Targeting JNCIA - Targeting JNCIA Overview The explosive growth in packet switched computer networks

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  • Targeting JNCIA

    Study Guide for Exam JN0-201

    By

    Jeffrey Ringwelski, John Jacobs, Tyler Wessels

  • This book is a work of non-fiction. Names and places have been changed to protect the privacy of all individuals. The events and situations are true.

    © 2003 by Jeffrey Ringwelski, John Jacobs, Tyler Wessels. All rights reserved.

    No part of this book may be reproduced, stored in a retrieval system, or

    transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without written permission from the author.

    ISBN: 1-4107-6496-6 (e-book)

    ISBN: 1-4107-6495-8 (Paperback)

    Library of Congress Control Number: 2003094108

    This book is printed on acid free paper.

    Printed in the United States of America Bloomington, IN

    1stBooks - rev. 07/28/03

  • iii

    Acknowledgements

    The authors would like to thank, in no particular order of

    appreciation: Evan Mennillo for his great work and continued attention to detail.

    Max Gabriel and Brandon Gaither for feedback and assistance. All those who contributed, in their own way, to a project that ended

    up a bit more complex than originally thought.

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  • v

    Contents

    TARGETING JNCIA ............................................................. 3

    OVERVIEW........................................................................................ 3 INTRODUCTION ................................................................................. 3

    Objective ...................................................................................... 4 Using this Book............................................................................ 5

    BASICS .................................................................................. 9

    THE INTERNET .................................................................................. 9 IP ADDRESSING .............................................................................. 10 IP SUBNETTING .............................................................................. 12 KEY POINTS.................................................................................... 16 RFC................................................................................................ 16

    CHAPTER 2: HARDWARE............................................ 19 OVERVIEW...................................................................................... 19 INTRODUCTION ............................................................................... 19 M-SERIES ROUTING ENGINE (RE)................................................... 20 M-SERIES PACKET-FORWARDING ENGINE (PFE)............................ 21

    M-series PICs & FPCs........................................................ 21 M-series PFE ASICs..................................................................... 22

    M160 OVERVIEW ........................................................................... 24 M160 Chassis .............................................................................. 24 M160 Flexible PIC Concentrator (FPC) ........................................ 25 M160 Switching & Forwarding Modules (SFMs)............................ 26 M160 Packet Flow ....................................................................... 27 The following steps walk through packet on a M160 router:............ 27 Physical Interface Cards (PICs) .................................................... 28 M160 PFE Clock Generators (PCGs) ............................................ 28 M160 Host Module....................................................................... 29 M160 Miscellaneous Control Subsystem (MCS) ............................. 29 M40e Overview...................................................................... 29

    M40 OVERVIEW ............................................................................. 29 M40 Backplane ............................................................................ 31

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    M40 System Control Board (SCB) ................................................. 31 M40 Packet Flow ......................................................................... 32

    M20 OVERVIEW ............................................................................. 33 M20 Packet Forwarding Engine .................................................... 34 FPCs ........................................................................................... 34

    M-5/M-10 OVERVIEW .................................................................... 34 M5/M10 PFE ............................................................................... 35

    KEY POINTS .................................................................................... 37

    CHAPTER 3: JUNOS..........................................................43

    OVERVIEW ...................................................................................... 43 INTRODUCTION ............................................................................... 43 BOOT PROCESS ............................................................................... 44 PROCESSES (DAEMONS) .................................................................. 44 COMMAND LINE INTERFACE (CLI) ................................................. 45

    Operational Mode ........................................................................ 48 Configuration Mode ..................................................................... 50 Candidate Configuration and Commit............................................ 57 Loading files ................................................................................ 58 Rollback ...................................................................................... 59

    TRACEOPTIONS ............................................................................... 60 INTRODUCTION TO ROUTING........................................................... 60 STATIC VS DYNAMIC ROUTES ......................................................... 62

    Configuring Static Routes ............................................................. 63 INTERFACE AND ROUTING-OPTIONS CONFIGURATION.................... 64

    Interface Configuration................................................................. 64 Configuring Routing-Options ........................................................ 68

    KEY POINTS .................................................................................... 69

    CHAPTER 4: RIP ................................................................73

    OVERVIEW ...................................................................................... 73 INTRODUCTION ............................................................................... 73 PROTOCOL FUNDAMENTALS ........................................................... 74 VERSION 1 VS. VERSION 2 .............................................................. 74 COMMUNICATION BETWEEN RIP HOSTS ......................................... 75 RIP PACKETS.................................................................................. 78 CONTROLLING ROUTING UPDATES .................................................. 79 CONFIGURATION............................................................................. 81

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    Send Compatibility Parameter Configured via ‘send X’........... 82 Receive Compatibility Parameter Configured via ‘receive Y’ .. 82

    POLICY IN RIP ................................................................................ 83 MONITORING RIP IN JUNOS.......................................................... 84 KEY POINTS.................................................................................... 86 ADDITIONAL INFORMATION............................................................ 86

    CHAPTER 5: OSPF............................................................. 89

    OVERVIEW...................................................................................... 89 INTRODUCTION ............................................................................... 89 ADJACENCIES ................................................................................. 91

    Hello Protocol ............................................................................. 91 Network Types ........................................................................... 93 Multi-Access Networks and Designated Router Elections................ 96

    AREA AND ROUTER TYPES ............................................................. 96 Area 0......................................................................................... 97 Site Areas ................................................................................... 97 Communicating between Areas ................................................. 98 Types of Areas.......................................................................... 100 Virtual Links ............................................................................ 100

    LINK-STATE ADVERTISEMENTS (LSAS)........................................ 101 OSPF CONFIGURATION WITHIN JUNOS....................................... 102

    Metric....................................................................................... 104 Authentication.......................................................................... 104 Configuring OSPF Timers....................................................... 105

    POLICY IN OSPF........