diff --git a/libp2p/__init__.py b/libp2p/__init__.py
index 2e1cf88..38a285a 100644
--- a/libp2p/__init__.py
+++ b/libp2p/__init__.py
@@ -67,16 +67,18 @@ def initialize_default_swarm(
     if not id_opt:
         id_opt = generate_id()
 
+    # TODO parse transport_opt to determine transport
     transport_opt = transport_opt or ["/ip4/127.0.0.1/tcp/8001"]
-    transport = [multiaddr.Multiaddr(t) for t in transport_opt]
-    # TODO wire muxer up with swarm
-    # muxer = muxer_opt or ["mplex/6.7.0"]
+    transport = TCP()
+
+    # TODO TransportUpgrader is not doing anything really
+    # TODO parse muxer and sec to pass into TransportUpgrader
+    muxer = muxer_opt or ["mplex/6.7.0"]
     sec = sec_opt or ["secio"]
+    upgrader = TransportUpgrader(sec, muxer)
+
     peerstore = peerstore_opt or PeerStore()
-    upgrader = TransportUpgrader(sec, transport)
-    swarm_opt = Swarm(id_opt, peerstore, upgrader)
-    tcp = TCP()
-    swarm_opt.add_transport(tcp)
+    swarm_opt = Swarm(id_opt, peerstore, upgrader, transport)
 
     return swarm_opt
 
diff --git a/libp2p/network/swarm.py b/libp2p/network/swarm.py
index b30567b..ff62c52 100644
--- a/libp2p/network/swarm.py
+++ b/libp2p/network/swarm.py
@@ -12,14 +12,14 @@ from .connection.raw_connection import RawConnection
 class Swarm(INetwork):
     # pylint: disable=too-many-instance-attributes, cell-var-from-loop
 
-    def __init__(self, peer_id, peerstore, upgrader):
+    def __init__(self, peer_id, peerstore, upgrader, transport):
         self.self_id = peer_id
         self.peerstore = peerstore
         self.upgrader = upgrader
+        self.transport = transport
         self.connections = dict()
         self.listeners = dict()
         self.stream_handlers = dict()
-        self.transport = None
 
         # Protocol muxing
         self.multiselect = Multiselect()
@@ -183,10 +183,6 @@ class Swarm(INetwork):
             return True
         return False
 
-    def add_transport(self, transport):
-        # TODO: Support more than one transport
-        self.transport = transport
-
 def create_generic_protocol_handler(swarm):
     """
     Create a generic protocol handler from the given swarm. We use swarm