diff --git a/School/Analyse/Layers/3. Network Layer.md b/School/Analyse/Layers/3. Network Layer.md
index a59067e..1800dfd 100644
--- a/School/Analyse/Layers/3. Network Layer.md	
+++ b/School/Analyse/Layers/3. Network Layer.md	
@@ -78,4 +78,13 @@ The most commonly used routing algorithms are:
 - Link-state Routing (OSPF, IS-IS)
 
 ## Addressing problem
+We now do have a addressing issue because:
+ - We have a MAC Address but we do not have a Network ID or host ID. Which is what we need for our routers.
+ - MAC addresses are hardwired in the NIC's
+
+So we need a new type of ID to uniquely identify a host in the internet.
+
+This address will we at a higher level of protocols 
+
+