 Continuing with our discussion on cloud computing, now we are going to look at the architectures and models which are adopted in cloud computing. We are going to be very specific because instead of being generalized and following some research articles, I would refer to the ITUT recommendations, WiredRot3536, which is the standardization document which was adopted in year 2022. This helps us to make sure that we are going to look at all the possible aspects that the scientific community would have thought over because standardization documents are pretty robust. Then we are going to look at an entity called Cloud Service Broker and we are going to break down into its logical components. So, the Cloud Service Broker, which is essentially a sub-role of the cloud service network and the cloud service provider, it negotiates between the customer or the consumer and the provider. So, what does it negotiate? It facilitates or translates the requirements of services in terms of their technical functional definitions. For that, it arbitrates the services which are solicited by the customer and which are provided by the provider. It then ensures the delivery and the overall management customization and possibly alteration. The broker also helps to establish a logical independence between more than one CSPs, that is the providers for a single consumer. So, that is essentially the responsibility of an intermediary known as the broker. The logical components of the broker could be as simple as in the workspace, which is the customer premises equipment, the product catalog or the listing of all the services which are available on the provider's side. Then, if there's a need for initiating a service, a contract has to be established between the two entities and then the service is accessed and the service is managed. The entire service delivery lifecycle is what the broker primarily looks into. Now, we are going to look at the standardization definition of all these components which are defined in more detail in y.3506. So, we have the workspace. In the workspace, we would have user authentication and authorization which is the first thing to do and then the account creation, account management, both for the consumers as well as the providers because the cloud network is going to provide the service not only to the consumers but also to the providers who are interested in offering different types of services over a publicly available cloud. Then, the user interfaces both for the consumer as well as for provider are defined here in the workspace, which would include the provision of searching for a particular type of service, selecting a service, managing and paying for that particular service. From the provider end, likewise, it's going to be the offering of certain range of services by a certain provider which has to get these registered. Then, we have the product catalog that is the range and the array of services. For that, the cloud has to ensure through the broker that the services are properly registered and if these services are utilized or have reached their maturity or their business life cycle, then these services have to be re-registered and denotified. Then, correspondingly, the product catalog also has to make sure that some new services are able to be enlisted over the broker and then the services have to be offered by the provider to the consumer in the form of a standardized template agreeable to all. Then, these cloud services have to be ensured by the provider as well as the consumer that the template actually has been adhered to. Then, of course, the search and then the best fit and if there is a need to alter the service in the wake of mobility, for example, that has to be provided. Then, the contract which is an essentially a very important component of the broker. So, contract essentially includes the particular service type and service category based charging and then the configuration of the cloud service by picking up the essential elements which would fit into the contract. Then, the service level agreement which is actually the service level objectives in the jargon of cloud computing. Then, the service agreement document management that is a copy of it has to be provided to CSP, the provider, the consumer and the network. Then, the description or the schema of the particular type of service level document which has to be agreed upon by the three entities and if there is what if situation if the smooth execution of service is not met then the failover or the backup actions have to be initiated. Then, we have the access management. Essentially, this would involve the delivering of cloud services upon a request and then the service would actually be activated on the cloud. So, the resources have to be activated on a CSP. Then, the information is shared between the consumers by the providers and then the once the service has been provisioned or if there is let's say a shortage of let's say revenue or the pre-registered payment at the consumer end. If that is found to be less then correspondingly the prohibition of a service once the consumer hasn't paid for it. Then last but not the least the service management. Service management would involve a plethora of activities which would involve the service monitoring and the delivery of services and the change of services if the consumer makes a request to alter the service and then the validation of results. For example, if a service has been properly executed, if it has been run successfully or it has erred or if it is being under provisioned or being over provisioned, then some kind of validation or acknowledgement mechanism, then periodic maintenance or the checking and then the entire historical or the temporal chronological track record of the services which have been running and then the sharing of summarized information with the consumer as well as the provider and again the anomaly detection and anomaly address and then once the service has been properly concluded the closure of the service and if the service is not meant to be provided to the user let's say due to the shortage of funds then the service has to be prevented to be provided by the provider. Now the reference again is a standard document it is ITUT y.3536 it was very recently published but it is being enforced.