After installing you need to enable net.tcp protocol for WCF application hosted in IIS and now you will be able to use nettcp binding.
Message Exchange Pattern in WCF
Request-ReplyRequest-Reply is the default pattern. In this pattern client send a message to WCF service and then wait for a reply even return type is void. Client wait to complete the WCF operation.
Except MSMQ all binding support this pattern.
In this pattern fault and exception get reported to client immediately.
If IsOneWay=false than it is Request-Reply.