Front cover IBM Certification Study Guide - AIX 5L Communications Developed specifically for the purpose of preparing for AIX certification Makes an excellent companion to classroom education For experienced AIX professionals Tim Dasgupta Stephen Sommer ibm.com/redbooks International Technical Support Organization IBM ^ Certification Study Guide - AIX 5L Communications December 2002 SG24-6186-01 Note: Before using this information and the product it supports, read the information in “Notices” on page xiii. Second Edition (December 2002) This edition applies to AIX 5L Version 5.1 (5765-E61) and subsequent releases running on an IBM ^ pSeries or RS/6000 server. This document was updated on January 6, 2004. © Copyright International Business Machines Corporation 2000, 2002. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Figures . ix Tables . xi Notices . xiii Trademarks . xiv Preface . xv The team that wrote this redbook. xvi Become a published author . xvii Comments welcome. xviii Chapter 1. Certification overview . 1 1.1 Certification requirements . 2 1.1.1 Required prerequisite . 2 1.1.2 Recommended prerequisite . 2 1.1.3 Information and registration for the certification exam . 2 1.1.4 Core requirements . 2 1.2 Certification education courses . 7 Chapter 2. Network interfaces and protocols . 9 2.1 Networking basics . 10 2.2 Ethernet standards overview. 11 2.2.1 Access method . 12 2.2.2 Fast Ethernet. 13 2.2.3 Gigabit Ethernet . 13 2.3 Asynchronous Transfer Mode (ATM) . 13 2.3.1 TCP/IP over ATM . 14 2.4 Network media . 15 2.5 Ethernet frame types . 18 2.6 Hubs, bridges, switches, and routers . 19 2.7 Network protocols . 21 2.7.1 Protocol summary . 24 2.8 Networking hardware . 24 2.8.1 Network adapters . 25 2.8.2 Network drivers . 30 2.9 AIX network interfaces . 31 2.10 Quiz . 33 2.10.1 Answers . 39 © Copyright IBM Corp. 2000, 2002. All rights reserved. iii 2.11 Exercises. 39 Chapter 3. Network addressing and routing. 41 3.1 Internet addressing . 42 3.1.1 IP address format . 42 3.1.2 Internet address classes . 43 3.1.3 Special Internet addresses . 45 3.1.4 Subnetting . 47 3.1.5 Supernetting . 53 3.1.6 Address Resolution Protocol (ARP) . 54 3.2 Routing . 55 3.2.1 An introduction to static and dynamic routing . 56 3.2.2 Static routing . 57 3.2.3 Dynamic routing . 61 3.2.4 ICMP redirects . 64 3.2.5 Routing debugging . 66 3.3 Command summary . 68 3.3.1 The ifconfig command. 68 3.3.2 The netstat command . 68 3.3.3 The route command . 69 3.3.4 The chdev command. 70 3.3.5 The lsattr command . 70 3.4 Quiz . 71 3.4.1 Answers . 76 3.5 Exercises. 76 Chapter 4. Basic network administration . 79 4.1 Network administration using SMIT. 80 4.1.1 Minimum configuration . 80 4.1.2 Further TCP/IP configuration . 81 4.1.3 Setting the host name . 83 4.1.4 Host name resolution . 83 4.1.5 Network interface configuration. 86 4.1.6 The prtconf command . 88 4.1.7 The TTY configuration. 90 4.1.8 Asynchronous Terminal Emulation . 91 4.1.9 EtherChannel . 93 4.2 Configuring network attributes. 96 4.3 Securing network services . 98 4.3.1 The r-commands . 100 4.3.2 The telnet service . 102 4.3.3 The FTP service . 103 4.4 Command summary . 103 iv IBM ^ Certification Study Guide - AIX 5L Communications 4.4.1 The lsattr command . 103 4.4.2 The chdev command. 104 4.5 Quiz . 105 4.5.1 Answers . 108 4.6 Exercises. 108.