1. IP Addressing and Application Services
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2. Multicast
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3. IP routing
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Protocols
4. IP switching and tunneling
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A. IP switching
B. IP tunneling
5. IPv6
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6. LAN switching
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Protocol groups
Chapter downloads:
7. MPLS (Multiprotocol Label Switching)
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Protocol groups
Chapter downloads:
8. Network management
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These links contain product literature, versions and options, technical documentation, alerts and bulletins, and related software centers.
9. QoS (Quality of Service)
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10. Security and VPN
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Protocol groups
Chapter downloads
11. Storage networking
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12. Voice
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Chapter downloads:
13. WAN
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Chapter download:
14. Wireless / Mobility
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15. Certifications
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Chapter downloads
16. Cisco Product Security Advisories and Notices
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Advisories and Notices
http://www.cisco.com/warp/public/707/advisory.html
17. End of product life notifications
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Cisco provides six months' notice of an affected product's end-of-sale date and/or the last day when the affected product can be ordered. You can also see the time period within that Cisco may release any software maintenance releases or bug fixes to the affected software product. After this date, Cisco Engineering will no longer develop, repair, maintain, or test the product software.
You might want to visit this site regularly.
http://www.cisco.com/en/US/products/products_end-of-life_policy.html