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• While creating a network, the network offering chosen will define if the network is persistent or not 
  • This will depend on if the new flag 'isPersistent' introduced in network offering is turned on or off in the chosen network offering
• If the user chooses to make the network persistent, then along with network creation (i.e. making a db entry) the network will also be provisioned
  • Provisioning a network is network implementation i.e. allocating resources and VLAN id
• In the below mentioned scenarios a new network is created. The network that is created should be persistent if the network-offering available for the specified account is persistent, 
  1. When associateIpAddress API is called to acquire and associate a Public IP to an account that has no network
  2. When assignVirtualMachine API is called such that the account a VM is being moved to has no network 

Network updation

• An existing network can be made persistent by updating its network offering to an offering that has the IsPersistent flag set to true
  • While setting this property if the network doesn't have any running VM’s then the it will also be provisioned
• Network offering of a network is updated from a persistent network offering to a non-persistent one
  • If the network has no running VM's, during the next GC run the network will be shutdown

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