Exploration network chapter5

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Exploration network chapter5

  1. 1. OSI Network Layer Network Fundamentals – Chapter 5 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  2. 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 network © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  3. 3. Network Layer Protocols and Internet Protocol (IP)  Define the basic role of the Network Layer in data networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  4. 4. Network Layer Protocols and Internet Protocol (IP)  Identify the basic characteristics and the role of the IPv4 protocol © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  5. 5. Network Layer Protocols and Internet Protocol (IP)  Describe the implications for the use of the IP protocol as it is connectionless © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  6. 6. Network Layer Protocols and Internet Protocol (IP)  Describe the implications for the use of the IP protocol as it is considered an unreliable protocol © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  7. 7. Network Layer Protocols and Internet Protocol (IP)  Describe the implications for the use of the IP as it is media independent © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  8. 8. Network Layer Protocols and Internet Protocol (IP)  Describe the role of framing in the Transport Layer and explain that segments are encapsulated as packets © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  9. 9. Network Layer Protocols and Internet Protocol (IP)  Identify the major header fields in the IPv4 protocol and describe each field's role in transporting packets © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  10. 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-networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  11. 11. Grouping Devices into Networks and Hierarchical Addressing  List several ways in which dividing a large network can increase network performance © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  12. 12. Grouping Devices into Networks and Hierarchical Addressing  List several ways in which dividing a large network can increase network security © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  13. 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 network © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  14. 14. Grouping Devices into Networks and Hierarchical Addressing  Describe how hierarchical addressing solves the problem of devices communicating across networks of networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  15. 15. Grouping Devices into Networks and Hierarchical Addressing  Describe the purpose of further subdividing networks into smaller networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  16. 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 networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  17. 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-network © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  18. 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 destinations © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  19. 19. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Define a route and its three key parts © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  20. 20. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Describe the purpose and use of the destination network in a route © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 20
  21. 21. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Describe the purpose and use of the next hop in a route © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 21
  22. 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 networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 22
  23. 23. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Describe the purpose of routing protocols and the need for both static and dynamic routes © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 23
  24. 24. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Explain how routes are manually configured to build routing table © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 24
  25. 25. Fundamentals of Routes, Next Hop Addresses and Packet Forwarding  Explain the role of routing protocols in building the routing table © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 25
  26. 26. Summary © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 26
  27. 27. © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 27

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