Question

states that message passing is both time- and space-coupled – that is, messages are both directed towards a particular entity and require the receiver to be present at the time of the message send. Consider the case, though, where messages are directed towards a name rather than an address and this name is resolved using DNS. Does such a system exhibit the same level of indirection?

Answer 1

No, such system does not exhibit the same level of indirection. because, when it comes to message passing approach, both sender and receiver must be available at the same time, i.e. it inherits the feature of relative coupling where the sender and receiver has to process at the same time and has to be present. In case of address, if the receiver is unresponsive, still sender can send the request to the server and whenever the server gets activated it will send the response to the request after authentication is done.

The message passing is both space as well as time coupled. If can’t pass a data until and unless the receiver is also present. This can’t be a one-way communication like DNS resolve or sending message through Outlook. Here, in these types of message passing, the message can be passed if and only if both sender and receiver are online at the same time.

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