Cisco IOS images for GNS3

Found this link for huge collection of IOS images specifically for GNS3. 

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CCNA Data Center - Introducing Cisco Data Center Networking Study Guide

A must-have study guide for exam 640-911 on Cisco's Unified Data Center

The Cisco Certified Network Associate Data Center certification is Cisco's newest certification, covering the Cisco Unified Data Center technologies. Written by unparalleled author and Cisco authority Todd Lammle, and CCIE John Swartz, this comprehensive study guide is essential reading for anyone preparing to take the 640-911 exam (Introducing Cisco Data Center Networking), providing in-depth coverage of all the exam's objectives. In addition, it offers expanded coverage on key topics reflected on the exam.

Exam Code: 640-911

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