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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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