Update docs/tech_docs/CCNA-exam-prep.md

docs/tech_docs/CCNA-exam-prep.md

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 - Study Plan Guidelines
 
 ## Part I: Introduction to Networking
+# CCNA 200-301 Official Cert Guide, Volume 1 - Study Reference
+
+## Part I: Introduction to Networking
+
 ### Chapter 1: Introduction to TCP/IP Networking
+- **"Do I Know This Already?" Quiz**
+- **Foundation Topics**
+  - Perspectives on Networking
+  - TCP/IP Networking Model
+    - History Leading to TCP/IP
+    - Overview of the TCP/IP Networking Model
+  - TCP/IP Application Layer
+    - HTTP Overview
+    - HTTP Protocol Mechanisms
+  - TCP/IP Transport Layer
+    - TCP Error Recovery Basics
+    - Same-Layer and Adjacent-Layer Interactions
+  - TCP/IP Network Layer
+    - Internet Protocol and the Postal Service
+    - Internet Protocol Addressing Basics
+    - IP Routing Basics
+  - TCP/IP Data-Link and Physical Layers
+    - Data Encapsulation Terminology
+    - Names of TCP/IP Messages
+  - OSI Networking Model and Terminology
+    - Comparing OSI and TCP/IP Layer Names and Numbers
+    - OSI Data Encapsulation Terminology
+- **Chapter Review**
+
 ### Chapter 2: Fundamentals of Ethernet LANs
+- **"Do I Know This Already?" Quiz**
+- **Foundation Topics**
+  - An Overview of LANs
+    - Typical SOHO LANs
+    - Typical Enterprise LANs
+  - The Variety of Ethernet Physical Layer Standards
+  - Consistent Behavior over All Links Using the Ethernet Data-Link Layer
+  - Building Physical Ethernet LANs with UTP
+    - Transmitting Data Using Twisted Pairs
+    - Breaking Down a UTP Ethernet Link
+    - UTP Cabling Pinouts for 10BASE-T and 100BASE-T
+    - Straight-Through Cable Pinout
+    - Choosing the Right Cable Pinouts
+    - UTP Cabling Pinouts for 1000BASE-T
+  - Building Physical Ethernet LANs with Fiber
+    - Fiber Cabling Transmission Concepts
+    - Using Fiber with Ethernet
+  - Sending Data in Ethernet Networks
+    - Ethernet Data-Link Protocols
+    - Ethernet Addressing
+    - Identifying Network Layer Protocols with the Ethernet Type Field
+    - Error Detection with FCS
+  - Sending Ethernet Frames with Switches and Hubs
+    - Sending in Modern Ethernet LANs Using Full Duplex
+    - Using Half Duplex with LAN Hubs
+- **Chapter Review**
+
 ### Chapter 3: Fundamentals of WANs and IP Routing
 - **Part I Review**