diff --git a/conftest.py b/conftest.py
index 9cce6b952..808522f5e 100644
--- a/conftest.py
+++ b/conftest.py
@@ -14,8 +14,11 @@
 #
 
 from f5.bigip import BigIP
+import mock
 import pytest
 
+from icontrol.session import iControlRESTSession
+
 
 def pytest_addoption(parser):
     parser.addoption("--bigip", action="store",
@@ -33,6 +36,19 @@ def pytest_addoption(parser):
                      default='11.6.0')
 
 
+@pytest.fixture
+def fakeicontrolsession(monkeypatch):
+    class Response(object):
+        def json(self):
+            return {'selfLink': 'https://localhost/mgmt/tm/sys?ver=11.6.0'}
+    fakesessionclass = mock.create_autospec(iControlRESTSession, spec_set=True)
+    fakesessioninstance =\
+        mock.create_autospec(iControlRESTSession('A', 'B'), spec_set=True)
+    fakesessioninstance.get = mock.MagicMock(return_value=Response())
+    fakesessionclass.return_value = fakesessioninstance
+    monkeypatch.setattr('f5.bigip.iControlRESTSession', fakesessionclass)
+
+
 @pytest.fixture
 def opt_bigip(request):
     return request.config.getoption("--bigip")
diff --git a/f5/bigip/__init__.py b/f5/bigip/__init__.py
index 49dd1386d..98a45c198 100644
--- a/f5/bigip/__init__.py
+++ b/f5/bigip/__init__.py
@@ -18,6 +18,9 @@
 
 
 from icontrol.session import iControlRESTSession
+from urlparse import parse_qs
+from urlparse import urlparse
+
 
 from f5.bigip.cm import Cm
 from f5.bigip.resource import PathElement
@@ -54,8 +57,10 @@ def __init__(self, hostname, username, password, **kwargs):
             'bigip': self,
             'icontrol_version': icontrol_version,
             'username': username,
-            'password': password
+            'password': password,
+            'tmos_version': None,
         }
+        self._get_tmos_version()
 
     @property
     def hostname(self):
@@ -65,6 +70,18 @@ def hostname(self):
     def icontrol_version(self):
         return self._meta_data['icontrol_version']
 
+    @property
+    def tmos_version(self):
+        return self._meta_data['tmos_version']
+
+    def _get_tmos_version(self):
+        connect = self._meta_data['bigip']._meta_data['icr_session']
+        base_uri = self._meta_data['uri'] + 'tm/sys/'
+        response = connect.get(base_uri)
+        ver = response.json()
+        version = parse_qs(urlparse(ver['selfLink']).query)['ver'][0]
+        self._meta_data['tmos_version'] = version
+
 
 class BigIP(ManagementRoot):
     """A shim class used to access the default config resources in 'mgmt/tm.'
diff --git a/f5/bigip/cm/autodeploy/test/test_software_image_uploads.py b/f5/bigip/cm/autodeploy/test/test_software_image_uploads.py
index f9a6865f9..3becf5221 100644
--- a/f5/bigip/cm/autodeploy/test/test_software_image_uploads.py
+++ b/f5/bigip/cm/autodeploy/test/test_software_image_uploads.py
@@ -24,7 +24,7 @@
 CHUNKSIZE = 20
 
 
-def test_software_image_uploads_80a(tmpdir):
+def test_software_image_uploads_80a(tmpdir, fakeicontrolsession):
     filepath = tmpdir.mkdir('testdir').join('eightya.iso')
     filepath.write(80*'a')
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
@@ -37,7 +37,7 @@ def test_software_image_uploads_80a(tmpdir):
         assert d == 'a'*CHUNKSIZE
 
 
-def test_software_image_uploads_70a(tmpdir):
+def test_software_image_uploads_70a(tmpdir, fakeicontrolsession):
     filepath = tmpdir.mkdir('testdir').join('seventya.iso')
     filepath.write(70*'a')
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
@@ -53,7 +53,7 @@ def test_software_image_uploads_70a(tmpdir):
     assert 10*'a' == lchunk
 
