How to prevent DOS attacks against web servers

Can anyone provide me with the best network configuration/tools/services to prevent DOS (Denial of service) attacks.

Take for example the following scenario for a website.  
•      Website with thousands of hits per day.
•      Traffic routed to CDN.
•      Firewall between CDN and hosting company
•      Website hosted by a public hosting company
•      Web servers in a DMZ

1.      What sort of network design/configuration is recommended to reduce DOS attacks
2.      What DOS service/software/hardware is recommended?
3.   Can you guide me to some documentation on this?

Please shed some details on the above.
wademiAsked:
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lalocehCommented:
You need to implement a Network Intrussion Prevention System (NIPS) and set rules to block the IP addresses that are sending DOS attacks
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Didier VallySystems Engineer and Finance AnalystCommented:
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remixedcatCommented:
Cisco firewalls are good.
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Russell_VenableCommented:
Is this a general question about DoS or do you have something specific in mind? If your being attacked with sun flooding you can configure your TCPIP stack to to ignore incoming SYN packets, disable ICMP redirects, and change keep alive time.

The following is a example.
Windows Registery Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Paramenters]
"SynAttackProtect" =dword:00000002
"EnableICMPRedirects" =dword:00000000
"KeepAliveTime" =000493E0

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