Routing Guide for CCNA

The 640-802 Cisco Certified Network Associate (CCNA) is the composite exam associated with the Cisco Certified Network Associate certification. 
This exam tests a candidate's knowledge and skills required to install, operate, and troubleshoot a small to medium size enterprise branch network. The topics include connecting to a WAN; implementing network security; network types; network media; routing and switching fundamentals; the TCP/IP and OSI models; IP addressing; WAN technologies; operating and configuring IOS devices; extending switched networks with VLANs; determining IP routes; managing IP traffic with access lists; establishing point-to-point connections; and establishing Frame Relay connections. Course covers: Describe how a network works; Configure, verify and troubleshoot a switch with VLANs and interswitch communications; Implement an IP addressing scheme and IP Services to meet network requirements in a medium-size Enterprise branch office network.; Configure, verify, and troubleshoot basic router operation and routing on Cisco devices; Explain and select the appropriate administrative tasks required for a WLAN; Identify security threats to a network and describe general methods to mitigate those threats; Implement, verify, and troubleshoot NAT and ACLs in a medium-size Enterprise branch office network; Implement and verify WAN links.
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This free tutorial can be used to study for the CCNA, and it can also be used by anyone who wants to learn about computer networks in general.
You can also find CCNA Practise lab.