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MyNFChapter5

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  • 1. OSI Network Layer Network Fundamentals – Chapter 5ITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  • 2. Objectives  Identify the role of the Network Layer, as it describes communication from one end device to another end device  Examine the most common Network Layer protocol, Internet Protocol (IP), and its features for providing connectionless and best-effort service  Understand the principles used to guide the division or grouping of devices into networks  Understand the hierarchical addressing of devices and how this allows communication between networks  Understand the fundamentals of routes, next hop addresses and packet forwarding to a destination networkITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  • 3. Network Layer Protocols and Internet Protocol (IP)  Define the basic role of the Network Layer in data networksITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  • 4. Network Layer Protocols and Internet Protocol (IP)  Identify the basic characteristics and the role of the IPv4 protocolITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  • 5. Network Layer Protocols and Internet Protocol (IP)  Describe the implications for the use of the IP protocol as it is connectionlessITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  • 6. Network Layer Protocols and Internet Protocol (IP)  Describe the implications for the use of the IP protocol as it is considered an unreliable protocolITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  • 7. Network Layer Protocols and Internet Protocol (IP)  Describe the implications for the use of the IP as it is media independentITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  • 8. Network Layer Protocols and Internet Protocol (IP)  Describe the role of framing in the Transport Layer and explain that segments are encapsulated as packetsITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  • 9. Network Layer Protocols and Internet Protocol (IP)  Identify the major header fields in the IPv4 protocol and describe each fields role in transporting packetsITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  • 10. Grouping Devices into Networks and Hierarchical Addressing  List several different reasons for grouping devices into sub-networks and define several terms used to identify the sub-networksITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  • 11. Grouping Devices into Networks and Hierarchical Addressing  List several ways in which dividing a large network can increase network performanceITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  • 12. Grouping Devices into Networks and Hierarchical Addressing  List several ways in which dividing a large network can increase network securityITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  • 13. Grouping Devices into Networks and Hierarchical Addressing  Explain the communication problems that emerge when very large numbers of devices are included in one large networkITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  • 14. Grouping Devices into Networks and Hierarchical Addressing  Describe how hierarchical addressing solves the problem of devices communicating across networks of networksITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  • 15. Grouping Devices into Networks and Hierarchical Addressing  Describe the purpose of further subdividing networks into smaller networksITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  • 16. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Describe the role of an intermediary gateway device in allowing devices to communicate across sub-divided networksITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  • 17. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Trace the steps of an IP packet as it traverses unchanged via routers from sub network to sub-networkITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  • 18. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Describe the role of a gateway and the use of a simple route table in directing packets toward their ultimate destinationsITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  • 19. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Define a route and its three key partsITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  • 20. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Describe the purpose and use of the destination network in a routeITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 20
  • 21. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Describe the purpose and use of the next hop in a routeITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 21
  • 22. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Trace the steps of several IP packets as they are routed through several gateways from devices on one sub network to devices on other sub networksITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 22
  • 23. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Describe the purpose of routing protocols and the need for both static and dynamic routesITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 23
  • 24. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Explain how routes are manually configured to build routing tableITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 24
  • 25. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Explain the role of routing protocols in building the routing tableITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 25
  • 26. SummaryITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 26
  • 27. ITE PC v4.0Chapter 1 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 27