diff --git a/.obsidian/workspace b/.obsidian/workspace
index cde62c4..ac700be 100644
--- a/.obsidian/workspace
+++ b/.obsidian/workspace
@@ -9,8 +9,8 @@
         "state": {
           "type": "markdown",
           "state": {
-            "file": "School/Analyse/Layers/3. Network Layer.md",
-            "mode": "preview"
+            "file": "School/Analyse/Network Hardware.md",
+            "mode": "source"
           }
         }
       }
@@ -68,7 +68,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "School/Analyse/Layers/3. Network Layer.md",
+                "file": "School/Analyse/Network Hardware.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -87,12 +87,12 @@
   },
   "active": "bc6e8ad9aa0f44c3",
   "lastOpenFiles": [
+    "School/Analyse/Network Hardware.md",
     "School/Analyse/Layers/3. Network Layer.md",
     "School/Analyse/Layers/2. Datalink Layer.md",
     "School/Analyse/Network Types.md",
     "School/Analyse/Network Software.md",
     "School/Analyse/Computer Networks.md",
-    "School/Analyse/Network Hardware.md",
     "School/Analyse/Images/distortion.png",
     "School/Analyse/Images/noise-signal.png",
     "README.md",
diff --git a/School/Analyse/Network Hardware.md b/School/Analyse/Network Hardware.md
index 21b3932..0af9273 100644
--- a/School/Analyse/Network Hardware.md	
+++ b/School/Analyse/Network Hardware.md	
@@ -21,4 +21,10 @@ They read the frame of a incoming message, extract the destination MAC Address a
 
 
 ## Routers
+Router is a member of multiple networks.
+For each connection to a network a routers uses a network interface card (NIC) and a IP address.
+
+This way a router can have multiple IP addresses.
+
+