 
-def test_non_ISO_extension(tmpdir):
+def test_non_ISO_extension(tmpdir, fakeicontrolsession):
     filepath = tmpdir.mkdir('testdir').join('wrong.name')
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
     sius = mr.cm.autodeploy.software_image_uploads
diff --git a/f5/bigip/mixins.py b/f5/bigip/mixins.py
index 596dde495..635eb56f2 100644
--- a/f5/bigip/mixins.py
+++ b/f5/bigip/mixins.py
@@ -31,6 +31,14 @@ class UnsupportedMethod(F5SDKError):
     pass
 
 
+class UnsupportedTmosVersion(F5SDKError):
+    """Raise the error if a class of an API is instantiated,
+
+    on a TMOS version where API was not yet implemented/supported.
+    """
+    pass
+
+
 class LazyAttributesRequired(F5SDKError):
     """Raised when a object accesses a lazy attribute that is not listed"""
     pass
@@ -101,10 +109,20 @@ def __getattr__(container, name):
             if name == lazy_attribute.__name__.lower():
                 attribute = lazy_attribute(container)
                 bases = [base.__name__ for base in lazy_attribute.__bases__]
+                # Doing version check per each resource
+                container._check_supported_versions(attribute)
                 if 'Resource' not in bases:
                     setattr(container, name, attribute)
                 return attribute
 
+    def _check_supported_versions(container, attribute):
+        tmos_v = container._meta_data['bigip'].tmos_version
+        if tmos_v not in attribute._meta_data['supported_versions']:
+            error = "There was an attempt to access API which " \
+                    "has not been implemented or supported " \
+                    "in the device's TMOS version: {}".format(tmos_v)
+            raise UnsupportedTmosVersion(error)
+
 
 class ExclusiveAttributesMixin(object):
     """Overrides ``__setattr__`` to remove exclusive attrs from the object."""
diff --git a/f5/bigip/resource.py b/f5/bigip/resource.py
index d81b554fa..f97f2fab0 100644
--- a/f5/bigip/resource.py
+++ b/f5/bigip/resource.py
@@ -162,6 +162,7 @@ class PathElement(LazyAttributeMixin):
     those elements and does not support any of the CURDLE methods that
     the other objects do.
     """
+
     def __init__(self, container):
         self._meta_data = {
             'container': container,
@@ -170,6 +171,9 @@ def __init__(self, container):
             'icontrol_version': container._meta_data['icontrol_version']
         }
         self._set_meta_data_uri()
+        # Supported versions for each class will be defined here.
+        # List can be modified downstream in each sub-class
+        self._meta_data['supported_versions'] = set(['11.6.0', '12.0.0'])
 
     def _set_meta_data_uri(self):
         base_uri = self.__class__.__name__.lower()
diff --git a/f5/bigip/shared/test/test_file_uploads.py b/f5/bigip/shared/test/test_file_uploads.py
index ef336f6e3..7cf82a48b 100644
--- a/f5/bigip/shared/test/test_file_uploads.py
+++ b/f5/bigip/shared/test/test_file_uploads.py
@@ -22,7 +22,7 @@
     FileMustNotHaveDotISOExtension
 
 
-def test_file_upload_80a(tmpdir):
+def test_file_upload_80a(tmpdir, fakeicontrolsession):
     filepath = tmpdir.mkdir('testdir').join('eightya.txt')
     filepath.write(80*'a')
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
@@ -35,7 +35,7 @@ def test_file_upload_80a(tmpdir):
         assert d == 'aaaaaaaaaaaaaaaaaaaa'
 
 
-def test_file_upload_70a(tmpdir):
+def test_file_upload_70a(tmpdir, fakeicontrolsession):
     filepath = tmpdir.mkdir('testdir').join('seventya.txt')
     filepath.write(70*'a')
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
@@ -51,7 +51,7 @@ def test_file_upload_70a(tmpdir):
     assert 10*'a' == lchunk
 
