ip access-group 110 in command correctly applies the ACL to inbound traffic on the interface. The second option is incorrect because the wildcard mask 255.255.255.248 is not valid for a /28 subnet and any is used instead of the specific destination host. The third option is incorrect because a standard ACL (105) cannot filter by destination port or protocol, and the wildcard mask 0.0.0.7 is incorrect for a /28 subnet. The fourth option is incorrect because it uses a standard ACL, specifies UDP instead of TCP for SSH, and has an incorrect wildcard mask.
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