An administrator needs to configure interface ethernet1/2 on a firewall to serve as the default gateway for hosts on the 172.17.20.0/24 local network. Which IPv4 address and prefix length is valid to assign to this interface?

### Why this is right The Site B preparation instructions assign 172.17.20.1/24 to `ethernet1/2` and 172.16.20.1/24 to `ethernet1/3`. The first address is the gateway address for the Site B W1 subnet. ### The concept An interface address identifies the firewall on its connected network. The `/24` prefix is part of the assigned network configuration. The two Site B interfaces serve different subnets, so their addresses must not be swapped. ### The other options - **B. 172.16.20.1/24**: This belongs on `ethernet1/3`, which serves the other Site B network. - **C. 172.17.10.1/24**: This is not the Site B address specified in the preparation instructions. - **D. 10.xx.xx.253/24**: This represents the partner firewall's Internet interface address format used for the WAN test, not the Site B LAN interface address. ### Terms - **IPv4**: Internet Protocol version 4. A version of Internet Protocol addressing. - **WAN**: Wide Area Network. A network connecting separate sites. ### Remember On Site B, `ethernet1/2` is 172.17.20.1/24 and `ethernet1/3` is 172.16.20.1/24.