diff --git a/.obsidian/community-plugins.json b/.obsidian/community-plugins.json
index 0b66978..5306326 100644
--- a/.obsidian/community-plugins.json
+++ b/.obsidian/community-plugins.json
@@ -19,5 +19,7 @@
   "obsidian-completr",
   "execute-code",
   "nldates-obsidian",
-  "obsidian-livesync"
+  "obsidian-livesync",
+  "obsidian-dynamic-toc",
+  "obsidian-excalidraw-plugin"
 ]
\ No newline at end of file
diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index e517f85..a57f1f3 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -15,7 +15,7 @@
               "type": "markdown",
               "state": {
                 "file": "Informationssicherheit/Ueb2/Ueb2.md",
-                "mode": "source",
+                "mode": "preview",
                 "source": false
               }
             }
@@ -189,6 +189,9 @@
   },
   "left-ribbon": {
     "hiddenItems": {
+      "obsidian-excalidraw-plugin:Create new drawing": false,
+      "obsidian-livesync:Replicate": false,
+      "obsidian-livesync:Show log": false,
       "switcher:Open quick switcher": false,
       "graph:Open graph view": false,
       "canvas:Create new canvas": false,
@@ -196,14 +199,13 @@
       "templates:Insert template": false,
       "command-palette:Open command palette": false,
       "table-editor-obsidian:Advanced Tables Toolbar": false,
-      "obsidian-livesync:Replicate": false,
-      "obsidian-livesync:Show log": false,
       "obsidian-advanced-slides:Show Slide Preview": false,
       "juggl:Juggl global graph": false
     }
   },
   "active": "e2194e3299515374",
   "lastOpenFiles": [
+    "CCN/Ex01",
     "Informationssicherheit/Ueb2/Ueb2.pdf",
     "Informationssicherheit/Ueb2/02-ueb_uebungsblatt.pdf",
     "Informationssicherheit/Ueb2/Ueb2.md",
@@ -238,7 +240,6 @@
     "2023-04-16.md",
     "Informationssicherheit/Ueb1",
     "Informationssicherheit/VL",
-    "CCN",
     "FH/2023-04-16.md",
     "FH/Informationssicherheit/Ueb1/Ueb01.md",
     "FH/Informationssicherheit/Ueb01.md",
diff --git a/CCN/Ex01/ccn1-exercise1.pdf b/CCN/Ex01/ccn1-exercise1.pdf
new file mode 100644
index 0000000..b340c51
Binary files /dev/null and b/CCN/Ex01/ccn1-exercise1.pdf differ