Cisco Design TechNotes

Here are some Cisco Design TechNotes, they are very helpfull for network addministrator to assistant to harden Cisco IOS devices:

• Access Lists
  • Cisco Guide to Harden Cisco IOS Devices
    07/Jun/2011
  • Configuring IP Access Lists
    27/Dec/2007
• Dynamic Address Allocation and Resolution
  • BOOTP and HP Printers
    30/Sep/2008
  • Proxy ARP
    28/Jan/2008
  • Subnet Zero and the All-Ones Subnet
    10/Aug/2005
  • Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise Networks
    17/Nov/2008
  • Using One DHCP Server for Voice and Data Networks
    16/Feb/2006
• Network Address Translation (NAT)
  • How NAT Handles ICMP Fragments
    10/Aug/2005
  • How NAT Works
    29/Mar/2011
  • NAT: Local and Global Definitions
    24/Aug/2006
  • Network Address Translation Catalyst Switch Support Matrix
    05/Apr/2006

Refer to http://www.cisco.com/en/US/tech/tk648/tk361/tech_tech_notes_list.html