There is a command group 'az_network_vnet'. This group of commands could 'check if a private ip address is available for use within a virtual network'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_network_vnet_update'.The syntax is: az network vnet update [--add]
                       [--address-prefixes]
                       [--ddos-protection {0, 1, f, false, n, no, t, true, y, yes}]
                       [--ddos-protection-plan]
                       [--dns-servers]
                       [--force-string {0, 1, f, false, n, no, t, true, y, yes}]
                       [--ids]
                       [--name]
                       [--no-wait {0, 1, f, false, n, no, t, true, y, yes}]
                       [--remove]
                       [--resource-group]
                       [--set]
                       [--subscription]
                       [--vm-protection {0, 1, f, false, n, no, t, true, y, yes}]. The 1th example of the child command would be to use it to 'update a virtual network with the ip address of a dns server', the syntax is: az network vnet update -g MyResourceGroup -n MyVNet --dns-servers 10.2.0.8. The 2th example of the child command would be to use it to 'update a virtual network', the syntax is: az network vnet update --address-prefixes 40.1.0.0/24 --name MyVNet --resource-group MyResourceGroup. The 3th example of the child command would be to use it to 'update a virtual network to delete dns server', the syntax is: az network vnet update -g MyResourceGroup -n MyVNet --dns-servers null. The parameter '--add' is optional. add an object to a list of objects by specifying a path and key value pairs.  example: --add property.listproperty <key=value, string or json string>.. The parameter '--address-prefixes' is optional. space-separated list of ip address prefixes for the vnet.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. The parameter '--ddos-protection' is optional. control whether ddos protection is enabled.. The parameter '--ddos-protection-plan' is optional. name or id of a ddos protection plan to associate with the vnet.. The parameter '--dns-servers' is optional. space-separated list of dns server ip addresses.  support shorthand-syntax, json-file and yaml-file. try "??" to show more.. The parameter '--force-string' is optional. when using 'set' or 'add', preserve string literals instead of attempting to convert to json.. The parameter '--ids' is optional. one or more resource ids (space-delimited). it should be a complete resource id containing all information of 'resource id' arguments. you should provide either --ids or other 'resource id' arguments.. The parameter '--name -n' is optional. the virtual network (vnet) name.. The parameter '--no-wait' is optional. do not wait for the long-running operation to finish.. The parameter '--remove' is optional. remove a property or an element from a list.  example: --remove property.list <indextoremove> or --remove propertytoremove.. The parameter '--resource-group -g' is optional. name of resource group. you can configure the default group using `az configure --defaults group=<name>`.. The parameter '--set' is optional. update an object by specifying a property path and value to set.  example: --set property1.property2=<value>.. The parameter '--subscription' is optional. name or id of subscription. you can configure the default subscription using `az account set -s name_or_id`.. The parameter '--vm-protection' is optional. enable vm protection for all subnets in the vnet.. 