def addDUT(connection, sessionUrl, dutDict=None):
    '''
        This method is used to add a DUT resource to the active test on the given session
        Returns the id of the newly added DUT

        Args:
        - connection is the connection object that manages the HTTP data transfers between the client and the REST API
        - dutListUrl is the address that contains the list of DUTs
        - dutDict contains a comment, the name or the type of the DUT (or all three)
        DUT types::
            Firewall
            ExternalServer
            PacketSwitch
            ServerLoadBalancer
            VirtualDut
        By default, when posting using dutDict=None, dutType will be SLB
    '''
    dutListUrl = "%s/ixload/test/activeTest/dutList" % (sessionUrl)
    return performGenericPost(connection, dutListUrl, dutDict)