Here is a sample of the code used in the network builder. Notice the double slashes (//) before the .mtu(), hence no value is being stated so that the default is used. //Configure initial network builder with empty name field NetworkBuilder networkBuilder = new NetworkBuilder() .name(EMPTY_NETWORK_NAME) //.mtu() .dataCenter(dataCenter() .name(dcName)) .usages(netUsageList) .ip( ip() .version(IpVersion.V4) .netmask(netMask) .gateway(netGateway)) .dnsResolverConfiguration( dnsResolverConfiguration() .nameServers(dnsName));