Martin James Duggan, CCIE No. 7942, is a network architect for AT&T. He designs network solutions for global
customers and specializes in data center networking and quality of service. Martin mentors colleagues through their
Cisco qualifications and holds regular internal training classes. Previous to this, Martin was a network architect for IBM
performing IP network de-signs and global network reviews. Martin has been in the industry for 22 years, focusing
on Cisco solutions for the past 12 years. He is the author of the Cisco Press book CCIE Routing and Switching v4.0
Configuration Practice Labs and the co-author of Routing and Switching Practice Labs Volume 1.