1. 12 September 2015 CCENT 640-822 ICND1 Exam Topics Review TCP/IP and OSI Networking Models

2. 12 September 2015 Disclaimer  This review is for the exclusive non-profit use by Cisco Academy instructors and students only!  Contents of this review were derived from the following sources under the doctrine of US copyright “Fair Use” section 107: Cisco Networking Academy Curricula: Discovery Networking for Home and Small Businesses version 4.x Interactive Course Guide, Cisco Learning Institute CCENT/CCNA ICND 1 Official Exam Certification Guide, 2 nd ed. by Wendell Odom, Cisco Press, 2008; ISBN1-58720-182-2 Cisco Learning Network https://learningnetwork.cisco.com/docs/DOC-4987 https://learningnetwork.cisco.com/docs/DOC-4987 Other references footnoted in individual slide notes area.

3. 12 September 2015 Error Reporting  Please report any errors in this presentation to:  remeyers@mail.wvu.edu remeyers@mail.wvu.edu  Don’t rant! Let me know where I made a mistake so it can be fixed.  Feel free to add, subtract, modify, this presentation with the request that the WVU master and my name be removed from your results.

4. 12 September 2015 CCENT Exam Topics  Describe the operation of data networks  Use the OSI and TCP/IP models and their associated protocols to explain how data flows in a network  Describe the purpose and basic operation of the protocols in the OSI and TCP models https://learningnetwork.cisco.com/docs/DOC-4987

5. 12 September 2015 TCP/IP Protocol Architecture  The TCP/IP model is a description framework for computer network protocols created in the 1970s by the US Department of Defense. 1  It describes a set of general design guidelines and implementations of specific networking protocols to enable computers to communicate over a network. 2

6. 12 September 2015 TCP/IP Protocol Architecture

7. 12 September 2015 TCP/IP Application Layer  Defines and provides services to the PC application software, such as browser requests for web page file transfers  HTTP – request and response  HTML – to properly read and display received file

8. 12 September 2015 TCP/IP Transport Layer  Provides the Application layer with communication session and datagram services  Transport Control Protocol: One-to-one, connection- oriented, reliable, error free delivery of data.  User Datagram Protocol: Connectionless, unreliable data delivery

9. 12 September 2015 TCP/IP Internet Layer  Responsible for addressing, packaging, and routing functions.  Internet Protocol Hierarchical IP addressing of networks and hosts Packet routing by transferring data from router to router.

10. 12 September 2015 TCP/IP Network Addressing Layer  Defines protocols and hardware required to deliver data across a physical network.  Serves the Internet layer by encapsulating data with appropriate framing for the physical network.

11. 12 September 2015 Data Encapsulation  Data is “wrapped” with protocol information at each layer of the TCP/IP model when a host transmits data to another device across a network

12. 12 September 2015 Data Encapsulation Example in TCP/IP  Application  Data from browser gets an HTTP header  Transport  HTTP request is segmented with each segment getting a port and sequence number.  Internet  Each TCP segment gets an IP address header and becomes a packet.  Network Access  Each IP packet gets a frame header and trailer including frame check sum error information.  Data bits encoded for proper physical delivery; copper, fiber, wireless

13. 12 September 2015 Data Encapsulation Terms in TCP/IP

14. 12 September 2015 Data Encapsulation Example in TCP/IP

15. 12 September 2015 OSI Reference Model  The Open Systems Interconnect Model was developed by the International Organization for Standardization (ISO) in 1984  7 layer model

16. 12 September 2015 OSI Layering Concepts and Benefits  Less complex and easier to learn  Breaks concepts into smaller easier to explain parts  Standard Interfaces  Vendor neutral for open development  Multi-vendor interoperability of applications & devices  Modular engineering  Applications and hardware device development can be done at any layer

17. 12 September 2015 OSI Reference Model

18. 12 September 2015 OSI Protocol Data Units  PDU contains data as well as header/trailer at each layer similar to TCP/IP model

19. 12 September 2015 Data Flow Using TCP/IP & OSI Models data

20. 12 September 2015