Cisco CCNA 2 - Page 237

236 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Appendix B Copyright © 2004, Cisco Systems, Inc.
Web Links
Certification Magazine: http://www.certmag.com/issues/aug01/feature_long.cfm
CCIE: http://www.cisco.com/warp/public/625/ccie/