Certification Zone Study Guides by Katherine Tallis:
Firewalls
OSI Reference Model, 2nd Ed.
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Katherine Tallis is a senior WAN Engineer with Lockheed Martin Corporation.
While working as a graduate student in Psychology she started writing
statistical programs for mainframe computers and eventually migrated into
technical support and consulting.
She has spent more than 15 years working in Federal and private industry on
networks ranging from a single office with a handful of devices, to global
WANs with hundreds of routers, Novell servers, and workstations.
Katherine has completed her CCNA, CCNP, and Cisco Security Specialist
certifications and is currently working on her CCIE.
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