During a network expansion, a network administrator configures a new workstation, Host B$,$ with the following IP configuration to join the existing subnet of $10\mathrm{.}0\mathrm{.}0\mathrm{.}0/24$: IP Address: $10\mathrm{.}0\mathrm{.}0\mathrm{.}256$ Subnet Mask: $255\mathrm{.}255\mathrm{.}255\mathrm{.}0$ Default Gateway: $10\mathrm{.}0\mathrm{.}0\mathrm{.}1$ However, Host B fails to communicate with any other devices on the network. What is the primary reason for this failure?