Не дампы, но неплохие тесты:
www.learncisco.net/test-ccna.php?exam=100-105 (бесплатно)
https://www.alphaprep.net/Cisco/CCENT (trial)
www.boson.com/practice-exam/100-105-cisco-icnd1-cc... (trial)
Книги с кучей практических тестов:
CCENT ICND1 100–105 Exam Cram, Third Edition by Anthony Sequeira, 2016
CCENT ICND1 Study Guide, 3rd Edition by Todd Lammle, 2016
CCENT/CCNA ICND1 100-105 Official Cert Guide By Wendell Odom, 2016
CCNA Routing and Switching Practice Tests: Exam 100-105, Exam 200-105, and Exam 200-125, Jon Buhagiar, 2017