diff --git a/src/config/predefined.node_config.yaml b/src/config/predefined.node_config.yaml
index 2b666ca..c5e5d13 100644
--- a/src/config/predefined.node_config.yaml
+++ b/src/config/predefined.node_config.yaml
@@ -1,4 +1,4 @@
-node:
+node_config:
   - name: n_hop
     node_img: gitlab.app.n-hop.com:5005/n-hop/bats-protocol-framework/bats_protocol:dev
     node_vols:
diff --git a/src/containernet/config.py b/src/containernet/config.py
index 20e0b6a..26ef98b 100644
--- a/src/containernet/config.py
+++ b/src/containernet/config.py
@@ -77,10 +77,10 @@ class TopologyConfig:
     json_description: Optional[str] = field(default=None)
 
 
-supported_config_keys = ["node", "topology"]
+supported_config_keys = ["node_config", "topology"]
 
 
-class INodeConfig(ABC):
+class IConfig(ABC):
     @staticmethod
     def is_supported_config_key(config_key: str):
         return config_key in supported_config_keys
@@ -88,7 +88,7 @@ def is_supported_config_key(config_key: str):
     @staticmethod
     def load_config_reference(yaml_config_file: str,
                               config_name: str, config_key: str):
-        if not INodeConfig.is_supported_config_key(config_key):
+        if not IConfig.is_supported_config_key(config_key):
             logging.error(
                 f"load_config_reference: key %s is not supported.",
                 config_key)
@@ -123,7 +123,7 @@ def load_config_reference(yaml_config_file: str,
                 f"load_config_reference: %s is not defined in %s",
                 config_name, yaml_config_file)
             return None
-        if config_key == "node":
+        if config_key == "node_config":
             return NodeConfig(**loaded_config)
         if config_key == "topology":
             return TopologyConfig(**loaded_config)
@@ -133,7 +133,7 @@ def load_config_reference(yaml_config_file: str,
     def load_yaml_config(yaml_description: str, config_key: str):
         # load it directly from the yaml_description or
         # load it from another yaml file.
-        if not INodeConfig.is_supported_config_key(config_key):
+        if not IConfig.is_supported_config_key(config_key):
             logging.error(
                 f"load_yaml_config: key %s is not supported.",
                 config_key)
@@ -142,13 +142,13 @@ def load_yaml_config(yaml_description: str, config_key: str):
         is_load_from_file = ["config_file", "config_name"]
         if all(key in yaml_description for key in is_load_from_file):
             # load from the yaml file `config_file`
-            config_data = INodeConfig.load_config_reference(
+            config_data = IConfig.load_config_reference(
                 yaml_description['config_file'],
                 yaml_description['config_name'], config_key)
         else:
             # load directly from the yaml_description
             logging.info('load_yaml_config: %s', yaml_description)
-            if config_key == "node":
+            if config_key == "node_config":
                 config_data = NodeConfig(**yaml_description)
             if config_key == "topology":
                 config_data = TopologyConfig(**yaml_description)
diff --git a/src/run_test.py b/src/run_test.py
index 7e886db..f8b1b06 100755
--- a/src/run_test.py
+++ b/src/run_test.py
@@ -9,7 +9,7 @@
 from containernet.linear_topology import LinearTopology
 from containernet.network import Network
 from containernet.config import (
-    INodeConfig, NodeConfig, TopologyConfig)
+    IConfig, NodeConfig, TopologyConfig, supported_config_keys)
 from containernet.test_suites.test import (TestType, TestConfig)
 from containernet.test_suites.test_iperf import IperfTest
 from containernet.test_suites.test_ping import PingTest
@@ -53,19 +53,26 @@ def load_test(test_yaml_file: str):
 
 
 def load_config(test_case_yaml) -> Tuple[NodeConfig, TopologyConfig]:
-    local_net_top_yaml = test_case_yaml['topology']
-    local_node_conf_yaml = test_case_yaml['node_config']
-    logging.info(f"Test: top_yaml %s, node_conf_yaml %s",
-                 local_net_top_yaml, local_node_conf_yaml)
-    if local_net_top_yaml is None or local_node_conf_yaml is None:
-        logging.error("Error: top_yaml or node_conf_yaml is None.")
-        return None, None
-    node_config = INodeConfig.load_yaml_config(local_node_conf_yaml, 'node')
-    top_config = INodeConfig.load_yaml_config(local_net_top_yaml, 'topology')
-    if top_config is None or node_config is None:
-        logging.error("Error: topology/node configuration is None.")
-        return None, None
-    return node_config, top_config
+    configs = []
+    for key in supported_config_keys:
+        if key not in test_case_yaml:
+            logging.error(
+                f"Error: missing key %s in the test case yaml.",
+                key)
+            return None, None
+        local_yaml = test_case_yaml[key]
+        logging.info(f"Test: local_yaml %s",
+                     local_yaml)
+        if local_yaml is None:
+            logging.error(f"Error: content of %s is None.", key)
+            return None, None
+        loaded_conf = IConfig.load_yaml_config(
+            local_yaml, key)
+        if loaded_conf is None:
+            logging.error("Error: loaded_conf of %s is None.", key)
+            return None, None
+        configs.append(loaded_conf)
+    return configs[0], configs[1]
 
 
 def build_topology(top_config: TopologyConfig):