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    Chapter 1. Standard Internetworking Models

    Chapter 1. Standard Internetworking Models

    Objectives

    This chapter covers the following Cisco-specific objectives for the “Describe the operation of data networks” section of the 640-822 ICND1 exam:

    • Use the OSI and TCP/IP models and their associated protocols to explain how data flows in a network

    • Describe common networked applications including web applications

    • Describe the purpose and basic operation of the protocols in the OSI and TCP models

    • Determine the path between two hosts across a network

    Outline

    Introduction10
    What Is an Internetwork?10
    Types of Internetworks11
     Local Area Network (LAN)11
     Metropolitan Area Network (MAN)12
     Wide Area Network (WAN)12
     Storage Area Network (SAN)13
     Virtual Private Network (VPN)14
    Open Systems Interconnection (OSI) Model14
     Upper Layers15
     Application Layer15
     Presentation Layer17
     Session Layer18
     Lower Layers18
     Transport Layer18
     Network Layer20
     Data Link Layer21
      Media Access Control (MAC)21
      Logical Link Control (LLC)22
     Physical Layer23
     OSI Layered Communications23
    TCP/IP Model25
     Application Layer26
     Transport Layer27
      TCP27
      UDP30
     Internet Layer31
      IP31
      ICMP32
      ARP, RARP, and Proxy ARP33
     Network Interface Layer33
    Cisco 3-Layer Hierarchical Model33
     Access Layer34
     Distribution Layer35
     Core Layer35
    Chapter Summary37
     Key Terms37
    Apply Your Knowledge40
     Exercises40
     Review Questions41
     Exam Questions41
     Answers to Review Questions45
     Answers to Exam Questions47
    Suggested Readings and Resources49



      

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