問題文
An interface has an address and the default route is present, but a host on another subnet is unreachable while hosts on the local subnet respond. Which check comes first?
選択肢
- Verify that the gateway address in the default route is reachable from this host, since traffic to other subnets depends on it.
- Verify the name resolution configuration, since reaching another subnet requires resolving the remote host's name, and a lookup that fails leaves the remote host unreachable while local hosts answer.
- Verify the interface's transmission unit size, because packets crossing a subnet boundary are always fragmented and a mismatched unit size therefore blocks all traffic to other subnets while leaving local traffic unaffected.
- Verify that the local subnet mask matches the remote host's mask, and a mismatch makes the host treat the remote address as local and skip the gateway.