 
-def test_ISO_extension(tmpdir):
+def test_ISO_extension(tmpdir, fakeicontrolsession):
     filepath = tmpdir.mkdir('testdir').join('wrongname.iso')
     filepath.write('fake')
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
@@ -61,7 +61,7 @@ def test_ISO_extension(tmpdir):
     assert EIO.value.message == 'wrongname.iso'
 
 
-def test_stringio_upload_80a(tmpdir):
+def test_stringio_upload_80a(tmpdir, fakeicontrolsession):
     sio = StringIO(80*'a')
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
     mr._meta_data['icr_session'] = mock.MagicMock()
@@ -73,7 +73,7 @@ def test_stringio_upload_80a(tmpdir):
         assert d == 'aaaaaaaaaaaaaaaaaaaa'
 
 
-def test_stringio_upload_70a(tmpdir):
+def test_stringio_upload_70a(tmpdir, fakeicontrolsession):
     sio = StringIO(70*'a')
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
     mr._meta_data['icr_session'] = mock.MagicMock()
@@ -87,7 +87,7 @@ def test_stringio_upload_70a(tmpdir):
     assert 10*'a' == lchunk
 
 
-def test_bytes_upload_80a(tmpdir):
+def test_bytes_upload_80a(tmpdir, fakeicontrolsession):
     bytestring80a = 80*'a'
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
     mr._meta_data['icr_session'] = mock.MagicMock()
@@ -99,7 +99,7 @@ def test_bytes_upload_80a(tmpdir):
         assert d == 'aaaaaaaaaaaaaaaaaaaa'
 
 
-def test_bytes_upload_70a(tmpdir):
+def test_bytes_upload_70a(tmpdir, fakeicontrolsession):
     bytestring70a = 70*'a'
     mr = ManagementRoot('FAKENETLOC', 'FAKENAME', 'FAKEPASSWORD')
     mr._meta_data['icr_session'] = mock.MagicMock()
diff --git a/f5/bigip/test/test___init__.py b/f5/bigip/test/test___init__.py
index 790f17b26..ff3812f29 100644
--- a/f5/bigip/test/test___init__.py
+++ b/f5/bigip/test/test___init__.py
@@ -26,14 +26,14 @@
 
 
 @pytest.fixture
-def FakeBigIP():
+def FakeBigIP(fakeicontrolsession):
     FBIP = BigIP('FakeHostName', 'admin', 'admin')
     FBIP.icontrol = mock.MagicMock()
     return FBIP
 
 
 @pytest.fixture
-def FakeBigIPWithPort():
+def FakeBigIPWithPort(fakeicontrolsession):
     FBIP = BigIP('FakeHostName', 'admin', 'admin', port='10443')
     FBIP.icontrol = mock.MagicMock()
     return FBIP
diff --git a/f5/bigip/tm/auth/test/test_user.py b/f5/bigip/tm/auth/test/test_user.py
index 186502e7f..2208bbb75 100644
--- a/f5/bigip/tm/auth/test/test_user.py
+++ b/f5/bigip/tm/auth/test/test_user.py
@@ -29,7 +29,7 @@ def FakeUser():
 
 
 class TestCreate(object):
-    def test_create_two(self):
+    def test_create_two(self, fakeicontrolsession):
         b = BigIP('localhost', 'admin', 'admin')
         n1 = b.auth.users.user
         n2 = b.auth.users.user
diff --git a/f5/bigip/tm/cm/test/test___init__.py b/f5/bigip/tm/cm/test/test___init__.py
index 6a69fc3e9..ee901c432 100644
--- a/f5/bigip/tm/cm/test/test___init__.py
+++ b/f5/bigip/tm/cm/test/test___init__.py
@@ -20,7 +20,7 @@
 
