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 | | CCNA Cisco certified network associate by Todd Lammle, Donald Porter, James Chellis 516 Pages, Published 2000 ISBN-13: 978-7-5053-6125-6, ISBN: 7-5053-6125-2 |
 | | CCNA Cisco certified network associate study guide by Syngress Media Inc, Todd Lammle, Donald Porter, James Chellis, 美国西格瑞斯·梅地亚公司 579 Pages, Published 1999 ISBN-13: 978-7-111-07287-4, ISBN: 7-111-07287-1 |
 | | CCDA Cisco Certified Design Associate 学习指南/CCDA:Cisco Certified Design Associate Study Guide/学习指南系列 by Todd Lammle, Donald Porter, James Chellis 435 Pages, Published 1999 ISBN-13: 978-7-5053-5369-5, ISBN: 7-5053-5369-1 |
 | | CCNA Cisco Certified Network Associate学习指南/英文原版/CCNA学习指南系列/CCNA:Cisco Certified Network Associate study guide: 英文原版 by Todd Lammle, T.·莱姆勒, Donald Porter, James Chellis 539 Pages, Published 1999 ISBN-13: 978-7-5053-5368-8, ISBN: 7-5053-5368-3 |
Donald Porter