When hosts and servers in the same zone communicate with each other, NAT is required.

When hosts and servers are in the same zone, they typically communicate using their private IP addresses without the need for Network Address Translation (NAT). NAT is primarily used in scenarios where there is a need to map private IP addresses to a public IP address for access to external networks, such as the internet. In a local network environment, devices that are on the same subnet can communicate directly using their local IP addresses. Therefore, NAT is not necessary for communication within the same zone, making the statement false.

Other options might suggest situations where NAT could be applicable, such as in certain configurations or specific network designs. However, in general networking principles, direct communication between hosts and servers within the same local network zone does not require NAT.