 
 @pytest.fixture
-def FakeiControl():
+def FakeiControl(fakeicontrolsession):
     bigip = BigIP('host', 'fake_admin', 'fake_admin')
     mock_session = mock.MagicMock()
     mock_session.post.return_value.json.return_value = {}
diff --git a/f5/bigip/tm/cm/trust.py b/f5/bigip/tm/cm/trust.py
index b3c7a387f..45690b498 100644
--- a/f5/bigip/tm/cm/trust.py
+++ b/f5/bigip/tm/cm/trust.py
@@ -38,6 +38,7 @@ def __init__(self, cm):
         self._meta_data['required_json_kind'] = \
             'tm:cm:add-to-trust:runstate'
         self._meta_data['allowed_commands'].append('run')
+        self._meta_data['supported_versions'].discard('11.6.0')
 
 
 class Remove_From_Trust(UnnamedResourceMixin, CommandExecutionMixin, Resource):
@@ -59,3 +60,4 @@ def __init__(self, cm):
         self._meta_data['required_json_kind'] = \
             'tm:cm:remove-from-trust:runstate'
         self._meta_data['allowed_commands'].append('run')
+        self._meta_data['supported_versions'].discard('11.6.0')
diff --git a/f5/bigip/tm/ltm/profile.py b/f5/bigip/tm/ltm/profile.py
index c5e2d1684..49c644890 100644
--- a/f5/bigip/tm/ltm/profile.py
+++ b/f5/bigip/tm/ltm/profile.py
@@ -511,6 +511,7 @@ def __init__(self, profile):
         self._meta_data['allowed_lazy_attributes'] = [Iiop]
         self._meta_data['attribute_registry'] = \
             {'tm:ltm:profile:iiop:iiopstate': Iiop}
+        self._meta_data['supported_versions'].discard('11.6.0')
 
 
 class Iiop(Resource):
@@ -1034,6 +1035,7 @@ def __init__(self, profile):
         self._meta_data['allowed_lazy_attributes'] = [Tftp]
         self._meta_data['attribute_registry'] = \
             {'tm:ltm:profile:tftp:tftpstate': Tftp}
+        self._meta_data['supported_versions'].discard('11.6.0')
 
 
 class Tftp(Resource):
diff --git a/f5/bigip/tm/ltm/test/test_nat.py b/f5/bigip/tm/ltm/test/test_nat.py
index d33344798..f0e498350 100644
--- a/f5/bigip/tm/ltm/test/test_nat.py
+++ b/f5/bigip/tm/ltm/test/test_nat.py
@@ -29,7 +29,7 @@ def FakeNat():
 
 
 class TestCreate(object):
-    def test_create_two(self):
+    def test_create_two(self, fakeicontrolsession):
         b = BigIP('192.168.1.1', 'admin', 'admin')
         n1 = b.ltm.nats.nat
         n2 = b.ltm.nats.nat
diff --git a/f5/bigip/tm/ltm/test/test_rule.py b/f5/bigip/tm/ltm/test/test_rule.py
index b597cb196..21b685ff4 100644
--- a/f5/bigip/tm/ltm/test/test_rule.py
+++ b/f5/bigip/tm/ltm/test/test_rule.py
@@ -29,7 +29,7 @@ def FakeRule():
 
 
 class TestCreate(object):
-    def test_create_two(self):
+    def test_create_two(self, fakeicontrolsession):
         b = BigIP('192.168.1.1', 'admin', 'admin')
         r1 = b.ltm.rules.rule
         r2 = b.ltm.rules.rule
diff --git a/f5/bigip/tm/sys/test/test_db.py b/f5/bigip/tm/sys/test/test_db.py
index 2058e81ff..a1c173855 100644
--- a/f5/bigip/tm/sys/test/test_db.py
+++ b/f5/bigip/tm/sys/test/test_db.py
@@ -22,12 +22,15 @@
 @pytest.fixture
 def fake_dbs():
     fake_sys = mock.MagicMock()
-    return Dbs(fake_sys)
+    dbs = Dbs(fake_sys)
+    dbs._meta_data['bigip'].tmos_version = '11.6.0'
+    return dbs
 
