CCNA is the most commonly-held Cisco certification and indicates apprentice knowledge of networking. CCNA certifies users to install, configure, and operate Cisco products.
A CCNA candidate must prove familiarity and expertise with, among other subjects, Cisco's IOS, TCP/IP, LAN and WAN technologies and management, switching and routing protocols, the OSI model, LAN troubleshooting, and be familiar with a variety of communication protocols, some Cisco-specific and some not.
Authorized training is provided globally by Cisco Learning Partners. Also available are self-study guide by Cisco Press. Addtional resources and tools to aid in preparing for the certification are available on the CCNA Prep Center.
Here are some ebook for CCNA
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