Mandrake Corporate Server 2.1 firewall&security

hello, is Mandrake Corporate Server 2.1 os are fully firewalled&secured? and also from dos attacks? or does it reqiure additional firewall software?, and if it require, is there any free good firewall,security&monitoring software available for download for linux?

im asking this cuz i saw in that os features the "Firewall and router -- security and Internet sharing" is this the server firewall or something else?

 

 

 

 

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