 
 class TestDb(object):
     def test_create_raises(self):
         dbs = fake_dbs()
+        print(dbs.raw)
         db = dbs.db
         with pytest.raises(UnsupportedOperation):
             db.create()
diff --git a/f5/bigip/tm/sys/test/test_folder.py b/f5/bigip/tm/sys/test/test_folder.py
index 248b5d16a..7c60775fd 100644
--- a/f5/bigip/tm/sys/test/test_folder.py
+++ b/f5/bigip/tm/sys/test/test_folder.py
@@ -23,7 +23,9 @@
 @pytest.fixture
 def FakeFolders():
     fake_sys = mock.MagicMock()
-    return Folders(fake_sys)
+    folders = Folders(fake_sys)
+    folders._meta_data['bigip'].tmos_version = '11.6.0'
+    return folders
 
 
 class TestFolder(object):
diff --git a/f5/bigip/tm/sys/test/test_performance.py b/f5/bigip/tm/sys/test/test_performance.py
index b89db31ce..ab820a335 100644
--- a/f5/bigip/tm/sys/test/test_performance.py
+++ b/f5/bigip/tm/sys/test/test_performance.py
@@ -24,7 +24,9 @@
 @pytest.fixture
 def FakePerformance():
     fake_sys = mock.MagicMock()
-    return Performances(fake_sys)
+    performances = Performances(fake_sys)
+    performances._meta_data['bigip'].tmos_version = '11.6.0'
+    return performances
 
 
 class TestPerformance(object):
diff --git a/f5/bigip/tm/sys/test/test_sys_application.py b/f5/bigip/tm/sys/test/test_sys_application.py
index a60ce4fb3..84f33a431 100644
--- a/f5/bigip/tm/sys/test/test_sys_application.py
+++ b/f5/bigip/tm/sys/test/test_sys_application.py
@@ -171,7 +171,7 @@ def __init__(self):
 
 
 class TestServiceCreate(object):
-    def test_create_two(self):
+    def test_create_two(self, fakeicontrolsession):
         b = BigIP('192.168.1.1', 'admin', 'admin')
         serv1 = b.sys.applications.services.service
         serv2 = b.sys.applications.services.service
@@ -323,7 +323,7 @@ def test_update_inherit_tg_false(self, FakeService):
 
 
 class TestTemplateCreate(object):
-    def test_create_two(self):
+    def test_create_two(self, fakeicontrolsession):
         b = BigIP('192.168.1.1', 'admin', 'admin')
         templ1 = b.sys.applications.templates.template
         templ2 = b.sys.applications.templates.template
@@ -337,7 +337,7 @@ def test_create_no_args(self, FakeTemplate):
 
 
 class TestAplscript(object):
-    def test_create_two(self):
+    def test_create_two(self, fakeicontrolsession):
         b = BigIP('192.168.1.1', 'admin', 'admin')
         templ1 = b.sys.applications.aplscripts.aplscript
         templ2 = b.sys.applications.aplscripts.aplscript
@@ -350,7 +350,7 @@ def test_create_no_args(self, FakeAplscript):
 
 
 class TestCustomstat(object):
-    def test_create_two(self):
+    def test_create_two(self, fakeicontrolsession):
         b = BigIP('192.168.1.1', 'admin', 'admin')
         templ1 = b.sys.applications.customstats.customstat
         templ2 = b.sys.applications.customstats.customstat
diff --git a/f5/multi_device/cluster/test/test_cluster_manager.py b/f5/multi_device/cluster/test/test_cluster_manager.py
index bbc1b1759..dbb966003 100644
--- a/f5/multi_device/cluster/test/test_cluster_manager.py
+++ b/f5/multi_device/cluster/test/test_cluster_manager.py
@@ -30,7 +30,7 @@ def __init__(self, name):
 
 
 @pytest.fixture
-def BigIPs():
+def BigIPs(fakeicontrolsession):
     mock_bigips = []
     for bigip in range(4):
         mock_bigips.append(ManagementRoot('test', 'un', 'pw'))