I presume you use SUSE 10.2 as a desktop. "Better safe than sorry" is an extremely underrated maxim. You do need a firewall, anti-virus and anti-spyware for Linux. While the incidence of viruses and spyware on Linux are considerably smaller than on Windows-based platforms, they still can occur. Additionally, a properly configured firewall will help protect your host from attackers attempting to compromise it.
With SUSE 10.2 you have the added advantage that Novell bundles anti-virus, firewall, anti-spyware and anti-spam packages with 10.2 - you can see the exact applications. I recommend you refer to the SUSE documentation to see how to enable and configure these applications.
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